Mar 10, 1998

Activin regulates betaA-subunit and activin receptor messenger ribonucleic acid and cellular proliferation in activin-responsive testicular tumor cells

N Di SimoneA L Schneyer


Activin, a member of the transforming growth factor-beta superfamily of growth and differentiation factors, has a number of actions in embryonic as well as adult tissues. These actions are mediated via a family of receptors containing two subtypes and at least two members of each subtype. Recent evidence demonstrates that activin-responsive cell lines containing different subsets of these receptors are valuable models for dissecting functional relationships among receptor subtype, signal transduced, and response obtained. TT cells, derived from a p53(-/-)/alpha-inhibin(-/-) mouse testicular tumor, respond to activin by proliferating, a response that can be inhibited by follistatin (FS) treatment. Using semiquantitative RT-PCR methods, we characterized steady state messenger RNA (mRNA) levels for the inhibin/activin subunits, FS, and activin receptor subtypes under basal conditions and in the presence of activin or FS. These cells produced ample immunoreactive activin A and FS, necessitating higher treatment doses to observe any modulation of cellular proliferation. Furthermore, in the presence of exogenous activin, mRNA levels for activin receptor type IIA (ACTRIIA) and betaA were significantly and profoundly suppressed. In add...Continue Reading

Mentioned in this Paper

Inhibin Activity
Tumor Cells, Uncertain Whether Benign or Malignant
ActiVin (Grape Seed Extract)
Transforming Growth Factor beta
Trophic Factor Receptors
Activin Receptor

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