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Int J Biol Macromol. 2015 Jan;72:673-9. doi: 10.1016/j.ijbiomac.2014.09.017. Epub 2014 Sep 28.

Serine proteases as candidates for proteolytic processing of angiotensin-I converting enzyme.

Author information

1
Department of Medicine, Nephrology Division, Federal University of São Paulo, Brazil.
2
Albert Einstein Research Institute, Brazil.
3
Department of Biophysics, Federal University of São Paulo, Brazil.
4
Department of Medicine, Nephrology Division, Federal University of São Paulo, Brazil. Electronic address: casarini.elena@unifesp.br.

Erratum in

  • Int J Biol Macromol. 2015 Nov;81:1099-110.

Abstract

Somatic angiotensin-I converting enzyme (sACE) is a broadly distributed peptidase which plays a role in blood pressure and electrolyte homeostasis by the conversion of angiotensin I into angiotensin II. N-domain isoforms (nACE) with 65 and 90 kDa have been described in body fluids, tissues and mesangial cells (MC), and a 90 kDa nACE has been described only in spontaneously hypertensive rats. The aim of this study was to investigate the existence of proteolytic enzymes that may act in the hydrolysis of sACE generating nACEs in MC. After the confirmation of the presence of ACE sheddases in Immortalized MC (IMC), we purified and characterized these enzymes using fluorogenic substrates specifically designed for ACE sheddases. Purified enzyme identified as a serine protease by N-terminal sequence was able to generate nACE. In the present study, we described for the first time the presence of ACE sheddases in IMC, identified as serine proteases able to hydrolyze sACE in vitro. Further investigations are necessary to elucidate the mechanisms responsible for the expression and regulation of ACE sheddases in MC and their roles in the generation of nACEs, especially the 90 kDa form possibly related to hypertension.

KEYWORDS:

Angiotensin-I converting enzyme; Shedding, Mesangial cells

PMID:
25263467
DOI:
10.1016/j.ijbiomac.2014.09.017
[Indexed for MEDLINE]

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