Browsing by Subject "Brain"

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  • Roivainen, Reina; Lauronen, Leena; Gaily, Eija; Metsähonkala, Liisa; Peltola, Maria; Laakso, Aki (2018)
  • Vastamäki, Martti; Lyytinen, Jukka; Ylinen, Pekka; Pitkänen, Mikko (2018)
  • Tienari, Pentti; Myllykangas, Liisa (2017)
  • Strandberg, Timo; Tienari, Pentti (2019)
    Amyloiditeoriaa on jouduttu katsomaan uudesta näkökulmasta.
  • Huhtaniska, Sanna; Korkala, Iikka; Heikka, Tuomas; Björnholm, Lassi; Lehtiniemi, Heli; Hulkko, Anja P.; Moilanen, Jani; Tohka, Jussi; Manjon, Jose; Coupe, Pierrick; Kiviniemi, Vesa; Isohanni, Matti; Koponen, Hannu; Murray, Graham K.; Miettunen, Jouko; Jääskeläinen, Erika (2018)
    The aim of this paper was to investigate differences in brain structure volumes between schizophrenia and affective psychoses, and whether cumulative lifetime antipsychotic or benzodiazepine doses relate to brain morphology in these groups. We conducted two systematic reviews on the topic and investigated 44 schizophrenia cases and 19 with affective psychoses from the Northern Finland Birth Cohort 1966. The association between lifetime antipsychotic and benzodiazepine dose and brain MRI scans at the age of 43 was investigated using linear regression. Intracranial volume, sex, illness severity, and antipsychotic/benzodiazepine doses were used as covariates. There were no differences between the groups in brain structure volumes. In schizophrenia, after adjusting for benzodiazepine dose and symptoms, a negative association between lifetime antipsychotic dose and the nucleus accumbens volume remained. In affective psychoses, higher lifetime benzodiazepine dose associated with larger volumes of total gray matter and hippocampal volume after controlling for antipsychotic use and symptoms. It seems that in addition to antipsychotics, the severity of symptoms and benzodiazepine dose are also associated with brain structure volumes. These results suggest, that benzodiazepine effects should also be investigated also independently and not only as a confounder.
  • Pashay Ahi, Ehsan; Duenser, Anna; Singh, Pooja; Gessl, Wolfgang; Sturmbauer, Christian (2020)
    Feeding is a complex behaviour comprised of satiety control, foraging, ingestion and subsequent digestion. Cichlids from the East African Great Lakes are renowned for their diverse trophic specializations, largely predicated on highly variable jaw morphologies. Thus, most research has focused on dissecting the genetic, morphological and regulatory basis of jaw and teeth development in these species. Here for the first time we explore another aspect of feeding, the regulation of appetite related genes that are expressed in the brain and control satiety in cichlid fishes. Using qPCR analysis, we first validate stably expressed reference genes in the brain of six haplochromine cichlid species at the end of larval development prior to foraging. We next evaluate the expression of 16 appetite related genes in herbivorous and carnivorous species from the parallel radiations of Lake Tanganyika, Malawi and Victoria. Interestingly, we find increased expression of two appetite-regulating genes (anorodgenic genes), cart and npy2r, in the brain of carnivorous species in all the three lakes. This supports the notion that appetite gene regulation might play a part in determining trophic niche specialization in divergent cichlid species, already prior to exposure to different diets. Our study contributes to the limited body of knowledge on the neurological circuitry that controls feeding transitions and adaptations in cichlids and other teleosts.
  • Roine, Susanna; Pöyhönen, Minna; Baumann, Marc; Junna, Maija; Kalimo, Hannu; Miao, Qing; Mykkänen, Kati; Tikka, Saara; Tuisku, Seppo; Viitanen, Matti (2010)
  • Heikkinen, Noora; Kärkkäinen, Olli; Laukkanen, Eila; Kekkonen, Virve; Kaarre, Outi; Kivimäki, Petri; Könönen, Mervi; Velagapudi, Vidya; Nandania, Jatin; Lehto, Soili M.; Niskanen, Eini; Vanninen, Ritva; Tolmunen, Tommi (2019)
    Our aim was to analyze metabolite profile changes in serum associated with moderate-to-heavy consumption of alcohol in young adults and to evaluate whether these changes are connected to reduced brain gray matter volumes. These study population consisted of young adults with a 10-year history of moderate-to-heavy alcohol consumption (n = 35) and light-drinking controls (n = 27). We used the targeted liquid chromatography mass spectrometry method to measure concentrations of metabolites in serum, and 3.0 T magnetic resonance imaging to assess brain gray matter volumes. Alterations in amino acid and energy metabolism were observed in the moderate-to-heavy drinking young adults when compared to the controls. After correction for multiple testing, the group of moderate-to-heavy drinking young adults had increased serum concentrations of 1-methylhistamine (p = 0.001, d = 0.82) when compared to the controls. Furthermore, concentrations of 1-methylhistamine (r = 0.48, p = 0.004) and creatine (r = 0.52, p = 0.001) were negatively correlated with the brain gray matter volumes in the females. Overall, our results show association between moderate-to-heavy use of alcohol and altered metabolite profile in young adults as well as suggesting that some of these changes could be associated with the reduced brain gray matter volume. (C) 2018 Elsevier Inc. All rights reserved.
