Short-lived turquoise killifish (Nothobranchius furzeri) have become a popular model organism for neuroscience. In the present paper we study for the first time their behavior in the novel tank diving test and the levels of mRNA of various 5-HT-related genes in brains of 2-, 4- and 6-month-old males and females of N. furzeri. The marked effect of age on body mass, locomotor activity and the mRNA level of Tph1b, Tph2, Slc6a4b, Mao, Htr1aa, Htr2a, Htr3a, Htr3b, Htr4, Htr6 genes in the brains of N. furzeri males was shown. Locomotor activity and expression of the Mao gene increased, while expression of Tph1b, Tph2, Slc6a4b, Htr1aa, Htr2a, Htr3a, Htr3b, Htr4, Htr6 genes decreased in 6-month-old killifish. Significant effects of sex on body mass as well as on mRNA level of Tph1a, Tph1b, Tph2, Slc6a4b, Htr1aa, 5-HT2a, Htr3a, Htr3b, Htr4, and Htr6 genes were revealed: in general both the body mass and the expression of these genes were higher in males. N. furzeri is a suitable model with which to study the fundamental problems of age-related alterations in various mRNA levels related with the brains 5-HT system.

No abstract

The mechanisms of resistance to antidepressant drugs is a key and still unresolved problem of psychopharmacology. Serotonin (5-HT) and brain-derived neurotrophic factor (BDNF) play a key role in the therapeutic effect of many antidepressants. Tryptophan hydroxylase 2 (TPH2) is the rate-limiting enzyme in 5-HT synthesis in the brain. We used zebrafish (Danio rerio) as a promising model organism in order to elucidate the effect of TPH2 deficiency caused by p-chlorophenylalanine (pCPA) on the alterations in behavior and expression of 5-HT-related (Tph2, Slc6a4b, Mao, Htr1aa, Htr2aa) and BDNF-related (Creb, Bdnf, Ntrk2a, Ngfra) genes in the brain after prolonged treatment with two antidepressants, inhibitors of 5-HT reuptake (fluoxetine) and oxidation (pargyline). In one experiment, zebrafish were treated for 72 h with 0.2 mg/L fluoxetine, 2 mg/L pCPA, or the drugs combination. In another experiment, zebrafish were treated for 72 h with 0.5 mg/L pargyline, 2 mg/L pCPA, or the drugs combination. Behavior was studied in the novel tank diving test, mRNA levels were assayed by qPCR, 5-HT and its metabolite concentrations were measured by HPLC. The effects of interaction between pCPA and the drugs on zebrafish behavior were observed: pCPA attenuated “surface dwelling” induced by the drugs. Fluoxetine decreased mRNA levels of Tph2 and Htr2aa genes, while pargyline decreased mRNA levels of Slc6a4b and Htr1aa genes. Pargyline reduced Creb, Bdnf and Ntrk2a genes mRNA concentration only in the zebrafish treated with pCPA. The results show that the disruption of the TPH2 function can cause a refractory to antidepressant treatment.

No abstract

Шизофрениясоциально значимое психическое расстройство, характеризующееся ранним началом и значительными временными и финансовыми затратами на лечение. Антипсихотики высокоэффективны в лечении шизофрении, но в то же время имеют широкий спектр нежелательных лекарственных реакций. Эффективность и безопасность антипсихотиков различна и зависит от характеристик генетически детерминированных механизмов: транспорт, биотрансформация и элиминация.Целью исследования является обозначение важности фармакогенетического тестирования перед началом терапии антипсихотиками на примере клинического случая тяжелых нежелательных реакций у 47летней женщины с шизофренией.Методы: анализ истории болезни пациента; клиническое наблюдение; биохимический анализ сыворотки крови; терапевтический медикаментозный мониторинг; фармакогенетическое тестирование.Клинический случай женщины с шизофренией, у которой было отмечено отсутствие терапевтического ответа на антипсихотики в течение нескольких лет после начала шизофрении. Было обнаружено, что она является гомозиготной носительницей нефункциональных вариантов CYP2D6*4 и CYP2C9*2, гетерозиготной носительницей нефункционального варианта CYP1A1*2A, что стало причиной полного отключения активности изоферментов 2D6, 2C9 и частичного -1A1 семейства CYP в печени и развития нежелательных реакций уже при использовании стартовых доз нескольких антипсихотиков, а также нарастания антипсихотик-индуцированных нежелательных реакций при дальнейшей титрации дозы принимаемых антипсихотиков, нарастания тяжести позитивных (галлюцинации, бред). Отказ от проведения фармакогенетического тестирования до начала назначения антипсихотиков пациентке привело к длительному анамнезу (более 10 лет) антипсихотик-индуцированных нежелательных реакций при применении антипсихотиков в монотерапии и политерапии включая: арипипразол, галоперидол, зуклопентиксол, карипразин, кветиапин, палиперидон, рисперидон, алимемазин, хлорпромазин и др. (метаболизм с участием нефункционального изофермента CYP2D6); галоперидол, клозапин, оланзапин, перфеназин, промазин (метаболизм с участием нефункционального изофермента CYP2C9); галоперидол, оланзапин, пероспирон (метаболизм с участием низкофункционального изофермента СYP1A1).Таким образом, пациентка нуждалась в фармакогенетическом тестировании до назначения антипсихотиков

No abstract

The annual turquoise killifish (Nothobranchius furzeri) is a laboratory model organism for neuroscience of aging. In the present study, we investigated for the first time the levels of serotonin and its main metabolite, 5-hydroxyindoleacetic acid, as well as the activities of the key enzymes of its synthesis, tryptophan hydroxylases, and degradation, monoamine oxidase, in the brains of 2-, 4- and 7-month-old male and female N. furzeri. The marked effect of age on the body mass and the level of serotonin, as well as the activities of tryptophan hydroxylases and monoamine oxidase in the brain of killifish were revealed. The level of serotonin decreased in the brain of 7-month-old males and females compared with 2-month-old ones. A significant decrease in the tryptophan hydroxylase activity and an increase in the monoamine oxidase activity in the brain of 7-month-old females compared to 2-month-old females was shown. These findings agree with the age-related alterations in expression of the genes encoding tryptophan hydroxylases and monoamine oxidase. N. furzeri is a suitable model with which to study the fundamental problems of age-related changes of the serotonin system in the brain.