Activation of the first component of complement, C1: comparison of the effect of sixteen different enzymes on serum C1.

Abstract:

:In this study, the effect of sixteen different enzymes on serum C1 and its subcomponents was investigated. The sixteen enzymes could be divided into three groups. First, enzymes which activate native C1: trypsin (optimal concentration 2.4 x 10(-4) mM); alpha-chymotrypsin (2.3 x 10(3) mM); thrombin (1.0 x 10(-5) mM); plasmin (1.9 x 10(-5) mM); elastase (5.8 x 10(-5) mM); pronase (3.0 x 10(-6) mM). All these enzymes are serine esterase and activate native serum C1 bound to EAC4 at the given concentration within 10 min at 30 degrees C. Furthermore, native C1 inhibited by a pentosanpolysulfoester, Sp54, is unable to undergo the internal activation but can be externally activated by the serine esterases. Second, enzymes which do not activate native C1 but result in a dose and time-dependent loss of C1 activity: collagenase; pepsin; carboxypeptidase B. Third, enzymes which have no effect on C1 and C1: Lysozyme; neuraminidase; beta-galactosidase; L-amino acid oxidase; arginase; streptokinase, and acetylcholinesterase.

journal_name

Immunobiology

journal_title

Immunobiology

authors

Heinz HP,Loos M

doi

10.1016/S0171-2985(83)80058-8

subject

Has Abstract

pub_date

1983-08-01 00:00:00

pages

175-85

issue

2

eissn

0171-2985

issn

1878-3279

pii

S0171-2985(83)80058-8

journal_volume

165

pub_type

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