title: Humoral factor(s) in hypertensive rats trophic for cultured aortic smooth muscle cells.
abstract: Humoral factors in one-kidney, one-clip (1K,1C) hypertension in rats increase growth of smooth muscle cells cultured from rat arteries. To further characterize the plasma factor or factors involved, we prepared male rats with early, benign 1K,1C hypertension and paired them with one-kidney (1K) normotensive controls. In the presence of growth stimulated by background levels (1%) of fetal calf serum (FCS), plasma-derived serum (PDS), fresh or frozen, from 99 1K,1C rats differentially increased [3H]thymidine incorporation of growth-arrested rat aortic cells; increases were up to 93% more than those evoked by the paired 1K PDS and were concentration related (P < 0.01). However, there was no evidence for a differential effect of 1K,1C PDS in the absence of FCS nor of PDS after boiling. On the other hand, neither treatment of PDS with proteolytic enzymes nor charcoal absorption ablated this differential trophic effect. Thus this study provides evidence that the humoral factor(s) in hypertension are resistant to freezing, proteolysis, and charcoal absorption, but sensitive to boiling, and they require background levels of growth for expression.
authors.affiliation: Department of Medicine, West Virginia University School of Medicine, Morgantown 26506.
authors.forename: H W
authors.initials: HW
authors.lastname: Overbeck
authors.forename: G
authors.initials: G
authors.lastname: Wu
authors.forename: J P
authors.initials: JP
authors.lastname: Durham
mesh_terms: D000818:Animals; D001011:Aorta / Q000378:metabolism* / Q000473:pathology; D001790:Blood Physiological Phenomena; D002417:Cattle / Q000097:blood / Q000196:embryology; D002478:Cells, Cultured; D005312:Fetal Blood / Q000502:physiology; D006133:Growth Substances / Q000378:metabolism*; D006978:Hypertension, Renovascular / Q000378:metabolism* / Q000473:pathology; D008297:Male; D009131:Muscle, Smooth, Vascular / Q000378:metabolism* / Q000473:pathology; D051381:Rats; D017207:Rats, Sprague-Dawley; D013936:Thymidine / Q000493:pharmacokinetics
chemical_list: D006133:Growth Substances; D013936:Thymidine