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Membrane association of the hyaluronate stimulatory factor from LX‐1 human lung carcinoma cells
Author(s) -
Knudson Warren,
Toole Bryan P.
Publication year - 1988
Publication title -
journal of cellular biochemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.028
H-Index - 165
eISSN - 1097-4644
pISSN - 0730-2312
DOI - 10.1002/jcb.240380304
Subject(s) - membrane , trypsin , fibroblast , stimulation , microbiology and biotechnology , vesicle , cell culture , chemistry , biology , biochemistry , in vitro , endocrinology , enzyme , genetics
LX‐1 human lung carcinoma cells interact with human fibroblasts in culture to cause an increase in hyaluronate production (Knudson et al: Proceedings of the National Academy of Sciences of the United States of America 81:6767, 1984). It is shown here that a similar increase in hyaluronate production also occurs when membranes derived from LX‐1 cells, or detergent extracts thereof, are added to cultures of the human fibroblasts. However, no stimulation occurs when membranes or extracts from fibroblasts are added to cultures of the LX‐1 cells. The hyaluronate stimulatory factor present in the detergent extracts is a heat‐ and trypsin‐sensitive protein, requires more than 12 h for its action on fibroblasts, causes an elevation in hyaluronate synthetase activity in membranes derived from the fibroblasts, and can be reconstituted into artificial lipid vesicles. Thus, it is concluded that the stimulatory factor is a membrane‐bound protein present on the surface of the LX‐1 cells and that it interacts with fibroblasts to induce increased hyaluronate synthesis.