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  • Ketola, Sirpa (Helsingin yliopisto, 2014)
    Vertigo and dizziness are among the most frequent complaints in primary care. The symptoms are usually self-limited, and the clinical course is benign, with full recovery. In many cases, however, vertigo and dizzy spells recur, leading to impairment and chronic outcome. A number of studies have documented a high prevalence of psychiatric comorbidity in vertiginous patients. Vertigo and dizzy symptoms themselves can provoke psychological distress, because recurrent unpredictable attacks can induce fear of losing control, concern of serious illness, and worry about severe attacks compromising one s ability to adapt. Recurrent spells can also provoke earlier mental problems. Yet the degree of subjective handicap and emotional distress has shown no close relationship to measures of vertigo symptom severity. Psychiatric disorders do not cause vertigo or dizziness, but can, together with vertigo and dizzy symptoms, lead to persistent complaints. Anxiety and depression are the most common disorders associated with vertigo and dizziness. Vertigo and dizziness in children is not rare. One population-based study found a prevalence of vertigo of 14% (Russell and Abu-Arafeh 1999). The etiology varies, but usually involves organic causes. Psychiatric etiology is investigated only after the exclusion of organic etiology. Psychosomatic symptoms are common in children and adolescents, often reflecting problems in psychosocial background. The first study aimed to evaluate the adapting ability of patients with Ménière s disease based on the sense of coherence scale. Data were collected with two different postal questionnaires involving 547 recipients (Study I). Studies II and III evaluated the prevalence of psychiatric symptoms in vertiginous patients. This study group comprised 100 vertiginous subjects from a randomly selected community sample participating in a vertigo prevalence study in the Helsinki University Hospital district. The investigative program entailed a neuro-otological examination and psychiatric evaluation in questionnaire form. Study IV assessed the prevalence of psychiatric disorders in a group of 119 children and adolescents between the ages of 7 months to 17 years who had visited the ear, nose and throat clinic with a primary complaint of vertigo. An otologist and a psychiatrist reviewed and evaluated each patient s detailed medical history. The results indicate a high sense of coherence (SOC) to represent deeper contentment in life and less psychological distress despite the chronic disease. Although SOC scores did not relate to the severity of illness, subjects with low SOC scores exhibited more symptoms of both vertigo and psychological distress (Study I) than did subjects with high SOC scores. In Studies II and III, the prevalence of depressiveness was 19%, and the prevalence of symptoms of anxiety, 12%. A total of 68% of subjects reported psychiatric symptoms, the most common of which was personality disorder. Comorbidity between depressive, anxiety and personality symptoms were ample and related significantly to reduced functional capacity. In Study IV, the prevalence of psychogenic vertigo was 8%. Major depression was the most common disorder, and 2.5% of patients suffered from somatization disorder. The psychiatric distress commonly reflected psychosocial problems and affected seriously on daily life functioning. In conclusion, this study found that psychiatric symptoms are common in vertiginous patients. Comorbidity may lead to a more debilitating course of vertigo independently of an organic cause or the severity of vertigo symptoms. Feelings of disability correlated with psychological distress. In children and adolescents, vertigo symptoms with compromised daily functioning, together with psychosocial stress factors, should invoke at least the possibility of psychiatric distress. Keywords: vertigo, depression, anxiety, personality disorder, comorbidity, disability, coping, chronic 
  • Ahola, Aila (Helsingin yliopisto, 2012)
    Diabetes is characterized by a number of metabolic disturbances. Self-management, that aims at normalizing these disturbances, constitutes the backbone of diabetes treatment. A number of factors may affect how patients take care of themselves. Knowledge of the current treatment guidelines is not sufficient alone, but must be translated into compliance. Also various psychological determinants, such as depression, may affect how patients take care of themselves. Sense of coherence (SOC), which refers to the extent to which individuals are able to use various resources to sustain and improve health, offers another kind of an approach to the issue of diabetes management. The aim of this thesis was to investigate the adherence with dietary recommendations in patients with type 1 diabetes, and to study the association between self-reported and measured compliance with recommendations. We also investigated the relevance of the SOC in diabetes self care, patients