  • Kauhanen, Jenna (Helsingin yliopisto, 2018)
    Histamine is an important neurotransmitter in the central nervous system (CNS). It is involved e.g. in the sleep-wake cycle, endocrine and energy homeostasis as well as in synaptic plasticity and learning. It is produced from L-histidine by histidine decarboxylase (HDC). Almost all species have histamine in their body although the amount varies between species. Histaminergic neurons are located in the tuberomamillary nucleus (TMN) of the posterior hypothalamus. There are four different histamine receptors in mammals and they are all metabotropic GPCR receptors. The first three (Hrh1, Hrh2 and Hrh3) are located in the brain while Hrh1 and Hrh2 along with Hrh4 that is mainly found in mast cells, are found in the periphery. Receptors have different functions e.g. Hrh1 regulates wakefulness and alertness while Hrh2 is involved in learning and memory. It is established that histaminergic neurons contain GABA-producing enzyme GAD1 and GABA itself. In the present study we aimed to evaluate GABAergic phenotype of the hypothalamic histaminergic neurons with double fluorescent in situ hybridization. Specifically, we were interested in co-existence of VGAT, which is responsible for vesicular release of GABA, and HDC mRNA. The animals used in this study were mouse and zebrafish. The percentage of mouse HDC-neurons that expressed GAD1 was 99.65% and co-expression for VGAT was also high (94.53%). This coexistence was verified also in the zebrafish model. Our data suggest that histaminergic neurons containing VGAT mRNA and are potentially able to release GABA. If GABA is released in a paracrine manner like histamine, it causes tonic inhibition that counterbalances the effects of histamine during wakefulness. The fact that VGAT mRNA was also found in zebrafish histaminergic neurons indicates that histamine-GABA system is preserved among species.
  • Semenova, Svetlana; Rozov, Stanislav; Panula, Pertti (2017)
    Catechol-O-methyltransferase (COMT; EC 2.1.1.6) is an enzyme with multiple functions in vertebrates. COMT methylates and thus inactivates catecholamine neurotransmitters and metabolizes xenobiotic catechols. Gene polymorphism rs4680 that influences the enzymatic activity of COMT affects cognition and behavior in humans. The zebrafish is widely used as an experimental animal in many areas of biomedical research, but most aspects of COMT function in this species have remained uncharacterized. We hypothesized that both comt genes play essential roles in zebrafish. Both comt-a and comt-b were widely expressed in zebrafish tissues, but their relative abundance varied considerably. Homogenates of zebra fish organs, including the brain, showed enzymatic COMT activity that was the highest in the liver and kidney. Treatment of larval zebrafish with the COMT inhibitor Ro41-0960 shifted the balance of catecholamine metabolic pathways towards increased oxidative metabolism. Whole-body concentrations of dioxyphenylacetic acid (DOPAC), a product of dopamine oxidation, were increased in the inhibitor treated larvae, although the dopamine levels were unchanged. Thus, COMT is likely to participate in the processing of catecholamine neurotransmitters in the zebrafish, but the inhibition of COMT in larval fish is compensated efficiently and does not have pronounced effects on dopamine levels. (C) 2017 Elsevier Inc. All rights reserved.
  • eQTLGen Consortium (2018)
    Understanding the difference in genetic regulation of gene expression between brain and blood is important for discovering genes for brain-related traits and disorders. Here, we estimate the correlation of genetic effects at the top-associated cis-expression or -DNA methylation (DNAm) quantitative trait loci (cis-eQTLs or cis-mQTLs) between brain and blood (r b ). Using publicly available data, we find that genetic effects at the top cis-eQTLs or mQTLs are highly correlated between independent brain and blood samples (r b = 0.70 for cis-eQTLs and r ^ b = 0.78 for cis-mQTLs). Using meta-analyzed brain cis-eQTL/mQTL data (n = 526 to 1194), we identify 61 genes and 167 DNAm sites associated with four brain-related phenotypes, most of which are a subset of the discoveries (97 genes and 295 DNAm sites) using data from blood with larger sample sizes (n = 1980 to 14,115). Our results demonstrate the gain of power in gene discovery for brain-related phenotypes using blood cis-eQTL/mQTL data with large sample sizes. © 2018 The Author(s).
  • Yli-Pohja, Päivi; Pajo, Kati (2018)
    Ikäkuulo on yhteydessä kognitiiviseen heikentymiseen. Muistisairauden riski pitkällä aikavälillä on todettu useissa tutkimuksissa. Kausaalisuhde on epäselvä: johtaako ikäkuulo kognitiiviseen heikentymiseen vai onko molemmilla yhteisiä syytekijöitä. Kuulonkuntoutus parantaa tiedonkäsittelyvalmiuksia ja toimintakykyä.
