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IgG subclasses in cryoglobulins: link to composition and clinical manifestations.


ABSTRACT: BACKGROUND:Cryoglobulins (CG) are immunoglobulins which precipitate at low temperature. The analysis of IgG subclass composition of CG is poorly reported. The aim of this study was to determine the subclasses of IgG-containing type I and mixed type II and III CG in relation to clinical manifestations. METHODS:Out of a previous series of 1675 patients, inclusion criteria were a cryoprecipitate >?1?mL and a total IgG?>?300?mg/L. IgG subclasses were quantified by immunoturbidimetry, rheumatoid factor (RF), and C4 by immunonephelometry. Clinical parameters were collected from hospital charts. RESULTS:CG samples from 86 patients were included, 10 type I CG and 76 mixed CG. Type I CG subclasses were IgG1 (6/10) and IgG2/IgG3 (4/10), never IgG4. IgG subclass in type II vs. III CG were 73.3?±?15.2% vs. 52.5?±?20.7% for IgG1 (p?

SUBMITTER: Kolopp-Sarda MN 

PROVIDER: S-EPMC7659205 | biostudies-literature | 2020 Nov

REPOSITORIES: biostudies-literature

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IgG subclasses in cryoglobulins: link to composition and clinical manifestations.

Kolopp-Sarda Marie N MN   Azevedo Pedro Ming PM   Miossec Pierre P  

Arthritis research & therapy 20201112 1


<h4>Background</h4>Cryoglobulins (CG) are immunoglobulins which precipitate at low temperature. The analysis of IgG subclass composition of CG is poorly reported. The aim of this study was to determine the subclasses of IgG-containing type I and mixed type II and III CG in relation to clinical manifestations.<h4>Methods</h4>Out of a previous series of 1675 patients, inclusion criteria were a cryoprecipitate > 1 mL and a total IgG > 300 mg/L. IgG subclasses were quantified by immunoturbidimetry,  ...[more]

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