Substance P regulates the function of rabbit cultured osteoclast; increase of intracellular free calcium concentration and enhancement of bone resorption.

Abstract:

:The effects of substance P on cultured rabbit osteoclasts were investigated. The intracellular Ca(2+) concentration ([Ca(2+)](i)) which was monitored by the microfluorometric technique using fura-2, in osteoclasts elevated by the addition of substance P (0.3-5 microM). The EC(50) value of substance P was about 200 nM. This substance P-evoked [Ca(2+)](i) elevation was not observed in the Ca(2+)-free medium. Simultaneous application of spantide, a substance P receptor antagonist, blocked the Ca(2+) response. The addition of substance P (0.1-10 microM) to cultured osteoclasts enhanced their bone resorption activity which was evaluated by the pit formation assay. Maximum enhancement of the pit formation by substance P (5 microM) peaked at about 170% of the control level. The addition of substance P receptor antagonists also inhibited the enhancement of the bone resorption by substance P addition. Substance P possibly stimulates the bone remodeling by osteoclasts via the [Ca(2+)](i) elevation.

authors

Mori T,Ogata T,Okumura H,Shibata T,Nakamura Y,Kataoka K

doi

10.1006/bbrc.1999.1220

subject

Has Abstract

pub_date

1999-08-27 00:00:00

pages

418-22

issue

2

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(99)91220-2

journal_volume

262

pub_type

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