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a Departments of Surgery
b and Medical Biochemistry,
c Molecular, Cellular and Developmental Biology Program,
d and Arthur G. James Cancer Hospital and Research Institute, The Ohio State University, Columbus, Ohio 43215
e Department of Surgery, Children's Hospital, Columbus, Ohio 43205
f Department of Animal, Dairy and Veterinary Sciences, Clemson University, Clemson, South Carolina 29634
g Department of Animal Sciences and Center for Reproductive Biology, Washington State University, Pullman, Washington 99164
Connective tissue growth factor (CTGF) is a growth and chemotactic factor for fibroblasts encoded by an immediate early gene that is transcriptionally activated by transforming growth factor ß. Although the primary translational product of the pig CTGF gene is predicted to be of approximate Mr 38 000, pig uterine luminal flushings (ULF) contained 10- to 20-kDa CTGF proteins that were heparin-binding and mitogenic, whereas 38-kDa CTGF was not apparent. The N-termini of two microheterogeneous forms of 16-kDa CTGF, as well as 18-kDa and 20-kDa forms of CTGF, commenced at, respectively, Cys199, Ala197, Asp186, and Asp186 and did not correspond to intron-exon boundaries in the CTGF gene. Northern blotting revealed a single porcine (p) CTGF transcript of 2.4 kilobases in endometrium from Day 10 to 16 cycling or pregnant pigs. Ten- to twenty-kilodalton pCTGF proteins in ULF were stable for 48 h at 37°C whereas native 38-kDa pCTGF was degraded within 10 min under the same conditions. CTGF-degrading activity in pig ULF was heat-sensitive and concentration- and time-dependent. Ten- to twenty-kilodalton CTGF levels in ULF peaked on Day 16 of the cycle and on Day 12 of pregnancy and were highly correlated with the levels of proteolytic activity for 38-kDa CTGF. Collectively these data suggest that bioactive 10- to 20-kDa CTGF proteins are generated in utero through limited proteolysis of the 38-kDa CTGF primary translational product.
2 Correspondence: D.R. Brigstock, Department of Surgery, Wexner Institute for Pediatric Research, Children's Hospital, 700 Children's Drive, Columbus, OH 43205. FAX: (614) 722–2716; brigstod{at}pediatrics.ohio-state.edu
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