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Quantitative Analysis of Dietary Vitamin A Metabolites in Murine Ocular and Non-Ocular Tissues Using High-Performance Liquid Chromatography
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The administration of retinoic acid down-regulates cAMP-responsive element modulator (CREM) mRNA in vitamin

Mami Matsuda1, Tomomasa Hyoudou, Masanori Kadowaki

  • 1Department of Agricultural Chemistry, Faculty of Agriculture, Tokyo University of Agriculture, Tokyo, Japan.

Bioscience, Biotechnology, and Biochemistry
|February 24, 2005
PubMed

Insights

Retinoids, essential for sperm development, negatively regulate the expression of the transcription factor CREM (cAMP responsive element modulator). Vitamin A deficiency increases CREM levels, impacting spermatogenesis.

Area of Science:

  • Reproductive biology
  • Molecular endocrinology
  • Spermatogenesis research

Background:

  • Vitamin A and its derivatives (retinoids) are crucial for male reproductive functions, particularly spermatogenesis.
  • The precise molecular mechanisms by which retinoids regulate spermatogenesis remain incompletely understood.

Purpose of the Study:

  • To investigate the role of retinoic acid in regulating downstream transcription factors essential for spermatogenesis.
  • To elucidate the effect of retinoids on the expression of cAMP responsive element modulator (CREM).

Main Methods:

  • Utilized vitamin A deficiency (VAD) rat models.
  • Administered all-trans retinoic acid (ATRA) or retinol to VAD rats.
  • Analyzed testicular mRNA levels of CREM using RT-PCR.

Main Results:

  • Administration of ATRA or retinol to VAD rats down-regulated testicular CREM mRNA levels.
  • Dietary retinoid depletion led to up-regulated CREM expression in adult testes.
  • ATRA specifically repressed the expression of the CREM activator spliced variant (CREMtau).

Conclusions:

  • Retinoids act as negative regulators of CREM expression in the testes.
  • This regulation is critical for maintaining proper spermatogenesis.
  • Findings shed light on the molecular control of sperm development by vitamin A.

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