Hippocampus remodeling by chronic stress accompanied by GR, proteasome and caspase-3 overexpression

• Published in: Brain research Vol. 1593; pp. 83 - 94
• Main Authors: Orlovsky, M.A, Dosenko, V.E, Spiga, F, Skibo, G.G, Lightman, S.L
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 17.12.2014; Elsevier
• Subjects: Animals; Astrocytes - pathology; Astrocytes - physiology; Biological and medical sciences; Caspase 3 - metabolism; Chronic Disease; Chronic stress; Cysteine Endopeptidases - metabolism; Fundamental and applied biological sciences. Psychology; Glial Fibrillary Acidic Protein - metabolism; Glucocorticoid receptors; Hippocampus; Hippocampus - pathology; Hippocampus - physiopathology; Male; Mineralocorticoid receptors; Neurology; Neurons - pathology; Neurons - physiology; Proteasome Endopeptidase Complex - metabolism; Proto-Oncogene Proteins c-bcl-2 - metabolism; Rats, Wistar; Receptors, Glucocorticoid - metabolism; Receptors, Mineralocorticoid - metabolism; Restraint stress; Restraint, Physical; RNA, Messenger - metabolism; Stress, Psychological - pathology; Stress, Psychological - physiopathology; TOR Serine-Threonine Kinases - metabolism; Vertebrates: nervous system and sense organs; Restraint stress; Chronic stress; Glucocorticoid receptors; Mineralocorticoid receptors; Hippocampus; Multicatalytic endopeptidase complex; Enzyme; Cysteine endopeptidases; Central nervous system; Gene overexpression; Encephalon; Peptidases; Chronic; Mineralocorticoid receptor; Glucocorticoid receptor; Hydrolases
• ISSN: 0006-8993; 1872-6240
• DOI: 10.1016/j.brainres.2014.09.059

Abstract Chronic stress is a threat to homeostasis for many brain regions. While hippocampal formation is one of the most stress-sensitive areas of the cortex, molecular changes occurring as a result of increased glucocorticoid neurotoxicity in hippocampus are largely unknown. The aim of these studies was to investigate mRNA expression of mineralocorticoid and glucocorticoid receptors (MR, GR), proteasome subunits β5 (constitutive subunit) and β1i (inducible immunoproteasome subunit), mTOR (mammalian target of rapamycin), bcl-2; as well as caspase-3 immunoreactivity (confocal microscopy) in adult Wistar rat hippocampus following 10-day restraint stress (plastic restrainers, 6 h daily). Chronic restraint led to a significant reduction in number of neuronal and astroglial cells in hippocampal regions CA1–3. This reaction was combined with substantial increase in GR and decrease in MR mRNA levels with the greatest response – 1.5-fold amplitude increase – observed in dentate gyrus and CA3 correspondingly. Stress did not change the expression of constitutive β5 subunit but dramatically enhanced expression of inducible β1i subunit and increased mTOR, and bcl-2 mRNA expression. Multiple scattered cells demonstrating caspase-3+ profile were found in hippocampus of stressed animals. The study demonstrates that hippocampal remodeling induced by chronic restraint stress is associated with GR, immunoproteasome, mTOR, caspase-3 and bcl-2 overexpression in hippocampus.