TY - JOUR
T1 - Human papillomavirus-driven repression of NRF2 signalling confers chemo-radio sensitivity and predicts prognosis in head and neck squamous cell carcinoma
AU - Ramesh, Pushkal S.
AU - Bovilla, Venugopal R.
AU - Swamy, Vikas H.
AU - Manoli, Nandini N.
AU - Dasegowda, Krishnappa B.
AU - Siddegowda, Siddegowda M.
AU - Chandrashekarappa, Shilpa
AU - Somasundara, Vishveshwara M.
AU - Kabekkodu, Shama P.
AU - Rajesh, R.
AU - Devegowda, Devanand
AU - Thimmulappa, Rajesh K.
N1 - Funding Information:
Pushkal S. Ramesh (Ph.D. student) acknowledges the award of Senior Research Fellowship (08/721(0001)/2019-EMR-I) from Council of Scientific and Industrial Research (CSIR), Government of India . We acknowledge the infrastructure support grant provided by the Department of Science & Technology to CEMR Laboratory (CR-FST-LS-1/2018/178) and to the Department of Biochemistry (SR/FST/LS-1-539/2012) JSS Medical College, to JSS Academy of Higher Education & Research (PURSE/ SR /2021/81-(C)).
Publisher Copyright:
© 2023 Elsevier Inc.
PY - 2023/8/20
Y1 - 2023/8/20
N2 - Purpose: To investigate the role of NRF2 signalling in conferring superior prognosis in patients with HPV positive (HPV+ve) head & neck squamous cell carcinomas (HNSCC) compared to HPV negative (HPV−ve) HNSCC and develop molecular markers for selection of HPV+ve HNSCC patients for treatment de-escalation trials. Methods: NRF2 activity (NRF2, KEAP1, and NRF2-transcriptional targets), p16, and p53 levels between HPV+ve HNSCC and HPV−ve HNSCC in prospective and retrospective tumor samples as well as from TCGA database were compared. Cancer cells were transfected with HPV-E6/E7 plasmid to elucidate if HPV infection represses NRF2 activity and sensitizes to chemo-radiotherapy. Results: Prospective analysis revealed a marked reduction in expression of NRF2, and its downstream genes in HPV+ve tumors compared to HPV−ve tumors. A retrospective analysis by IHC revealed significantly lower NQO1 in p16high tumors compared to p16low tumors and the NQO1 expression correlated negatively with p16 and positively with p53. Analysis of the TCGA database confirmed low constitutive NRF2 activity in HPV+ve HNSCC compared to HPV−ve HNSCC and revealed that HPV+ve HNSCC patients with ‘low NQO1’ expression showed better overall survival compared to HPV+ve HNSCC patients with ‘high NQO1’ expression. Ectopic expression of HPV-E6/E7 plasmid in various cancer cells repressed constitutive NRF2 activity, reduced total GSH, increased ROS levels, and sensitized the cancer cells to cisplatin and ionizing radiation. Conclusion: Low constitutive NRF2 activity contributes to better prognosis of HPV+ve HNSCC patients. Co-expression of p16high, NQO1low, and p53low could serve as a predictive biomarker for the selection of HPV + ve HNSCC patients for de-escalation trials.
AB - Purpose: To investigate the role of NRF2 signalling in conferring superior prognosis in patients with HPV positive (HPV+ve) head & neck squamous cell carcinomas (HNSCC) compared to HPV negative (HPV−ve) HNSCC and develop molecular markers for selection of HPV+ve HNSCC patients for treatment de-escalation trials. Methods: NRF2 activity (NRF2, KEAP1, and NRF2-transcriptional targets), p16, and p53 levels between HPV+ve HNSCC and HPV−ve HNSCC in prospective and retrospective tumor samples as well as from TCGA database were compared. Cancer cells were transfected with HPV-E6/E7 plasmid to elucidate if HPV infection represses NRF2 activity and sensitizes to chemo-radiotherapy. Results: Prospective analysis revealed a marked reduction in expression of NRF2, and its downstream genes in HPV+ve tumors compared to HPV−ve tumors. A retrospective analysis by IHC revealed significantly lower NQO1 in p16high tumors compared to p16low tumors and the NQO1 expression correlated negatively with p16 and positively with p53. Analysis of the TCGA database confirmed low constitutive NRF2 activity in HPV+ve HNSCC compared to HPV−ve HNSCC and revealed that HPV+ve HNSCC patients with ‘low NQO1’ expression showed better overall survival compared to HPV+ve HNSCC patients with ‘high NQO1’ expression. Ectopic expression of HPV-E6/E7 plasmid in various cancer cells repressed constitutive NRF2 activity, reduced total GSH, increased ROS levels, and sensitized the cancer cells to cisplatin and ionizing radiation. Conclusion: Low constitutive NRF2 activity contributes to better prognosis of HPV+ve HNSCC patients. Co-expression of p16high, NQO1low, and p53low could serve as a predictive biomarker for the selection of HPV + ve HNSCC patients for de-escalation trials.
UR - http://www.scopus.com/inward/record.url?scp=85162162291&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85162162291&partnerID=8YFLogxK
U2 - 10.1016/j.freeradbiomed.2023.06.011
DO - 10.1016/j.freeradbiomed.2023.06.011
M3 - Article
C2 - 37328018
AN - SCOPUS:85162162291
SN - 0891-5849
VL - 205
SP - 234
EP - 243
JO - Free Radical Biology and Medicine
JF - Free Radical Biology and Medicine
ER -
