The annexin 2-S100A10 complex and its association with TRPV6 is regulated by cAMP/PKA/CnA in airway and gut epithelia.

Abstract:

:The formation of a heterotetrameric complex between annexin 2 (anx 2) and S100A10 plays an important role in regulating the cellular distribution and biochemical properties of anx 2. A major distinction between the anx 2-S100A10 complex and other annexin-S100 complexes is that S100A10 binding to anx 2 occurs independently of calcium. Here we describe a cyclic 3',5'-adenosine monophosphate (cAMP) and cAMP-dependent protein kinase (PKA, EC 2.7.1.37)-dependent mechanism regulating anx 2-S100A10 complex formation and its interaction with the transient receptor potential vanilloid type 6 channel (TRPV6) in airway and gut epithelia. In both 16HBE14o- and Caco-2 cells, forskolin (FSK) stimulated increased anx 2-S100A10 complex formation, which was attenuated by either PKA inhibitors or calcineurin A (CnA) inhibitors. The anx 2-S100A10 complex association with TRPV6 was dependent on FSK-induced CnA-dependent dephosphorylation of anx 2. Analysis of the significance of the cAMP/PKA/CnA pathway on calcium influx showed that both PKA and CnA inhibitors attenuated Ca(45) uptake in Caco-2, but not 16HBE14o-, cells. Thus, the cAMP/PKA/CnA-induced anx 2-S100A10/TRPV6 complex may require additional factors for calcium influx or play a role independent of calcium influx in airway epithelia. In conclusion, our data demonstrates that cAMP/PKA/CnA signalling is important for anx 2-S100A10 complex formation and interaction with target molecules in both absorptive and secretory epithelia.

journal_name

Cell Calcium

journal_title

Cell calcium

authors

Borthwick LA,Neal A,Hobson L,Gerke V,Robson L,Muimo R

doi

10.1016/j.ceca.2007.11.001

subject

Has Abstract

pub_date

2008-08-01 00:00:00

pages

147-57

issue

2

eissn

0143-4160

issn

1532-1991

pii

S0143-4160(07)00185-6

journal_volume

44

pub_type

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