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ATP-dependent activation of L cell glucocorticoid receptors to the steroid binding form

ATP-dependent activation of L cell glucocorticoid receptors to the steroid binding form

Journal of Biological Chemistry 254(11): 4772-4778

ISSN/ISBN: 0021-9258

PMID: 108283

The specific glucocorticoid binding capacity in cytosols prepared from L929 mouse fibroblasts (L cells) is inactivated with a half-life of approximately 2 h at 25 degrees C. As previously published, this inactivation can be prevented with 10 mM molybdate and markedly slowed by addition of other phosphatase inhibitors such as glucose 1-phosphate and fluoride. We have now found that ATP (5 to 10 mM) also slows the rate of this inactivation. After extensively inactivating the receptor by preincubating cytosol at 25 degrees C for 4 and preventing further inactivation by addition of molybdate, addition of ATP results in reactivation of the steroid binding capacity. Maximal reactivation of 40 to 70% is achieved with 5 to 10 mM ATP. The activation is temperature-dependent and specific for ATP. ADP, GTP, CTP, and UTP do not cause activation and preliminary results indicate no effect of cyclic nucleotides in this system. If activation is prevented by addition of 10 mM EDTA to the cytosol, addition of 3 to 10 mM magnesium permits ATP-dependent activation of the binding capacity. The level of reactivation can be enhanced by addition of a heat-stable factor prepared from the same L cell supernatant. These results support the proposal that L cell glucocorticoid receptors can be activated to the glucocorticoid binding state by an ATP-dependent phosphorylation mechanism.

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Accession: 038907764

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