Induction of cAMP-dependent protein kinase I during human monocyte differentiation.
Differentiation of human peripheral blood monocytes into macrophages was accompanied by induction of the regulatory subunit of cAMP-dependent protein kinase I as determined by photoaffinity labeling of cytosol proteins with 8-N3-[32P]cAMP and DEAE-Sephacel chromatography. The appearance of cAMP-dependent protein kinase I in macrophages was not due to translocation from the particulate fraction of monocytes. The regulatory subunit of cAMP-dependent protein kinase II was present in both monocytes and in vitro-differentiated macrophages. Protein kinase I in macrophages demonstrated higher affinity for 8-N3-cAMP (KD = 0.7 nM) than did protein kinase II from either monocytes (KD = 14.5 nM) or macrophages (KD = 4.9 nM). These studies demonstrate induction of the regulatory subunit of cAMP-dependent protein kinase I during the differentiation of a normal human cell and support the hypothesis that cAMP may regulate some stages of differentiation.[1]References
- Induction of cAMP-dependent protein kinase I during human monocyte differentiation. Wenger, G.D., O'Dorisio, M.S. J. Immunol. (1985) [Pubmed]
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