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Reversion of anergy signatures in clonal CD21low B cells of mixed cryoglobulinemia after clearance of HCV viremia

Martina del Padre, Laura Todi, Milica Mitrevski, Ramona Marrapodi, Stefania Colantuono, Massimo Fiorilli, Milvia Casato and Marcella Visentini

Key points

  • Anergic features of B cells of mixed cryoglobulinemia rapidly reverse after eradication of HCV with direct-acting antivirals.

  • Phenotypic and functional features of virus-specific B cell exhaustion persist for several months after HCV eradication.

Abstract

Hepatitis C virus (HCV) causes mixed cryoglobulinemia (MC) by driving clonal expansion of IgM+CD27+ B cells. These cells display both the features of anergy induced by continual engagement of the B cell receptor (BCR), such as high expression of phosphorylated extracellular signal regulated kinase (pERK) and reduced lifespan, and of virus-specific exhaustion such as CD21low phenotype and defective response to ligation of BCR and Toll-like receptor 9 (TLR9). Usually MC regresses after eradication of HCV with interferon, whose immunomodulatory activity might contribute to this effect. We investigated phenotypic and functional changes in clonal B cells of MC patients with sustained virologic responses to direct-acting antivirals (DAA), which lack immunomodulatory properties. We found that high pERK expression and accelerated apoptosis revert within 4 weeks after beginning therapy, whereas clonal B cells unresponsive to TLR9 stimulation persist for at least 24 weeks although they may partially rescue normal CD21 expression. Thus, similar to mouse models, features of anergy in MC B cells rapidly revert after disengagement from HCV, whereas virus-specific exhaustion imparts a durable inhibitory imprint on cell function. Treatment of HCV+ MC with DAA provides a valuable tool for untangling the molecular mechanisms of anergy and exhaustion in human B cells.

  • Submitted March 2, 2017.
  • Accepted May 10, 2017.