title: Hyaluronidase expression in human skin fibroblasts.
abstract: Hyaluronidase activity has been detected for the first time in normal human dermal fibroblasts (HS27), as well as in fetal fibroblasts (FF24) and fibrosarcoma cells (HT1080). Enzymatic activity was secreted predominantly into the culture media, with minor amounts of activity associated with the cell layer. In both classes of fibroblasts, hyaluronidase expression was confluence-dependent, with highest levels of activity occurring in quiescent, post-confluent cells. However, in the fibrosarcoma cell cultures, expression was independent of cell density. The enzyme had a pH optimum of 3.7 and on hyaluronan substrate gel zymography, activity occurred as a single band corresponding to an approximate molecular size of 57 kDa. The enzyme could be immunoprecipitated in its entirety using monoclonal antibodies raised against Hyal-1, human plasma hyaluronidase. PCR confirmed that fibroblast hyaluronidase was identical to Hyal-1. The conclusion by previous investigators using earlier technologies that fibroblasts do not contain hyaluronidase activity should be reevaluated.
authors.affiliation: School of Public Health, Department of Environmental Health Sciences, University of California, Berkeley, CA 94720, USA.
authors.forename: S
authors.initials: S
authors.lastname: Stair-Nawy
authors.forename: A B
authors.initials: AB
authors.lastname: Csóka
authors.forename: R
authors.initials: R
authors.lastname: Stern
mesh_terms: D002452:Cell Count; D002460:Cell Line; D017077:Culture Media, Conditioned / Q000737:chemistry; D004789:Enzyme Activation / Q000187:drug effects; D005347:Fibroblasts / Q000166:cytology / Q000187:drug effects / Q000201:enzymology*; D005354:Fibrosarcoma / Q000201:enzymology / Q000473:pathology; D015870:Gene Expression / Q000187:drug effects; D006801:Humans; D006821:Hyaluronoglucosaminidase / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D007328:Insulin / Q000494:pharmacology; D007375:Interleukin-1 / Q000494:pharmacology; D008970:Molecular Weight; D011233:Precipitin Tests; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012867:Skin / Q000166:cytology* / Q000196:embryology / Q000201:enzymology*; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D016212:Transforming Growth Factor beta / Q000494:pharmacology
chemical_list: D017077:Culture Media, Conditioned; D007328:Insulin; D007375:Interleukin-1; D016212:Transforming Growth Factor beta; D006821:Hyaluronoglucosaminidase; D013755:Tetradecanoylphorbol Acetate