per-ceptions of their disease, and microvascular complications. Moreover the associations between depression and the metabolic syndrome and mortality were evaluated. The thesis is part of the Finnish Diabetic Nephropathy (FinnDiane) study. Compliance with dietary guidelines was highest for the intake of protein, alcohol, and sucrose. A substantial proportion of the participants consumed less carbohydrates, and fibre than recommended. Sodium chloride and saturated fatty acid intakes frequently exceeded the recommendations. Of the micronutrients, the recommendations for vitamin D, folate and iron were most frequently unmet. Self-reported compliance with dietary recommendations was reflected in more frequently meeting the recommendations for carbohydrates, total fat, saturated fatty acids, and alcohol intakes. Despite this, the observed frequencies of meeting the actual guidelines among these patients were, for many nutrients, only modest (e.g., 55% for carbohydrates and 35% for saturated fatty acids). In women, higher SOC score (indicating stronger SOC) was associated with more prudent food choices. In men, the SOC scores were positively associated with higher level of physical activity. Weak SOC was associated with higher HbA1c levels among women. In men, weak SOC was associated with the presence of diabetic nephropathy. Four factors were formed from the diabetes questionnaire (conceptions of HbA1c, complications, diabetes control, and hypoglycaemia). Higher factor scores describing less favourable self-reports were observed for conceptions of HbA1c and hypoglycaemia among those with weak SOC. Moreover, in men, weak SOC was associated with the complications factor. In women, the metabolic syndrome was a more frequent observation among those with symptoms of depression. Of the individual components of the metabolic syndrome, the BDI score was associated with the waist and triglyceride components in women. Purchases of antidepressant agents reduced the 10-year cumulative survival, mostly so among women with such purchases at around the baseline visit. The purchasers of antidepressant agents died mostly of chronic diabetic complications, while the predominant underlying cause of death among non-purchasers were cardiovascular diseases.
  • Talala, Kirsi (Helsingin yliopisto, 2013)
    Mental health problems have shown to be highly prevalent and associated with socio-economic factors in populations worldwide. Persistent or increasing health inequalities are a common phenomenon, however, few studies have explored socioeconomic differences in mental health over time. Psychological distress refers to non-specific psychopathology, which includes symptoms such as depression, insomnia and stress. Psychological distress is prevalent (5 - 48%) and known to be associated with lower quality of life, mental and physical morbidity and mortality. Moreover, psychological distress has been proposed as one probable explanation in mediating the socio-economic gradient in health and mortality. Few studies have examined prevalence trends in psychological distress and changes in socio-economic differences in psychological distress over time, or the contribution of psychological distress to the socio-economic differences in cause-specific mortality. This study aimed to explore these topics. The database was Health Behaviour and Health among the Finnish Adult Population -survey (AVTK, 1979 - 2002) linked with Statistics Finland socio-economic register data, and the Finnish Cause of Death Register follow-up. Outcome measures for psychological distress included self-reported depression, insomnia and stress. Socio-economic status was measured by education, employment status and household income. Mortality data consisted of suicide, accidents and violence, alcohol-related causes of death and coronary heart disease mortality. The overall prevalence of psychological distress was 14 - 20%. Insomnia and stress increased among both genders, whereas depression decreased among women. Socio-economic differences were demonstrated in all psychological distress measures. High risk groups for psychological distress were the unemployed, retired respondents (<65 years) and those with no partner. Those with the lowest household incomes experienced more depression and stress. However, some of the associations were curvilinear and converse. Most notably, stress was most common among the highest educated. Socio-economic differences in psychological distress did not change substantially over time. Depression, insomnia and extremely high stress accounted for some of the socio-economic differences in unnatural but not in CHD mortality. The increase in the prevalence of insomnia and stress, and persistent socio-economic differences in psychological distress present a perceptible public health challenge. However, reversed gradients, especially in stress, should be considered in detail. Improvement of psychological distress in certain socio-economic groups may reduce some of the socio-economic differences, particularly in unnatural mortality.
