Cited by 98Neurogenesis and neuroplasticity mechanismsNeuroinflammation and Neurodegeneration MechanismsPharmacological Receptor Mechanisms and Effects

Steroidogenic acute regulatory protein in the rat brain: cellular distribution, developmental regulation and overexpression after injury

Sierra, Amanda, Lavaque, Esteban, Perez‐Martin, Margarita, Azcoitia, Iñigo, Hales, Dale Buchanan, Garcia‐Segura, Luis M.·2003·European Journal of Neuroscience

Abstract

The central nervous system synthesizes steroids which regulate the development and function of neurons and glia and have neuroprotective properties. The first step in this process involves the delivery of free cholesterol to the inner mitochondrial membrane where it can be converted into pregnenolone. This delivery is mediated by steroidogenic acute regulatory protein (StAR). Here, we present a detailed analysis of the distribution of StAR expression in neurons and glia, in the developing, adult and aged male rat brain. Immunohistochemical analysis revealed that StAR is widely distributed throughout the brain, although in each brain area it is restricted to very specific neuronal and astroglial populations. In most regions expressing StAR, immunoreactivity appeared at P10 and the levels of expression then either increased or remained constant until adulthood. In 2‐year‐old rat brains, StAR immunoreactivity was increased compared to young adults. StAR was expressed in the subventricular zone of the adult brain, in proliferating cells which incorporate BrdU as well as in germinal layers in the developing brain. These findings indicate that StAR expression is developmentally regulated and that StAR may play some function in regulating cell proliferation in the brain. Furthermore, StAR mRNA and protein levels were acutely and transiently increased in the hippocampus following excitotoxic brain injury induced by the administration of kainic acid. This raises the possibility that the up‐regulation of StAR expression and the subsequent modifications in steroidogenesis may be part of the mechanisms used by the brain to cope with neurodegeneration.

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Crossref · 10.1046/j.1460-9568.2003.02872.x

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  • Tissue injury and inflammation with subsequent healing is associated with a specific physiological process that involves local production of estrogen from its precursors.

    “Animal experiments with chemotoxic and mechanic stress to astroglia [20, 52, 53] and urinary bladder tissue as well as studies with isolated connective tissue such as fibroblasts and cartilage [54–56] have revealed that tissue injury and inflammation with subsequent healing is associated with a specific physiological process that involves the local production of estrogen from its precursors.”
  • Interleukin-1-induced activation of COX-2 results in production of PGE2, which in turn activates STAR and P450 aromatase.

    “Interleukin-1-induced activation of the cyclooxygenase-2 enzyme (COX-2) results in the production of prostaglandin E2 (PGE2), which in turn activates STAR (steroidogenic acute regulatory protein) and the P450 aromatase.”

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Authors
Sierra, A., Lavaque, E., Perez‐Martin, M., Azcoitia, I., Hales, D. B., & Garcia‐Segura, L. M.
Affiliations
  • Instituto Cajal (ES)
  • University of Illinois Chicago (US)
Venue
European Journal of Neuroscience
Publisher
Wiley
Published
2003-09
Volume
18
Issue
6
Pages
1458-1467
ISSN
  • 0953-816X (ISSN-L)
  • 1460-9568
OpenAlex
W1994096100
Cited by
98
References
54
Citations by year
2026: 1 · 2025: 2 · 2024: 2 · 2023: 1 · 2022: 1 · 2021: 3 · 2020: 2 · 2019: 1 · 2018: 4 · 2017: 5 · 2016: 8 · 2015: 4 · 2014: 3 · 2013: 3 · 2012: 5
FWCI
1.46
Type
journal article
Language
en
Open access
closed
Locations
  • European Journal of Neuroscience (publishedVersion)
  • PubMed (publishedVersion)
  • DIGITAL.CSIC (Spanish National Research Council (CSIC)) (submittedVersion)
Funders
Comunidad de Madrid
Topics
  • Life Sciences › Neuroscience › Developmental Neuroscience › Neurogenesis and neuroplasticity mechanisms
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Pharmacological Receptor Mechanisms and Effects
Keywords
steroidogenic acute regulatory protein, stars, brain steroidogenesis, cholesterol transport, pregnenolone synthesis, neurosteroids, neuronal expression, astrocytes, subventricular zone, brain development, brain aging, excitotoxic brain injury, kainic acid, hippocampus, neurodegeneration, cell proliferation
MeSH terms
Steroidogenic Acute Regulatory Protein, Aging, Animals, Animals, Newborn, Brain Chemistry, Brain Injuries, Bromodeoxyuridine, Immunohistochemistry, Kainic Acid, Male, Neurons, Phosphoproteins, RNA, Messenger, Time Factors, Rats, Wistar, Gene Expression Regulation, Developmental, Excitatory Amino Acid Agonists, Reverse Transcriptase Polymerase Chain Reaction, Rats

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