The ambiguous role of sirtuins in head and neck squamous cell carcinoma

Area of Science:

• Molecular Biology
• Oncology
• Biochemistry

Background:

• Oral cancer is a significant cause of mortality and morbidity worldwide.
• Sirtuins (SIRTs), a class of histone deacetylases, regulate cellular processes implicated in various cancers.
• The specific roles of sirtuins in oral cancer pathogenesis are not fully elucidated, presenting a knowledge gap.

Purpose of the Study:

• To review and synthesize current knowledge on the roles of sirtuins in oral cancer.
• To highlight the ambiguous and understudied functions of specific sirtuins, such as SIRT1, SIRT2, SIRT3, and SIRT7, in oral malignancies.
• To underscore the importance of understanding sirtuin regulatory mechanisms for developing targeted oral cancer therapies.

Main Methods:

• Literature review and synthesis of existing research on sirtuins and oral cancer.
• Analysis of reported functions of SIRT1, SIRT2, SIRT3, and SIRT7 in oral cancer cells and tissues.
• Identification of conflicting or incomplete findings regarding sirtuin roles in oral carcinogenesis.

Main Results:

• SIRT1 exhibits a dual role in oral cancer, acting as both a tumor suppressor and potentially a carcinogen, leading to ambiguous findings.
• SIRT3 expression correlates with oral malignancies, but its precise role, whether pro- or anti-cancer, requires further investigation.
• SIRT7 loss is observed in oral cancer, and its overexpression demonstrates tumor-suppressive effects on proliferation, migration, and invasiveness.
• The roles of other sirtuins in oral cancer remain largely unstudied or poorly reported.

Conclusions:

• The functions of sirtuins, particularly SIRT1, SIRT3, and SIRT7, in oral cancer are complex and context-dependent.
• Further research is essential to clarify the precise mechanisms by which sirtuins influence oral cancer development and progression.
• Elucidating these regulatory pathways could pave the way for novel therapeutic strategies against oral cancer.