  • Pirinen, Teija (Helsingin yliopisto, 2012)
    According to the literature, risk for emotional symptoms, anxiety and social dysfunction is increased among youth with inflammatory bowel disease (IBD). Previous studies in this area are, however, sparse and in those that do exist, methodological problems occur. Frequency of sleep disturbances, daytime tiredness, and psychosocial symptoms related to sleeping difficulties in paediatric IBD are so far unstudied. The current study aimed to evaluate the frequency of psychosocial symptoms and sleep problems among Finnish adolescents with paediatric IBD compared to population-based controls. Both parents and adolescents themselves were used as a source of information. The data was collected in spring 2007 as a postal questionnaire-based survey. Parents and adolescents received standardised questionnaires that measured adolescents psychosocial symptoms, competence, sleep, and daytime tiredness (Child Behavior Checklist, CBCL, for parent; Youth Self-Report, YSR, and Sleep Self-Report, SSR, for adolescent). The final study includes 160 (56%) adolescents with IBD and 236 (27%) controls with their parents. The groups of patients and controls were similar according to demographic and descriptive characteristics (gender, age, place of residence and socio-economic status), and represented the whole country well. In the first study, parent and self-reported psychosocial symptoms and competence were evaluated among adolescents with IBD in comparison to the controls, and in the patients, according to severity of IBD symptoms. The main findings here were that the patients reported equally as much psychosocial problems in self-reports as the controls did, even though their parents reported significantly more emotional symptoms, somatic complaints, social problems, thought problems, and lower competence in their children compared to the parents of controls. The frequency of psychosocial problems correlated positively with the severity of IBD symptoms according to both respondents. This study suggests that self-rated questionnaires may not be efficient enough to measure psychosocial well-being of adolescents with IBD and, thus, complementary assessments should be applied. Furthermore, psychosocial evaluation especially among patients with severe IBD symptoms should be routinely applied in clinical visits. Parental evaluation is of great value and should be included in the psychosocial assessment of adolescents with IBD. The second study assessed parent-adolescent agreement regarding emotional, behavioural and somatic symptoms in adolescents with IBD. In 5% of the cases, parents and adolescents agreed on the presence of a psychosocial problem, but in 21% of the cases they disagreed. According to both respondents, no problems existed in 74% of the cases. Altogether, the parent-adolescent agreement rate was poor to low, being lowest on anxious/depressed mood and thought problems, and highest on social problems. The parents reported significantly more often somatic symptoms close to clinical range (subclinical) in their adolescents than the adolescents themselves did. These results indicate that in patients with paediatric IBD, parents and adolescents often disagree on patient s psychosocial problems and somatic complaints. Clinically significant psychosocial and somatic problems would stay unrecognised in this patient group without asking about these symptoms from both the parents and the adolescents themselves. The third study evaluated frequency of parent and self-reported sleep problems and daytime tiredness among adolescents with IBD in relation to the controls and, in the patient group, in relation to the severity of the disease. The results revealed that, according to the parental perception, adolescents with IBD are burdened with more frequent sleep disturbances and overtiredness than the controls. However, self-reported sleep problems and daytime tiredness were equally common in both groups. Parent and self-reported sleep problems and overtiredness associated positively with the self-reported severity of IBD symptoms. Thus, especially those adolescents with IBD who suffer from severe symptoms of the disease should be further assessed for sleep disturbances and daytime tiredness. Finally, the fourth study examined parent and self-reported psychosocial symptoms and somatic complaints in sleep-troubled (n=32) versus non-sleep troubled adolescents with IBD (n=125). According to both respondents, the sleep-troubled patients had more frequent psychosocial problems (especially anxiety/depressed mood and aggressive behaviour) and somatic complaints (various aches and nausea) than their counterparts without sleep trouble. Additionally, SSR-measured sleep quality correlated significantly with parent and self-reported attention problems. These results indicate that in those adolescents with IBD who self-perceive sleeping difficulties, further assessment of psychosocial symptoms and proper evaluation of somatic symptoms is needed, as are the interventions to improve sleep quality among them.
