Paradoxical accumulation of the cyclin-dependent kinase inhibitor p27(kip1) during the cAMP-dependent mitogenic stimulation of thyroid epithelial cells

In different systems, cAMP either blocks or promotes cell cycle progression in mid to late G(1) phase. Dog thyroid epithelial cells in primary culture constitute a model of positive control of DNA synthesis initiation and G(0)-S prereplicative phase progression by cyclic AMP (cAMP) as a second messenger for thyrotropin (TSH), We report here that TSH markedly increases the expression of p27(kip1), the inhibitor of the cell cycle and cyclin-dependent kinases. This effect was prevented by the concomitant administration of the cAMP-independent mitogens, epidermal growth factor (EGF)+serum. EGF+serum also slightly inhibited the weak basal accumulation of p27(kip1). Nevertheless, in the case of stimulation by TSH alone, the cAMP-dependent cell cycle progression was fully compatible with the enhanced expression of p27(kip1). This observation is paradoxical since a decrease of p27(kip1) is generally associated with growth stimulation in other systems, and since a similar cAMP-dependent increase of p29(kip1) in macrophages has been found responsible for mid-G(1) cell cycle arrest. The opposite regulation of p27(kip1) in response to TSH or EGF+serum in dog thyroid epithelial cells suggests a major difference at mid to late G(1) stages between cAMP-dependent and cAMP-independent mitogenic pathways.