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SRC-1 null mice exhibit moderate motor dysfunction and delayed development of cerebellar Purkinje cells

Academic Article
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Overview

authors

  • Nishihara, E.
  • Yoshida-Komiya, H.
  • Chan, C. S.
  • Liao, L.
  • Davis, Ronald
  • O'Malley, B. W.
  • Xu, J. M.

publication date

  • 2003

journal

  • Journal of Neuroscience  Journal

abstract

  • Hormones and nuclear receptors (NRs) play important roles in brain development and function. The recently identified steroid receptor coactivator (SRC) family contains three homologous members that can enhance transcriptional activities of NRs and certain non-NR transcription factors. To study the role of SRC-1 in brain development and function, we examined the spatial and temporal expression patterns of SRC-1 and characterized the phenotypes of brain development and function in SRC-1 knock-out (SRC-1(-)/-) mice. In the adult mouse brain, SRC-1 is highly expressed in the olfactory bulb, hippocampus, piriform cortex, amygdala, hypothalamus, cerebellum, and brainstem. Multiple behavioral tests revealed that SRC-1(-)/- mice exhibit normal hippocampal function but moderate motor dysfunction. The behavior phenotypes correlate with the spatial distribution of the SRC family members. In most brain structures where SRC-1 is expressed, SRC-2 is expressed at lower levels; however, SRC-3 mRNA is detectable only in the hippocampus. In the adult cerebellum, Purkinje cells (PCs) preferentially express SRC-1 over SRC-2, but SRC-2 mRNA is slightly elevated in the SRC-1(-)/- PCs. During embryonic development, SRC-1 is expressed in the cerebellar primordium. SRC-2 is expressed in PCs after postnatal day (P) 10. Time course analysis revealed that the precursors of SRC-1(-)/- PCs were generated approximately 2 d later than wild-type precursor cells. A further delay in SRC-1(-)/- PC maturation was detected at the neonatal stage. The morphology and number of SRC-1(-)/- PCs were equivalent to wild type by P10; this timing correlated with the early expression of SRC-2 in the SRC-1(-)/- PCs. These results demonstrate that the relative levels of SRC expression are region specific, and the degree of overlapping expression may influence their functional redundancy. Disruption of SRC-1 specifically delays the PC development and maturation in early stages and results in moderate motor dysfunction in adulthood.

subject areas

  • Animals
  • Behavior, Animal
  • Brain
  • Cell Culture Techniques
  • Cell Differentiation
  • Cerebellar Cortex
  • Histone Acetyltransferases
  • Mice
  • Mice, Inbred C57BL
  • Mice, Knockout
  • Motor Activity
  • Nuclear Receptor Coactivator 1
  • Nuclear Receptor Coactivator 2
  • Nuclear Receptor Coactivator 3
  • Purkinje Cells
  • RNA, Messenger
  • Stem Cells
  • Time Factors
  • Trans-Activators
  • Transcription Factors
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Research

keywords

  • Purkinje cell
  • animal model
  • coactivator
  • gene expression
  • motor function
  • nuclear receptor
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Identity

International Standard Serial Number (ISSN)

  • 0270-6474

PubMed ID

  • 12514218
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Additional Document Info

start page

  • 213

end page

  • 222

volume

  • 23

issue

  • 1

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