  • af Hällström, Taija (Helsingin yliopisto, 2007)
    Prostate cancer is the most common noncutaneous malignancy and the second leading cause of cancer mortality in men. In 2004, 5237 new cases were diagnosed and altogether 25 664 men suffered from prostate cancer in Finland (Suomen Syöpärekisteri). Although extensively investigated, we still have a very rudimentary understanding of the molecular mechanisms leading to the frequent transformation of the prostate epithelium. Prostate cancer is characterized by several unique features including the multifocal origin of tumors and extreme resistance to chemotherapy, and new treatment options are therefore urgently needed. The integrity of genomic DNA is constantly challenged by genotoxic insults. Cellular responses to DNA damage involve elegant checkpoint cascades enforcing cell cycle arrest, thus facilitating damage repair, apoptosis or cellular senescence. Cellular DNA damage triggers the activation of tumor suppressor protein p53 and Wee1 kinase which act as executors of the cellular checkpoint responses. These are essential for genomic integrity, and are activated in early stages of tumorigenesis in order to function as barriers against tumor formation. Our work establishes that the primary human prostatic epithelial cells and prostatic epithelium have unexpectedly indulgent checkpoint surveillance. This is evidenced by the absence of inhibitory Tyr15 phosphorylation on Cdk2, lack of p53 response, radioresistant DNA synthesis, lack of G1/S and G2/M phase arrest, and presence of persistent gammaH2AX damage foci. We ascribe the absence of inhibitory Tyr15 phosphorylation to low levels of Wee1A, a tyrosine kinase and negative regulator of cell cycle progression. Ectopic Wee1A kinase restored Cdk2-Tyr15 phosphorylation and efficiently rescued the ionizing radiation-induced checkpoints in the human prostatic epithelial cells. As variability in the DNA damage responses has been shown to underlie susceptibility to cancer, our results imply that a suboptimal checkpoint arrest may greatly increase the accumulation of genetic lesions in the prostate epithelia. We also show that small molecules can restore p53 function in prostatic epithelial cells and may serve as a paradigm for the development of future therapeutic agents for the treatment of prostate cancer We hypothesize that the prostate has evolved to activate the damage surveillance pathways and molecules involved in these pathways only to certain stresses in extreme circumstances. In doing so, this organ inadvertently made itself vulnerable to genotoxic stress, which may have implications in malignant transformation. Recognition of the limited activity of p53 and Wee1 in the prostate could drive mechanism-based discovery of preventative and therapeutic agents.
  • Hattula, Katarina (Helsingin yliopisto, 2007)
    Rab8 and its interacting proteins as regulators of cell polarization During the development of a multi-cellular organism, progenitor cells have to divide and migrate appropriately as well as organize their differentiation with one another, in order to produce a viable embryo. To divide, differentiate and migrate cells have to undergo polarization, a process where internal and external components such as actin, microtubules and adhesion receptors are reorganized to produce a cell that is asymmetric, with functionally different surfaces. Also in the adult organism there is a continuous need for these processes, as cells need to migrate in response to tissue damage and to fight infection. Improper regulation of cell proliferation and migration can conversely lead to disease such as cancer. GTP-binding proteins function as molecular switches by cycling between a GTP-bound (active) conformation and a GDP-bound (inactive) conformation. The Ras super-family of small GTPases are found in all eukaryotic cells. They can be functionally divided into five subfamilies. The Ras family members mainly regulate gene expression, controlling cell proliferation and differentiation. Ras was in fact the first human oncogene to be characterized, and as much as 30% of all human tumors may be directly or indirectly caused by mutations of Ras molecules The Rho family members mainly regulate cytoskeletal reorganization. Arf proteins are known to regulate vesicle budding and Rab proteins regulate vesicular transport. Ran regulates nuclear transport as well as microtubule organization during mitosis. The focus of the thesis of Katarina Hattula, is on Rab8, a small GTPase of the Rab family. Activated Rab8 has previously been shown to induce the formation of new surface extensions, reorganizing both actin and microtubules, and to have a role in directed membrane transport to cell surfaces. However, the exact membrane route it regulates has remained elusive. In the thesis three novel interactors of Rab8 are presented. Rabin8 is a Rab8-specific GEF that localizes to vesicles where it presumably recruits and activates its target Rab8. Its expression in cells leads to remodelling of actin and the formation of polarized cell surface domains. Optineurin, known to be associated with a leading cause of blindness in humans (open-angle glaucoma), is shown to interact specifically with GTP-bound Rab8. Rab8 binds to an amino-terminal