β2-adrenoceptor-induced modulation of transglutaminase 2 transamidase activity in cardiomyoblasts

Vyas, FS, Nelson, CP ORCID: https://orcid.org/0000-0003-1034-140X, Freeman, F ORCID: https://orcid.org/0000-0002-9816-266X, Boocock, DJ ORCID: https://orcid.org/0000-0002-7333-3549, Hargreaves, AJ ORCID: https://orcid.org/0000-0001-9754-5477 and Dickenson, JM ORCID: https://orcid.org/0000-0002-9683-969X, 2017. β2-adrenoceptor-induced modulation of transglutaminase 2 transamidase activity in cardiomyoblasts. European Journal of Pharmacology. ISSN 0014-2999

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Abstract

Tissue transglutaminase 2 (TG2) is modulated by protein kinase A (PKA) mediated phosphorylation: however, the precise mechanism(s) of its modulation by G-protein coupled receptors coupled to PKA activation are not fully understood. In the current study we investigated the potential regulation of TG2 activity by the β2-adrenoceptor in rat H9c2 cardiomyoblasts. Transglutaminase transamidation activity was assessed using amine-incorporating and protein cross-linking assays. TG2 phosphorylation was determined via immunoprecipitation and Western blotting. The long acting β2-adrenoceptor agonist formoterol induced time- and concentration-dependent increases in TG2 transamidation. Increases in TG2 activity were reduced by the TG2 inhibitors Z-DON (Benzyloxycarbonyl-(6-Diazo-5-oxonorleucinyl)-L-valinyl-L-prolinyl-L-leucinmethylester) and R283 (1,3,dimethyl-2[2-oxo-propyl]thio)imidazole chloride). Responses to formoterol were blocked by pharmacological inhibition of PKA, extracellular signal-regulated kinase 1 and 2 (ERK1/2), or phosphatidylinositol 3-kinase (PI-3K) signalling. Furthermore, the removal of extracellular Ca2+ also attenuated formoterol-induced TG2 activation. Fluorescence microscopy demonstrated TG2-induced biotin-X-cadaverine incorporation into proteins. Formoterol increased the levels of TG2-associated phosphoserine and phosphothreonine, which were blocked by inhibition of PKA, ERK1/2 or PI-3K signalling. Subsequent proteomic analysis identified known (e.g. lactate dehydrogenase A chain) and novel (e.g. Protein S100-A6) protein substrates for TG2. Taken together, the data obtained suggest that β2-adrenoceptor-induced modulation of TG2 represents a novel paradigm in β2-adrenoceptor cell signalling, expanding the repertoire of cellular functions responsive to catecholamine stimulation.

Item Type:	Journal article
Publication Title:	European Journal of Pharmacology
Creators:	Vyas, F.S., Nelson, C.P., Freeman, F., Boocock, D.J., Hargreaves, A.J. and Dickenson, J.M.
Publisher:	Elsevier B.V.
Date:	25 July 2017
ISSN:	0014-2999
Identifiers:	Number Type 10.1016/j.ejphar.2017.07.043 DOI S0014299917304983 Publisher Item Identifier
Divisions:	Schools > School of Science and Technology
Record created by:	Jill Tomkinson
Date Added:	30 Aug 2017 11:50
Last Modified:	25 Jul 2018 03:00
URI:	https://irep.ntu.ac.uk/id/eprint/31484

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