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[Cryoglobulinemia and hepatitis C virus]
1Laboratoire de biochimie, hôpital Broussais, Paris, France.
Insights
Essential mixed cryoglobulinemia is linked to the hepatitis C virus (HCV). Advanced serologic tests and PCR detect HCV RNA in cryoprecipitates, aiding diagnosis.
Area of Science:
- Immunology
- Virology
Context:
- Cryoglobulins are proteins that precipitate in cold conditions.
- Essential mixed cryoglobulinemia (EMC) is a condition involving these proteins.
- Hepatitis C virus (HCV) is increasingly associated with EMC.
Purpose:
- To explore the association between Hepatitis C Virus and essential mixed cryoglobulinemia.
- To highlight advancements in diagnostic techniques for HCV in cryoglobulinemia.
Summary:
- Cryoglobulins are immunoglobulins precipitating at low temperatures, characterized by techniques like immunofixation.
- HCV association with EMC is noted, with varying frequencies possibly due to patient heterogeneity and improved serologic tests.
- HCV RNA detection via PCR in serum or cryoprecipitates is now feasible, complementing antibody tests.
Impact:
- Improved diagnostic capabilities for identifying HCV in patients with cryoglobulinemia.
- Enhanced understanding of the pathogenic role of HCV in cryoglobulinemic syndromes.
- Potential for better patient stratification and management strategies for HCV-associated cryoglobulinemia.
Abstract:
Cryoglobulins are immunoglobulins that precipitate at low temperatures. They are easy to characterize by using sensitive techniques such as immunofixation and immunoblotting. Recently, hepatitis C virus (HCV) has been found to be associated with essential mixed cryoglobulinemia. The different frequencies reported might be explained by heterogeneity in patient subpopulations and advances in serologic tests. In addition to commercial kits to detect HCV antibodies, polymerase chain reaction (PCR) of HCV RNA can now be applied to serum or cryoprecipitates. The pathogenic role of hepatitis C virus is well known, but the precise mechanism remains to be determined.