McNeill, E.; Conway, S. J.; Roderick, H. L.; Bootman, M. D. and Hogg, N.
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|DOI (Digital Object Identifier) Link:||http://dx.doi.org/10.1016/j.ceca.2006.05.004|
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The S100 family member S100A9 and its heterodimeric partner, S100A8, are cytosolic Ca2+ binding proteins abundantly expressed in neutrophils. To understand the role of this EF-hand-containing complex in Ca2+ signalling, neutrophils from S100A9 null mice were investigated. There was no role for the complex in buffering acute cytosolic Ca2+ elevations. However, Ca2+ responses to inflammatory agents such as chemokines MIP-2 and KC and other agonists are altered. For S100A9 null neutrophils, signalling at the level of G proteins is normal, as is release of Ca2+ from the IP3 receptor-gated intracellular stores. However MIP-2 and FMLP signalling in S100A9 null neutrophils was less susceptible than wildtype to PLCbeta inhibition, revealing dis-regulation of the signalling pathway at this level. Downstream of PLCβ, there was reduced intracellular Ca2+ release induced by sub-maximal levels of chemokines. Conversely the response to FMLP was uncompromised, demonstrating different regulation compared to MIP-2 stimulation. Study of the activity of PLC product DAG revealed that chemokine-induced signalling was susceptible to inhibition by elevated DAG with S100A9 null cells showing enhanced inhibition by DAG. This study defines a lesion in S100A9 null neutrophils associated with inflammatory agonist-induced IP3-mediated Ca2+ release that is manifested at the level of PLCβ.
|Item Type:||Journal Article|
|Copyright Holders:||2006 Elsevier Ltd.|
|Keywords:||S100; knockout; neutrophil; chemokine; calcium|
|Academic Unit/Department:||Science > Life, Health and Chemical Sciences|
|Depositing User:||Martin Bootman|
|Date Deposited:||25 Oct 2012 09:57|
|Last Modified:||23 Oct 2013 05:20|
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