Radiation-Induced Loss of Salivary Gland Function Is Driven by Cellular Senescence and Prevented by IL6 Modulation

衰老 唾液腺 DNA损伤 癌症 放射治疗 癌症研究 头颈部癌 生物 表型 内科学 内分泌学 医学 病理 DNA 基因 遗传学
作者
Yitzhak Marmary,Revital Adar,Svetlana Gaska,Annette Wygoda,Alexander Maly,Jonathan Cohen,Ron Eliashar,Lina Mizrachi,Carmit Orfaig-Geva,Bruce J. Baum,Stefan Rose‐John,Eithan Galun,Jonathan H. Axelrod
出处
期刊:Cancer Research [American Association for Cancer Research]
卷期号:76 (5): 1170-1180 被引量:110
标识
DOI:10.1158/0008-5472.can-15-1671
摘要

Abstract Head and neck cancer patients treated by radiation commonly suffer from a devastating side effect known as dry-mouth syndrome, which results from the irreversible loss of salivary gland function via mechanisms that are not completely understood. In this study, we used a mouse model of radiation-induced salivary hypofunction to investigate the outcomes of DNA damage in the head and neck region. We demonstrate that the loss of salivary function was closely accompanied by cellular senescence, as evidenced by a persistent DNA damage response (γH2AX and 53BP1) and the expression of senescence-associated markers (SA-βgal, p19ARF, and DcR2) and secretory phenotype (SASP) factors (PAI-1 and IL6). Notably, profound apoptosis or necrosis was not observed in irradiated regions. Signs of cellular senescence were also apparent in irradiated salivary glands surgically resected from human patients who underwent radiotherapy. Importantly, using IL6 knockout mice, we found that sustained expression of IL6 in the salivary gland long after initiation of radiation-induced DNA damage was required for both senescence and hypofunction. Additionally, we demonstrate that IL6 pretreatment prevented both senescence and salivary gland hypofunction via a mechanism involving enhanced DNA damage repair. Collectively, these results indicate that cellular senescence is a fundamental mechanism driving radiation-induced damage in the salivary gland and suggest that IL6 pretreatment may represent a promising therapeutic strategy to preserve salivary gland function in head and neck cancer patients undergoing radiotherapy. Cancer Res; 76(5); 1170–80. ©2016 AACR.
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