region and interestingly, the Huntingtin protein binds a carboxy-terminal region of optineurin. (Aberrant Huntingtin protein is known to be the cause Huntington s disease in humans.) Co-expression of Huntingtin and optineurin enhanced the recruitment of Huntingtin to Rab8-positive vesicular structures. Furthermore, optineurin promoted cell polarization in a similar way to Rab8. A third novel interactor of Rab8 presented in this thesis is JFC1, a member of the synaptogamin-like protein (Slp) family. JFC1 interacts with Rab8 specifically in its GTP-bound form, co-localizes with endogenous Rab8 on tubular and vesicular structures, and is probably involved in controlling Rab8 membrane dynamics. Rab8 is in this thesis work clearly shown to have a strong effect on cell shape. Blocking Rab8 activity by expression of Rab8 RNAi, or by expressing the dominant negative Rab8 (T22N) mutant leads to loss of cell polarity. Conversely, cells expressing the constitutively active Rab8 (Q67L) mutant exhibit a strongly polarized phenotype. Experiments in live cells show that Rab8 is associated with macropinosomes generated at ruffling areas of the membrane. These macropinosomes fuse with or transform into tubules that move toward the cell centre, from where they are recycled back to the leading edge to participate in protrusion formation. The biogenesis of these tubules is shown to be dependent on both actin and microtubule dynamics. The Rab8-specific membrane route studied contained several markers known to be internalized and recycled (1 integrin, transferrin, transferrin receptor, cholera toxin B subunit (CTxB), and major histocompatibility complex class I protein (MHCI)). Co-expression studies revealed that Rab8 localization overlaps with that of Rab11 and Arf6. Rab8 is furthermore clearly functionally linked to Arf6. The data presented in this thesis strongly suggests a role for Rab8 as a regulator for a recycling compartment, which is involved in providing structural and regulatory components to the leading edge to participate in protrusion formation.
  • Kotaniemi-Talonen, Laura (Helsingin yliopisto, 2009)
    A randomised and population-based screening design with new technologies has been applied to the organised cervical cancer screening programme in Finland. In this experiment the women invited to routine five-yearly screening are individually randomised to be screened with automation-assisted cytology, human papillomavirus (HPV) test or conventional cytology. By using the randomised design, the ultimate aim is to assess and compare the long-term outcomes of the different screening regimens. The primary aim of the current study was to evaluate, based on the material collected during the implementation phase of the Finnish randomised screening experiment, the cross-sectional performance and validity of automation-assisted cytology (Papnet system) and primary HPV DNA testing (Hybrid Capture II assay for 13 oncogenic HPV types) within service screening, in comparison to conventional cytology. The parameters of interest were test positivity rate, histological detection rate, relative sensitivity, relative specificity and positive predictive value. Also, the effect of variation in performance by screening laboratory on age-adjusted cervical cancer incidence was assessed. Based on the cross-sectional results, almost no differences were observed in the performance of conventional and automation-assisted screening. Instead, primary HPV screening found 58% (95% confidence interval 19-109%) more cervical lesions than conventional screening. However, this was mainly due to overrepresentation of mild- and moderate-grade lesions and, thus, is likely to result in overtreatment since a great deal of these lesions would never progress to invasive cancer. Primary screening with an HPV DNA test alone caused substantial loss in specificity in comparison to cytological screening. With the use of cytology triage test, the specificity of HPV screening improved close to the level of conventional cytology. The specificity of primary HPV screening was also increased by increasing the test positivity cutoff from the level recommended for clinical use, but the increase was more modest than the one gained with the use of cytology triage. The performance of the cervical cancer screening programme varied widely between the screening laboratories, but the variation in overall programme effectiveness between respective populations was more marginal from the very beginning of the organised screening activity. Thus, conclusive interpretations on the quality or success of screening should not be based on performance parameters only. In the evaluation of cervical cancer screening the outcome should be selected as closely as possible to the true measure of programme effectiveness, which is the number of invasive cervical cancers and subsequent deaths prevented in the target population. The evaluation of benefits and adverse effects of each new suggested screening technology should be performed before the technology becomes an accepted routine in the existing screening programme. At best, the evaluation is performed randomised, within the population and screening programme in question, which makes the results directly applicable to routine use.
