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The Journal of Immunology, Vol 141, Issue 2 559-563, Copyright © 1988 by American Association of Immunologists

ARTICLES

Synthesis and regulation of complement protein factor H in human skin fibroblasts

Y Katz and RC Strunk
Pulmonary Division, St. Louis Children's Hospital, MO 63110.

The alternative pathway of C activation is Ag-independent and forms a first line of defense against infection before immune response. The C3 convertase, C3bBb, formed during activation of the alternative pathway is tightly regulated, with destabilization produced by factor H. Using metabolic labeling with [35S]methionine, immunoprecipitation, and SDS- PAGE, we demonstrated that human skin fibroblasts synthesized and secreted factor H protein. Two forms of the protein were identified, the approximately 160-kDa form seen more prominently in serum and a 45- kDa form that has also been identified in serum. The cells contained two forms of factor H mRNA, 4.4 and 1.8 kb. IFN-gamma increased factor H protein synthesis and mRNA content. No effect was observed with LPS. Neither HepG2 cells or human peripheral blood monocytes synthesized factor H protein or contained factor H mRNA.


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B. H. Ault, B. Z. Schmidt, N. L. Fowler, C. E. Kashtan, A. E. Ahmed, B. A. Vogt, and H. R. Colten
Human Factor H Deficiency. MUTATIONS IN FRAMEWORK CYSTEINE RESIDUES AND BLOCK IN H PROTEIN SECRETION AND INTRACELLULAR CATABOLISM
J. Biol. Chem., October 3, 1997; 272(40): 25168 - 25175.
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