Abstract
Ano-genital warts are considered one of the commonest and highly infectious sexually transmitted infections. These warts are primarily caused by the human papillomavirus (HPV) of the family Papillomaviridae, genus alpha-papillomavirus, species 10 and types 6 and 11. However the high recurrence rate of warts is a matter of serious concern to the patients and a challenge for the treating physician. The conventional treatment options are targeted only to the local site of warts. There is no systemic treatment modality as there is limited understanding of the disease immune-pathogenesis. The role of cell-mediated immunity in combating HPV infection is not clearly defined. Hence the present study is aimed at investigating the CD4+ T helper (Th1 and Th2) and CD8+ T cell responses among wart patients. In this study, we compared HPV6 and HPV11 antigen-specific T cell responses among venereal wart patients relative to healthy controls. Significant decrease in percent frequencies of IFN-γ producing CD4+ and CD8+ T cells were observed in HPV infected wart patients. On the other hand, the frequency of CD4+ T cells expressing IL-4 was significantly increased in these patients as compared to healthy controls. The observed functional skewing of HPV specific T cells from Th1 to Th2 response in patients indicated suppressed immunity against the HPV. Moreover, decrease in CD8 T cell function correlated with poor wart clearance. Our findings open future avenues for exploring potential immunomodulation strategies as an adjunct to standard treatment for better management of these patients and prevention of recurrence.
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Acknowledgements
The authors hereby acknowledge the valuable contribution of Junior and Senior Residents of Department of Dermatology, Dr. Ram Manohar Lohia Hospital, New Delhi for patient recruitment, Mr. N.P. Singh and Mr. Pankaj, Lab. technician, Abhinav Saurabh, Prabin and Girija, SRF, Department of Transplant Immunology and Immunogenetics, AIIMS for their laboratory support and Dr. Abha Agrawal, Former Scientist ‘F’, National Institute of Medical Statistics, New Delhi for statistical analysis.
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Hemanta Kumar Kar formerly affiliated at Dr. Ram Manohar Lohia Hospital, Baba Kharak Singh Marg, New Delhi 110001, India.
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Singh, M., Thakral, D., Rishi, N. et al. Functional characterization of CD4 and CD8 T cell responses among human papillomavirus infected patients with ano-genital warts. VirusDis. 28, 133–140 (2017). https://doi.org/10.1007/s13337-017-0382-8
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DOI: https://doi.org/10.1007/s13337-017-0382-8