  • Pietiläinen, Olli (Helsingin yliopisto, 2014)
    Severe mental disorders including schizophrenia often segregate within the same families. Twin and family studies suggest that this co-occurrence is largely genetic, which implies that the different mental disorders have a shared genetic background. Some symptomatic features, such as cognitive impairment also manifest to a variable degree in the majority of severe mental disorders. Cognitive impairment occurs already before the onset of the disease and healthy family members of patients perform worse in cognitive tests than do the general population, which suggests that the cognitive impairment is indicative of genetic loading of the disease. Furthermore, the cognitive impairment persists throughout the disease and is associated with poorer outcome. This led us to hypothesize that the genetic architecture of schizophrenia is more similar to developmental disorders than had been considered earlier. Specifically, we hypothesized that rare high impact genetic variants play a role in the genetic risk for schizophrenia. Rare recurrent large-scale structural variation has long known to cause developmental syndromes, such as Prader-Willi syndrome or Velocardiofacial syndrome. In this study we investigated the role of large-scale chromosomal copy number variants in the genetic background of schizophrenia and other traits hypothesized to reflect abnormal neuronal development. In this study four chromosomal deletions on 1q21, 15q11.2, 15q13.3 and 22q11.2 were identified to be associated with schizophrenia. Three of the deletions occurred recurrently, whereas the deletion on 22q11.22 was a founder mutation enriched especially in the North-East region of Finland. On a population level, carriers of large deletions were found to have more intellectual disability or sub-normality (IQ<85) than non-carriers. Also milder learning difficulties as measured by repeated grades in school were more common among carriers of large deletions. The four deletions specifically identified as associating with schizophrenia are linked to variable phenotypes with the strongest effect manifesting in intellectual disabilities. The regional enrichment of the deletion on 22q11.22 also enabled the assessment of recessive effects related to the deletion. Four individuals, all presenting with a neurodevelopmental phenotype and/or schizophrenia, were identified as homozygous for the deletion. This deletion overlaps one gene encoding for topoisomerase 3 beta (TOP3β) that forms a protein complex with FMRP, the fragile X mental retardation protein, via tudor domain containing 3 (TDRD3) protein. The results of this study imply that rare high risk variants are present in a sub set of schizophrenia patients and that these variants are shared with developmental disorders. The study also demonstrates that special populations such as population isolates can provide useful study designs in identifying rare genetic risk variants, especially with recessive effects for complex traits.
  • Ylösmäki, Erkko (Helsingin yliopisto, 2013)
    MicroRNAs (miRNAs) are small noncoding RNA molecules that have important regulatory roles in a wide range of biological processes. miRNAs are often expressed in a tissue- and/or differentiation state-specific patterns, and it is estimated that miRNAs can regulate the expression of more than 50% of all human genes. We have exploited these tissue-specific miRNA expression patterns in the modification of viral replicative tropism. In order to engineer the replicative tropism of oncolytic adenoviruses, we developed a recombinant adenovirus that in the 3 UTR of the critical E1A gene contains sequences complementary to the liver-specific miRNA miR122. This allowed us to generate a novel recombinant adenovirus that was severely attenuated in human liver, but replicated to high titres in colorectal cancer. Systemic injection of miR122-targeted adenovirus into mice did not induce liver toxicity. In a human lung cancer xenograft mouse model this miR122-targeted adenovirus showed potent antitumour activity. We also studied the possibility to exploit neuron-specific miRNA expression patterns in the modification of tissue tropism of an alphavirus Semliki Forest virus (SFV). We engineered SFV genome to contain sequences complementary to the neuron-specific miRNA miR124. In vitro characterization of this novel virus showed that the modification of the SFV genome per se did not affect polyprotein processing or oncolytic potency. Intraperitoneally administered miR124-targeted SFV displayed an attenuated spread into the central nervous system (CNS) and increased survival of infected mice. Also, mice pre-infected with miR124-targeted SFV elicited strong protective immunity against otherwise lethal challenge with a highly virulent wild-type SFV strain. In conclusion, these results show that miRNA-targeting is a potent new strategy to engineer viral tropism in development of safer and more efficient reagents for virotherapy applications.
