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01-03-2021 | Original Article

Neonatal proinflammatory challenge evokes a microglial response and affects the ratio between subtypes of GABAergic interneurons in the hippocampus of juvenile rats: sex-dependent and sex-independent effects

Authors: Mikhail Yu Stepanichev, Tatyana Goryakina, Anna Manolova, Natalia Lazareva, Alexey Kvichanskii, Liya Tretyakova, Maria Volobueva, Natalia Gulyaeva

Published in: Brain Structure and Function | Issue 2/2021

Abstract

Neonatal proinflammatory challenge (NPC) may contribute to the development of psychiatric disorders in adults. A double exposure of neonatal rats to lipopolysaccharide, a component of cellular wall of gram-negative bacteria, on postnatal days 3 and 5 provokes the development of depressive- and anxiety-like behaviors. NPC impairs neuroplasticity and cognition in adult animals, significant modifications of neuroplasticity being evident even in adolescence. We studied effects of NPC on microglia and GABAergic neuronal population of the dorsal hippocampus in juvenile male and female rats using immunofluorescent histochemistry. The expression of glutamic acid decarboxylase-67 (GAD67) and calcium-binding proteins calretinin, calbindin, and parvalbumin were used as quantitative markers of GABAergic interneurons and their specific subpopulations, respectively. NPC induced changes of microglial morphology indicating inflammatory activation mostly expressed in CA3 field; the effect was similar in males and females. The number of GAD67 expressing neurons was similar in the dorsal hippocampus of females and males independently on the NPC. The portion of calbindin-immunoreactive GAD67-positive neurons significantly increased while the portion of calretinin-immunoreactive GAD67-positive neurons significantly decreased in the CA1 field of rats exposed to NPC independently on their sex. NPC did not affect the parvalbumin-positive subpopulation of GABAergic neurons in the hippocampus of rats of either sex. These data suggest that NPC-induced modification of GABAergic neuronal population composition under the proinflammatory conditions is involved in the maintenance of excitation/inhibition homeostatic balance in the hippocampus.

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Title: Neonatal proinflammatory challenge evokes a microglial response and affects the ratio between subtypes of GABAergic interneurons in the hippocampus of juvenile rats: sex-dependent and sex-independent effects
Authors: Mikhail Yu Stepanichev
Tatyana Goryakina
Anna Manolova
Natalia Lazareva
Alexey Kvichanskii
Liya Tretyakova
Maria Volobueva
Natalia Gulyaeva
Publication date: 01-03-2021
Publisher: Springer Berlin Heidelberg
Published in: Brain Structure and Function / Issue 2/2021
Print ISSN: 1863-2653
Electronic ISSN: 1863-2661
DOI: https://doi.org/10.1007/s00429-020-02199-z

At a glance: The STEP trials

Springer Medicine

Neonatal proinflammatory challenge evokes a microglial response and affects the ratio between subtypes of GABAergic interneurons in the hippocampus of juvenile rats: sex-dependent and sex-independent effects

Abstract

At a glance: The STEP trials

Springer Medicine

Abstract

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