BRAIN CELLS REACTION IN A RESPONSE TO ANTIGEN INJECTION IN ANIMALS EXPOSED TO ACUTE PRENATAL STRESS

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Abstract


Prenatal stress is one of the major cause of long-term disorders in behavioral and neuroimmunne processes. Emotional prenatal maternal stress (PRMS) performsin an offspring tendency to anxiety, depressive-like behavior and weakening memorizing skills. The study field was to determinate preproorexin gene expression of the maturity rats held in prenatal stress on the 19th day. The expression level was measured in two hours after intravenous LPS injection. qPCR shoved significant reduction in preproorexin gene expression in hypothalamus cells. This result corresponds with behavioral tests where animals exposed to stress during the late term of in utero development demonstrate less motion search activity which allovers to suspect a connection between prenatal stress and incidences of psycho-neuro-immunne relationships disorders.

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Introduction. Prenatal development influences on functional abilities of an adult organism [2]. Emotional prenatal maternal stress (PRMS) during late pregnancy reflects in progeny through increasing anxiety level, depressive-like behavior and lower memorizing skills [3]. Restricted mobility is the most often used method to stimulate emotional stress in rodents. Hypothalamic neuropeptide orexin plays an important role in the pathophysiology of mental disorders, including depression [4]. Consequences of chronic emotional maternal stress have received wide coverage in many publications [3, 4] while acute impact is still not studied enough. The purpose of this study was to determine hypothalamic preproorexin gene expression in a response to intravenous LPS injection from old rats stressed prenatally on 19th day of intrauterine development. Materials and methods. On the 19th day of pregnancy, female rats were exposed to emotional stress through a restriction in a plastic tube for 20 minutes. Four months old male offspring were divided into two groups - 13 reared in standard condition (subgroups 1 and 2), and 12 exposed to PRMS (subgroups 3 and 4). LPS (E. Coli 055:B5, “Sigma”, L2880) was injected into the tail vein in 500 mcl/kg dose (table). Hypothalamus samples were taken in two hours after injection. “Aurum Total RNA Fatty and Fibrous Tissue Pack” (Bio-Rad) kit was used for mRNA isolation. Reverse transcription (RT) reaction was performed according to the standard protocol. Primer pairs for qPCRwere made by “Beagle”: preproorexin (PPOx): sense 5’-TGTCGCCCAGAAGACGTGTTC CTG-3’: antisense 5’-AAGACGGGTTCACACACTCT-GG-ATC-3’, annealing temperature 62 °C; G3PDH: sense 5’-CCACTCA-GAAGACTGTGGAT-3’, antisense 5’-GTCATCATACTTGGCAGGTT-3’, annealing temperature 55 °C. 10mcliTaq™ Universal SYBR® Green Supermix (BioRad) was used as reaction master. QPCR was performed by CFX384 Touch amplificatory. Gene expression level was majored to G3PDH gene by using 2-ΔΔCq method. Data were analyzed by U-criterion. QPCR products were identified by melt curves analyze. Results. According to qPCR results, control animals have a significantly higher level of PPO gene expression in two hours after LPS intravenous injection which have a confirmation in publications [5]. It has been observed that in PRMS group, in two hours after intravenous LPS injection, the level of PPO gene expression was reliable lower compare to subgroups 2 and 3 (Figure). Discussion. In adults animals stressed prenatally during lateterm of intrauterine development was defined lover searching activity and stress tolerance compare to animals reared in standard condition. Previously collected data [1] and the results of this study demonstrate that it is possible to assume connection between decreasing level of PPO gene expression in neurons in a response to antigen introduction and stress tolerance. Conclusion. From the literature and own outcomes must be assumed that prenatal stress during late pregnancy manifests itself in an adult offspring in a disruption of neuroimmune interactions.

About the authors

P S Shakleina

Institute of Experimental Medicine, Saint Petersburg


N S Novikova

Institute of Experimental Medicine, Saint Petersburg


References

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