Potential conflict of interest: Nothing to report.
Vitamin D controls T cell activation: Implication for causal association between vitamin D deficiency and fibrosis in chronic hepatitis C†
Article first published online: 29 OCT 2010
Copyright © 2010 American Association for the Study of Liver Diseases
Volume 52, Issue 5, page 1864, November 2010
How to Cite
Shen, L. (2010), Vitamin D controls T cell activation: Implication for causal association between vitamin D deficiency and fibrosis in chronic hepatitis C. Hepatology, 52: 1864. doi: 10.1002/hep.23781
- Issue published online: 29 OCT 2010
- Article first published online: 29 OCT 2010
- Manuscript Accepted: 24 MAY 2010
- Manuscript Received: 23 MAY 2010
To the Editor:
Vitamin D deficiency has been proved to be associated with many chronic liver diseases. We read with great interest the recent article by Petta et al.1 in which they reported that low vitamin D serum level is related to severe fibrosis and low response to antiviral therapy in patients with genotype 1 (G1) chronic hepatitis C (CHC). The authors also provided important information that low serum vitamin D levels may possibly result from the reduced cytochrome P27A1 expression in patients with G1 CHC.1 However, further investigations are needed to understand the causal association between vitamin D deficiency and fibrosis in patients with CHC.
According to the recent significant finding that vitamin D is crucial to activating the immune defenses,2 I would like to propose that low serum vitamin D level may favor progression of fibrosis in patients with CHC. It was found that the killer cells of the immune system—human T cells—depend on vitamin D in order to be activated. Under the condition of vitamin D deficiency, T cells will not be able to react to and kill foreign pathogens in the body.2 Thus, it is conceivable that a low vitamin D serum level will make T cells remain inactive to hepatitis C virus and aggravate the fibrosis in patients with CHC.1 Moreover, in view of the prevalence of vitamin D deficiency in many chronic liver diseases,3, 4 the finding that vitamin D controls activation of human T cells has important implications for future studies concerning the potential role of vitamin D in the treatment of chronic liver diseases.
- 1Low vitamin D serum level is related to severe fibrosis and low responsiveness to interferon-based therapy in genotype 1 chronic hepatitis C. HEPATOLOGY 2010; 51: 1158–1167., , , , , , et al.
- 2Vitamin D controls T cell antigen receptor signaling and activation of human T cells. Nat Immunol 2010; 11: 344–349., , , , , .
- 3Osteodystrophy in patients with chronic hepatitis and liver cirrhosis. J Gastroenterol 1996; 31: 669–678., , , .
- 4Osteoporosis, mineral metabolism, and serum soluble tumor necrosis factor receptor p55 in viral cirrhosis. J Clin Endocrinol Metab 2004; 89: 4325–4330., , , , , .
Liang Shen PhD*, * Shandong Provincial Research Center for Bioinformatic Engineering and Technique, Shandong University of Technology, Zibo, China.