MicroRNA-99 family in cancer and immunity

Area of Science:

• Molecular Biology
• Immunology
• Genetics

Background:

• The microRNA (miR)-99 family, including miR-99a, miR-99b, and miR-100, is evolutionarily conserved, predating bilaterians.
• Members exhibit context-dependent roles in cancer, acting as oncogenes in leukemia but as tumor suppressors or promoters in other cancers.
• Their targets include both oncogenes and tumor suppressors, highlighting their complex regulatory functions.

Purpose of the Study:

• To review current knowledge on the miR-99 family's roles in cancer and immunity.
• To discuss the dual functions of miR-99 family members as oncogenic miRs (oncomiRs) and tumor-suppressing miRs (TSmiRs).
• To explore the implications of miR-99 family activities in immune responses, including macrophage and T-cell biology.

Main Methods:

• Literature review of existing research on the miR-99 family.
• Analysis of studies investigating miR-99 family targets in cancer.
• Examination of research on miR-99 family's influence on immune cell function and inflammatory responses.

Main Results:

• The miR-99 family displays context-specific oncogenic or tumor-suppressive activities in various cancers.
• This miR family plays a critical role in modulating macrophage inflammatory responses and T-cell subset biology.
• Dysregulation of the miR-99 family is implicated in maintaining tissue homeostasis and immune tolerance.

Conclusions:

• A deeper understanding of the miR-99 family's functions in cancer and immunity is crucial.
• Further research can pave the way for developing novel miR-99-based therapeutics for cancer and immune-related diseases.
• Targeting the miR-99 family holds promise for treating human malignancies and inflammatory conditions.