Growth plate chondrocyte maturation is regulated by basal intracellular calcium.

Abstract:

:Among the cellular events that are associated with the process of endochondral ossification is an incremental increase in chondrocyte basal intracellular free Ca(2+) concentration ([Ca(2+)](i)) from 50 to 100 nM. To determine if this rise in [Ca(2+)](i) functionally participates in the maturational process of growth plate chondrocytes (GPCs), we examined its effect on several markers of hypertrophy, including annexin V, bone morphogenetic protein-6, type X collagen, and indian hedgehog. Expression of these genes was determined under conditions either where the Ca(2+) chelator EGTA was used to deplete extracellular Ca(2+) and lower [Ca(2+)](i) to < 50 nM or where the extracellular addition of 5 mM CaCl(2) was used to elevate [Ca(2+)](i) to > 100 nM. Although no effect on the expression of these genes was observed following treatment with 5 mM CaCl(2), 4 mM EGTA significantly inhibited their expression. This effect was recapitulated in sternal chondrocytes and was reversed following withdrawal of EGTA. Based on these findings, we hypothesized that the EGTA-induced suppression of these genes was mediated by a factor whose expression is responsive to changes in basal [Ca(2+)](i). Since EGTA mimicked the effect of parathyroid hormone-related peptide (PTHrP) on GPC maturation, we examined the effect of low [Ca(2+)](i) on PTHrP expression. Suggesting that low [Ca(2+)](i) suppression of hypertrophy was PTHrP-dependent in GPCs, (a) treatment with 4 mM EGTA increased PTHrP expression, (b) the EGTA effect was rescued by blocking PTHrP binding to its receptor with the competitive antagonist TIP(7-39), and (c) EGTA could mimic the PTHrP stimulation of AP-1 binding to DNA. Additionally, PTHrP promoter analysis identified a domain (-1498 to -862, relative to the start codon) involved with conferring Ca(2+) sensitivity to the PTHrP gene. These findings underscore the importance of cellular Ca(2+) in GPC function and suggest that PTHrP action in the growth plate is at least partially regulated by changes in basal [Ca(2+)](i).

journal_name

Exp Cell Res

authors

Zuscik MJ,D'Souza M,Ionescu AM,Gunter KK,Gunter TE,O'Keefe RJ,Schwarz EM,Puzas JE,Rosier RN

doi

10.1006/excr.2002.5527

keywords:

subject

Has Abstract

pub_date

2002-06-10 00:00:00

pages

310-9

issue

2

eissn

0014-4827

issn

1090-2422

pii

S0014482702955278

journal_volume

276

pub_type

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