Send to

Choose Destination
See comment in PubMed Commons below
Immunology. 1985 Dec;56(4):667-72.

Thrombin-induced degranulation of cultured bone marrow-derived mast cells: effect on calcium uptake.


The role of calcium in the mechanism of thrombin activation of bone marrow-derived mast cells (BMMC) was explored by measuring the changes in the uptake of 45Ca2+ into quiescent BMMC and into cells stimulated by thrombin or by IgE-antigen. The results indicate that activation of BMMC by either thrombin or IgE-antigen is Ca2+-dependent. One million BMMC, activated by 0.05-5 U thrombin, accumulated 45Ca2+ in a concentration-dependent manner, which levelled off at around 1 U thrombin. Extracellular 45Ca2+ uptake of thrombin-stimulated cells is saturable within 90 seconds and corresponds to the kinetics of histamine release, whereas that of IgE-antigen exposed cells continues unabated for over 5 min. The pattern of 45Ca2+ uptake of IgE-sensitized BMMC exposed to thrombin suggests that the pro-stimulatory locus of thrombin action on the surface membrane is distinct from that of IgE.

[Indexed for MEDLINE]
Free PMC Article
PubMed Commons home

PubMed Commons

How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for PubMed Central
    Loading ...
    Support Center