title: SECMA 1, a mitogenic hexapeptide from Ulva algeae modulates the production of proteoglycans and glycosaminoglycans in human foreskin fibroblast.
abstract: SECMA 1 is a polypeptide purified from a green algeae of the Ulva species by several gel chromatographies, showing the following sequence (Glu-Asp-Arg-Leu-Lys-Pro). In order to determine the effect of SECMA 1 on human skin fibroblasts extracellular matrix, proteoglycans (PGs) and glycosaminoglycans (GAGs) were assayed after 24 h incubation of 20 day-old foreskin fibroblasts at the 2nd passage. The results revealed that most of [35S]sulphate was associated with fibroblast membranes, which contained (67%) of the total de novo synthesized sulphated PGs, in two distinct forms: one hydrophilic (39%), and one hydrophobic (28%). The remaining 'matrix' retained 5% of proteoglycans. The remaining 35S-label may represent the free label in the cytosol. After 24 h incubation of skin fibroblasts with different concentrations of SECMA 1 (2, 4 and 10 micrograms/ml), the [35S]sulphate incorporation into PGs of Salt-extract, sodium deoxycholate (DOC) extract and Guanidine hydrochloride (GuA-HCl)-extract was increased significantly (P < 0.005) with 4 micrograms/ml, as compared to untreated control. The most effective concentration (4 micrograms/ml) increased the different [35S]sulphate PGs extracts (NaCl, DOC and GuA-HCl) by respectively (66; 17 and 75%). The relative contents of iduronic and glucuronic acid in the GAG produced by skin fibroblasts were estimated. No effect of SECMA 1 on the incorporation of [35S]sulphate into Heparan sulphate was found. The incorporation of [35S]sulphate into (chondroïtine sulphate + heparan sulphate) and (chondroïtine sulphate + dermatan sulphate) was increased by respectively 37% and 11% by SECMA 1 (4 micrograms/ml).
authors.affiliation: Palmer research, Arbanats, France.
authors.forename: R
authors.initials: R
authors.lastname: Ennamany
authors.forename: D
authors.initials: D
authors.lastname: Saboureau
authors.forename: N
authors.initials: N
authors.lastname: Mekideche
authors.forename: E E
authors.initials: EE
authors.lastname: Creppy
mesh_terms: D000595:Amino Acid Sequence; D002455:Cell Division / Q000187:drug effects; D002478:Cells, Cultured; D000460:Chlorophyta / Q000737:chemistry; D005347:Fibroblasts / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism*; D006025:Glycosaminoglycans / Q000096:biosynthesis*; D006801:Humans; D009842:Oligopeptides / Q000494:pharmacology*; D011509:Proteoglycans / Q000096:biosynthesis*; D013462:Sulfur Radioisotopes
chemical_list: D006025:Glycosaminoglycans; D009842:Oligopeptides; D011509:Proteoglycans; D013462:Sulfur Radioisotopes