Matrix vesicles isolated from mineralization-competent Saos-2 cells are selectively enriched with annexins and S100 proteins.

Abstract:

:Matrix vesicles (MVs) are cell-derived membranous entities crucial for mineral formation in the extracellular matrix. One of the dominant groups of constitutive proteins present in MVs, recognised as regulators of mineralization in norm and pathology, are annexins. In this report, besides the annexins already described (AnxA2 and AnxA6), we identified AnxA1 and AnxA7, but not AnxA4, to become selectively enriched in MVs of Saos-2 cells upon stimulation for mineralization. Among them, AnxA6 was found to be almost EGTA-non extractable from matrix vesicles. Moreover, our report provides the first evidence of annexin-binding S100 proteins to be present in MVs of mineralizing cells. We observed that S100A10 and S100A6, but not S100A11, were selectively translocated to the MVs of Saos-2 cells upon mineralization. This observation provides the rationale for more detailed studies on the role of annexin-S100 interactions in MV-mediated mineralization.

authors

Cmoch A,Strzelecka-Kiliszek A,Palczewska M,Groves P,Pikula S

doi

10.1016/j.bbrc.2011.08.025

subject

Has Abstract

pub_date

2011-09-09 00:00:00

pages

683-7

issue

4

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(11)01410-0

journal_volume

412

pub_type

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