title: CD49f (alpha 6 integrin) and CD66a (BGP) are specifically induced by retinoids during human monocytic differentiation.
abstract: Retinoic acid (RA) and 1,25(OH)2-cholecalciferol (VitD3) are potent regulators of normal and malignant myeloid cells. In the human monoblast cell line U-937 they induce terminal differentiation, and the resulting phenotypes display both common and distinct, inducer-specific, properties. This paper shows that in U-937 cells the two retinoids, all-trans and 9-cis RA, induced the expression of CD49f (alpha 6 integrin subunit) and CD66a (biliary glycoprotein, BGP) mRNA and protein. In contrast, expression of CD49f and CD66a was not found in untreated or VitD3-induced cells. Cytokine-induced modulation of CD49f and CD66a expression was restricted to the retinoid-induced U-937 cells. The retinoid specific induction of CD49f and CD66a was confirmed in the related monoblastic cell line THP-1. Human blood monocytes and the monocytic cell line Mono Mac 6 responded poorly to RA, with respect to the regulation of CD49f and CD66a expression, indicating that early monocytic precursors were targets for the retinoid-specific regulation. Thus, the expression of CD49f and CD66a is developmentally regulated and specifically induced by all-trans and 9-cis Ra in human monocytic cells.
authors.affiliation: Department of Pathology, Uppsala University, University Hospital, Sweden.
authors.forename: J
authors.initials: J
authors.lastname: Botling
authors.forename: F
authors.initials: F
authors.lastname: Oberg
authors.forename: K
authors.initials: K
authors.lastname: Nilsson
mesh_terms: D015703:Antigens, CD / Q000096:biosynthesis*; D000943:Antigens, Differentiation / Q000096:biosynthesis*; D015815:Cell Adhesion Molecules; D002454:Cell Differentiation / Q000187:drug effects; D002460:Cell Line; D002762:Cholecalciferol / Q000494:pharmacology*; D006801:Humans; D039503:Integrin alpha6; D007641:Keratolytic Agents / Q000494:pharmacology*; D009000:Monocytes / Q000378:metabolism* / Q000473:pathology; D014212:Tretinoin / Q000494:pharmacology*
chemical_list: D015703:Antigens, CD; D000943:Antigens, Differentiation; C069847:CD66 antigens; D015815:Cell Adhesion Molecules; D039503:Integrin alpha6; D007641:Keratolytic Agents; D002762:Cholecalciferol; D014212:Tretinoin