  • Nevalainen, Päivi; Ilveskoski, Ismo; Vanhatalo, Sampsa; Lauronen, Leena (2019)
    Kliinisen neurofysiologian menetelmillä selvitetään keskus- ja ääreishermoston sekä lihaksiston sairauksia. Lapsilla yleisin tutkimus on aivosähkökäyrä eli EEG, jolla selvitetään erityisesti kohtausoireiden taustaa. Tavallisia ovat myös uni- ja vireystilatutkimukset, elektroneuromyografia ja herätevastetutkimukset. Erityistilanteissa tarvitaan akuuttihoidon aivomonitorointia, leikkauksenaikaista neuromonitorointia sekä aivotoimintojen paikantamista.
  • van Bijnen, Sam; Kärkkäinen, Salme; Helenius, P.; Parviainen, Tiina M. (2019)
    Specific language impairment (SLI) is a developmental disorder linked to deficient auditory processing. In this magnetoencephalography (MEG) study we investigated a specific prolonged auditory response (N250m) that has been reported predominantly in children and is associated with level of language skills. We recorded auditory responses evoked by sine-wave tones presented alternately to the right and left ear of 9–10-year-old children with SLI (n = 10) and children with typical language development (n = 10). Source analysis was used to isolate the N250m response in the left and right hemisphere. In children with language impairment left-hemisphere N250m responses were enhanced compared to those of controls, while no group difference was found in the right hemisphere. Consequently, language impaired children lacked the typical right-ward asymmetry that was found in control children. Furthermore, left but not right hemisphere N250m responses correlated positively with performance on a phonological processing task in the SLI group exclusively, possibly signifying a compensatory mechanism for delayed maturation of language processing. These results suggest that enhanced left-hemisphere auditory activation reflects a core neurophysiological manifestation of developmental language disorders, and emphasize the relevance of this developmentally specific activation pattern for competent language development. © 2019, The Author(s).
  • Huhtaniska, Sanna; Jaaskelainen, Erika; Heikka, Tuomas; Moilanen, Jani S.; Lehtiniemi, Heli; Tohka, Jussi; Manjon, Jose V.; Coupe, Pierrick; Bjornholm, Lassi; Koponen, Hannu; Veijola, Juha; Isohanni, Matti; Kiviniemi, Vesa; Murray, Graham K.; Miettunen, Jouko (2017)
    High doses of antipsychotics have been associated with loss in cortical and total gray matter in schizophrenia. However, previous imaging studies have not taken benzodiazepine use into account, in spite of evidence suggesting adverse effects such as cognitive impairment and increased mortality. In this Northern Finland Birth Cohort 1966 study, 69 controls and 38 individuals with schizophrenia underwent brain MRI at the ages of 34 and 43 years. At baseline, the average illness duration was over 10 years. Brain structures were delineated using an automated volumetry system, volBrain, and medication data on cumulative antipsychotic and benzodiazepine doses were collected using medical records and interviews. We used linear regression with intracranial volume and sex as covariates; illness severity was also taken into account. Though both medication doses associated to volumetric changes in subcortical structures, after adjusting for each other and the average PANSS total score, higher scan-interval antipsychotic dose associated only to volume increase in lateral ventricles and higher benzodiazepine dose associated with volume decrease in the caudate nucleus. To our knowledge, there are no previous studies reporting associations between benzodiazepine dose and brain structural changes. Further studies should focus on how these observations correspond to cognition and functioning.
  • Komulainen, Emma; Isometsä, Erkki; Ekelund, Jesper (2020)
  • Heiskala, Hannu (2020)
    • Lapsen kehitykseen vaikuttavat geneettiset, epigeneettiset ja ympäristötekijät. • Lapsi kehittyy parhaimpaansa, kun hänen yksilöllisiin tarpeisiinsa vastataan. Keskeistä on tukeva ja ennustettava huoltajasuhde sekä stimuloiva oppimisympäristö. • Kasvuympäristön ollessa kehitykselle suotuisa terapiainterventioilla voidaan edistää haluttuja spesifisiä taitoja. Interventioilla ei kuitenkaan voida muuttaa kokonaiskehitystä. • Lasten ja perheiden palveluiden osaamis- ja tukikeskukset voisivat arvioida eri interventioiden hyötyjä ja muutenkin tukea perustason moniammatillista työtä.
  • Isokuortti, Harri; Luoto, Teemu (2019)
    Tavallisin syy aivovammaan on kaatuminen ja suurin osa vammoista on lieviä. Alkuvaiheessa tärkeintä on sulkea pois vakavan vamman mahdollisuus. Tapahtumatiedot, löydökset ja oireet kirjataan huolellisesti. Olennaisia ovat tajunnan muutokset, muistiaukko ja kuvantamislöydökset. Akuuttivaiheessa ensisijainen kuvantamismuoto on pään tietokonetomografia. Sillä voidaan sulkea pois vakavat kallonsisäiset verenvuodot. Toipumista voidaan edistää oireenmukaisella hoidolla ja potilasohjauksella. Ennuste on hyvä, mutta toipumisen pitkittyessä erikoissairaanhoidon arvio on usein tarpeen.