Relationship between cell adherence and proteoglycan synthesis in cultures of human peripheral blood mononuclear cells: effects of concanavalin A.
Human, blood-derived mononuclear cells (MC), stimulated with Concanavalin A (Con A), synthesized a chondroitin sulfate (CS) proteoglycan (PG), which was elaborated largely by T-cells. Following Con A stimulation, the majority of MC adhered to the culture dish by day 2, but as incubation progressed to day 10 the proportion of non-adherent (NAd) MC increased in a fashion which approximately paralleled the accumulation of PG in the medium. Cell kinetic studies suggest that, following Con A stimulation, there was an inverse relationship between the amount of newly synthesized cellular PG and adherence, which appears to be related to a reciprocal effect on PG synthesis of the declining adherent (Ad) cell density with time of culture. In the stimulated cultures, NAd cells contained much more newly synthesized CS/cell than Ad cells up to day 6 of incubation. Cell type analysis, using monoclonal antibodies against specific cell surface markers, suggested that the higher PG synthesis in the NAd population may, at least in part, be due to a greater proportion of T-helper cells.
Anastassiades
T P
TP
Department of Medicine, Queen's University, Kingston, Ontario, Canada.
Chopra
R K
RK
Ford
P M
PM
Wood
A
A
D002448:Cell Adhesion; D002478:Cells, Cultured / Q000187:drug effects; D011508:Chondroitin Sulfate Proteoglycans / Q000096:biosynthesis*; D003208:Concanavalin A / Q000494:pharmacology*; D006801:Humans; D009000:Monocytes / Q000187:drug effects / Q000378:metabolism*; D013601:T-Lymphocytes / Q000187:drug effects / Q000378:metabolism*
D011508:Chondroitin Sulfate Proteoglycans; D003208:Concanavalin A