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Androgen receptor function is modulated by the tissue-specific AR45 variant.

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A novel androgen receptor variant, AR45, primarily found in muscle tissues, inhibits normal androgen receptor function. However, AR45 can stimulate androgen-dependent promoters under specific conditions, revealing complex androgen signaling.

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Area of Science:

  • Molecular Biology
  • Endocrinology
  • Genetics

Background:

  • The human androgen receptor (AR) plays a critical role in cellular processes.
  • Naturally occurring variants of AR can modulate its function and impact cellular responses.

Purpose of the Study:

  • To identify and characterize a novel naturally occurring variant of the human androgen receptor, termed AR45.
  • To investigate the functional properties and cellular roles of AR45.

Main Methods:

  • Identification and molecular characterization of the AR45 variant.
  • Tissue expression analysis using human tissue surveys.
  • Functional assays including co-transfection, proliferation rate measurements, and two-hybrid assays.
  • Investigation of AR45 activity under varying conditions with coactivators and androgens.

Main Results:

  • AR45, lacking exon 1, was mainly expressed in heart and skeletal muscle.
  • AR45 inhibited normal AR function, requiring intact DNA- and ligand-binding domains.
  • AR45 overexpression reduced proliferation in androgen-dependent LNCaP cells.
  • AR45 formed heterodimers with AR, suggesting a mechanism for inhibition.
  • AR45 stimulated androgen-dependent promoters under specific conditions with coactivators like TIF2 or beta-catenin, and androgens like dihydrotestosterone or androstenedione.

Conclusions:

  • AR45 is a significant modulator of androgen receptor activity.
  • The findings introduce a new layer of complexity to androgen action.
  • AR45 may play a crucial role in modulating androgen signaling pathways, particularly in muscle tissues.