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. 1989 Mar 15;258(3):861–867. doi: 10.1042/bj2580861

Identification of a novel inflammatory stimulant of chondrocytes. Early events in cell activation by bradykinin receptors on pig articular chondrocytes.

H P Benton 1, T R Jackson 1, M R Hanley 1
PMCID: PMC1138443  PMID: 2499310

Abstract

The inflammatory peptide bradykinin stimulated a rapid and transient increase in cytoplasmic [Ca2+] in primary pig chondrocytes, as measured by the fluorescent indicator dye Fura-2. This increase occurred in the absence of extracellular Ca2+, indicating a mobilization from intracellular stores. The elevation in intracellular [Ca2+] was mediated by authentic bradykinin receptors, since it was blocked by the specific bradykinin antagonist [beta-(2-thienyl)-L-Ala5,8,D-Phe7]bradykinin. Activation of chondrocytes by bradykinin induced a concentration-dependent [ED50 (dose for half-maximal response) approximately 40 nM] accumulation of inositol monophosphate in the presence of LiCl and a concentration-dependent increase in production of prostaglandin E2. The generation of the secondary mediator prostaglandin E2 was a biologically relevant output response induced by bradykinin, but chondrocyte responses, such as the rate of entry into DNA synthesis, the rate and pattern of new protein synthesis and the rate of synthesis and resorption of cartilage proteoglycan, were unaltered by bradykinin treatment. Chondrocytes were also shown to be activated by two pharmacological mediators of cytosolic [Ca2+] elevation, i.e. the ionophore A23187 and thapsigargin, which both produced alterations in protein synthesis which were mimicked by bradykinin. Thus Ca2+-sensitive pathways exist which are not functionally responsive to a Ca2+-mobilizing and inositol phosphate-generating hormone, potentially indicating other routes of regulation. These results call attention to bradykinin and related peptides as another class of inflammatory mediators which may regulate physiological and pathological chondrocyte metabolism.

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Selected References

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