Abstract
Introduction
Carboxypeptidase M (CPM) is a glycosylphosphatidylinositol anchored enzyme that plays an important role in the kallikrein–kinin system (KKS). CPM catalytic domain hydrolyzes Arg from C-terminal peptides (i.e., bradykinin and kallidin), generating des-Arg-kinins, the agonists of B1 receptor (B1R). It is known that CPM and kinin B1R are co-localized in the plasma membrane microdomains, where they interact with each other, facilitating receptor signaling.
Aims
We hypothesized here that this CPM-B1R interaction could also affect the activity of the enzyme.
Methods
Thus, in this work, we evaluated the impact of B1R presence or absence on CPM activity and expression, using primary culture of microvascular endothelial cells from wild-type, kinin B1R knockout mice (B −/−1 ), and transgenic rats overexpressing B1 receptor exclusively in the endothelium. In addition, HEK293T cells, as wells as B −/−1 primary culture of endothelial cells, both transfected with B1R, were also used.
Results
CPM expression and activity were downregulated in cells of knockout mice compared to control and this reduction was rescued after B1R transfection. Cells overexpressing B1R presented higher levels of CPM mRNA, protein, and activity. This profile was reverted by pre-incubation with the B1R antagonist, R715, in highly expressing receptor cells.
Conclusions
Our data show that kinin B1R positively modulates both CPM expression and activity, suggesting that CPM-B1R interaction in membrane microdomains might affect enzyme activity, beyond interfering in receptors signaling. This work highlights the interactions among different components of KKS and contributes to a better understanding of its patho-physiological role.
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Acknowledgements
We thank Eduardo Spitti Resende for technical assistance.
Funding
This work was supported by grants from the São Paulo State Research Foundation—FAPESP (Grant Nos. 2014/03790-5 and 2014/27198-8) and research fellows from the Brazilian National Research Council (CNPq), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) (Grant No. 374/12), and Deutsche Akademische Austauchdienst Probral.
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Guimarães, P.B., da Silva, R.F., Hoff, C.C. et al. Interactions between carboxypeptidase M and kinin B1 receptor in endothelial cells. Inflamm. Res. 68, 845–855 (2019). https://doi.org/10.1007/s00011-019-01264-6
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DOI: https://doi.org/10.1007/s00011-019-01264-6