  • Järveläinen, Juha (Helsingin yliopisto, 2005)
  • Puputti, Marjut (Helsingin yliopisto, 2012)
    In the present study we investigated expression and amplification of KIT, PDGFRA, VEGFR2 and EGFR in glioblastomas and in lower grade gliomas, and analyzed the hot spot mutation sites of KIT, PDGFRA and EGFR genes for presence of mutations in glioblastoma. Furthermore, we evaluated expression of KIT, SCF and VEGFR2 in paediatric brain tumors and in tumour endothelial cells, and studied the intratumoral heterogeneity of EGFR and KIT amplifications in primary glioblastomas and astrocytomas. Mutations turned out to be infrequent in these genes suggesting that neither primary nor secondary glioblastomas are usually driven by KIT or PDGFRA mutations, or by EGFR kinase domain mutations. Amplifications of KIT, VEGFR2, PDGFRA and EGFR turned out to be frequent in glioblastoma. KIT was amplified in 47% and VEGFR2 in 39% out of the 43 primary glioblastomas investigated, and PDGFRA in 29%. Presence of KIT, PDGFRA and VEGFR2 amplifications were strongly associated (p < 0.0001 for each pair wise comparison) suggesting co-amplification. We investigated presence of gene amplifications also in other types of gliomas either in tumour samples collected at the time of the diagnosis or in samples collected at the time of tumour recurrence. In tumour tissue samples collected at the time of the diagnosis KIT and PDGFRA amplifications turned out to be more frequent in anaplastic astrocytomas than in astrocytomas, oligodendrogliomas and oligoastrocytomas. Amplified KIT was more frequently present in recurrent gliomas than in newly diagnosed. Pilocytic astrocytomas studied did not harbour amplification of KIT. KIT expression was common in tumour endothelial cells in pilocytic astrocytomas, and endothelial cell KIT was frequently activated. Tumour endothelial cell KIT expression was associated with a young age at the time of the diagnosis. Ependymomas also frequently expressed KIT in endothelial cells, and its expression tended to be associated with a young age at the time of the diagnosis. Finally, we investigated heterogeneity of KIT and EGFR amplification and their protein products in gliomas by studying several tissue blocks from each tumour. EGFR amplification was found in ten out of the 15 glioblastomas studied when analysis was carried out from only one tissue block, and in 11 cases when all available tissue blocks were analyzed. KIT was amplified in six out of the 15 index glioblastoma tissue blocks, but in 10 glioblastomas when all tissue blocks were analyzed. These findings suggest that glioblastomas show marked heterogeneity in KIT amplifications and that heterogeneity is less for EGFR amplifications.
  • Mantere, Outi (Helsingin yliopisto, 2007)
    This study is part of an ongoing collaborative bipolar research project, the Jorvi Bipolar Study (JoBS). The JoBS is run by the Department of Mental Health and Alcohol Research of the National Public Health Institute, Helsinki, and the Department of Psychiatry, Jorvi Hospital, Helsinki University Central Hospital (HUCH), Espoo, Finland. It is a prospective, naturalistic cohort study of secondary level care psychiatric in- and outpatients with a new episode of bipolar disorder (BD). The second report also included 269 major depressive disorder (MDD) patients from the Vantaa Depression Study (VDS). The VDS was carried out in collaboration with the Department of Psychiatry of the Peijas Medical Care District. Using the Mood Disorder Questionnaire (MDQ), all in- and outpatients at the Department of Psychiatry at Jorvi Hospital who currently had a possible new phase of DSM-IV BD were sought. Altogether, 1630 psychiatric patients were screened, and 490 were interviewed using a semistructured interview (SCID-I/P). The patients included in the cohort (n=191) had at intake a current phase of BD. The patients were evaluated at intake and at 6- and 18-month interviews. Based on this study, BD is poorly recognized even in psychiatric settings. Of the BD patients with acute worsening of illness, 39% had never been correctly diagnosed. The classic presentations of BD with hospitalizations, manic episodes, and psychotic symptoms lead clinicians to correct diagnosis of BD I in psychiatric care. Time of follow-up elapsed in psychiatric care, but none of the clinical features, seemed to explain correct diagnosis of BD II, suggesting reliance on cross- sectional presentation of illness. Even though BD II was clearly less often correctly diagnosed than BD I, few other differences between the two types of BD were detected. BD I and II patients appeared to differ little in terms of clinical picture or comorbidity, and the prevalence of psychiatric comorbidity was strongly related to the current illness phase in both types. At the same time, the difference in outcome was clear. BD II patients spent about 40% more time depressed than BD I patients. Patterns of psychiatric comorbidity of BD and MDD differed somewhat qualitatively. Overall, MDD patients were likely to have more anxiety disorders and cluster A personality disorders, and bipolar patients to have more cluster B personality disorders. The adverse consequences of missing or delayed diagnosis are potentially serious. Thus, these findings strongly support the value of screening for BD in psychiatric settings, especially among the major depressive patients. Nevertheless, the diagnosis must be based on a clinical interview and follow-up of mood. Comorbidity, present in 59% of bipolar patients in a current phase, needs concomitant evaluation, follow-up, and treatment. To improve outcome in BD, treatment of bipolar depression is a major challenge for clinicians.
  • Natah, Sirajedin Sabri (Helsingin yliopisto, 2001)
  • Ilmarinen, Taru (Helsingin yliopisto, 2013)
    Some manifestations of human papillomavirus (HPV) infection are indolent and self-limiting, while others cause considerable morbidity. In recurrent respiratory papillomatosis (RRP), low-risk HPV types within the respiratory tract cause wart-like lesions, typically on vocal folds. The most common symptom is hoarseness, but stridor may also occur due to airway obstruction. In a minority of patients, the disease becomes aggressive and may undergo malignant transformation. Medical records were reviewed from all patients (n=32) treated for juvenile-onset recurrent respiratory papillomatosis (JORRP) between 1975 and 1994 at Helsinki University Hospital. Eighteen patients participated in a study assessing the effect of JORRP on adult voice quality and health-related quality of life (HRQOL). Compared to age- and gender-matched controls with similar smoking habits, the quality of voice in these adult patients with a history of JORRP was significantly lower in both acoustic and perceptual analyses. Significant differences emerged neither in HRQOL, nor in subjective voice-related handicap. Despite the viral etiology, treatment of RRP is based on surgery. Patients with frequently relapsing or otherwise aggressive disease may benefit from adjuvant medical therapies, such as local injections of cidofovir. Cidofovir is an antiviral medicine officially indicated for intravenous treatment of cytomegalovirus (CMV) retinitis in patients with acquired immunodeficiency syndrome (AIDS). Its intravenous administration has caused nephrotoxic side-effects and neutropenia. Animal studies have raised suspicions of its carcinogenicity. According to its manufacturer, patients treated either by off-label indications, or by an unapproved route of administration (intraocular or topical) have developed severe side-effects. An international multicenter study collected data from 635 RRP patients, 275 of which were treated with cidofovir. Mean follow-up after the first cidofovir injection was 3.3 years. Differences in incidence of upper respiratory tract and tracheal malignancies were non-significant between patients treated with and without cidofovir. After local administration of cidofovir, no clinical evidence emerged for nephrotoxicity or neutropenia. Between 1975 and 2011, a total of 324 RRP patients underwent treatment at Helsinki University Hospital for laryngeal papillomas (LPs). Nine patients (2.8%) developed laryngeal squamous cell carcinoma (SCC). Expression of toll-like receptors (TLRs) 2, 4, and 9 were analyzed in laryngeal tissue specimens from these patients by immunohistochemistry (IHC). Controls were 9 RRP patients without malignant transformation, 23 patients clinically presenting with chronic laryngitis, and 19 laryngeal SCC patients without pre-existing RRP. Compared to specimens from those with chronic laryngitis and laryngeal SCC, expression of cytoplasmic TLR4 and TLR9 was significantly lower in LPs. Nuclear TLR4 staining was significantly lower in LPs undergoing transformation into laryngeal SCC, than in LPs without malignant conversion. In laryngeal SCCs, high cytoplasmic staining for TLR4 was associated with higher grade and advanced T stage. HPV infections are spread through direct contact from skin or mucosa during sexual contact, and from mother to child during labor. Five RRP patients and five patients with genital warts participated with six physicians and twelve nurses in a study investigating transmission of HPV from patients to the oral mucosa and surgical gloves and masks of health care personnel during carbon dioxide (CO2) laser treatment. HPV deoxyribonucleic acid (DNA) was detected by polymerase chain reaction (PCR) on the surgical gloves, but not on the surgical masks or oral mucosa of health care personnel. Provided that protection is sufficient during CO2 laser treatment, the risk for HPV transmission to health care personnel seems low.