microRNA-422a (miR-422a)

microRNA-422a (miR-422a) is a small, endogenous non-coding RNA that inhibits expression of target genes by binding to sequence elements within the 3′ untranslated regions (UTRs) of messenger RNAs, thereby destabilizing these transcripts or suppressing their translation[3]. It is naturally derived from a short interspersed nuclear element (SINE) and can interact with gene exonic regions and regulatory factors such as NF-E2[3]. miR-422a demonstrates pronounced tumor suppressor properties by inhibiting cell proliferation, migration, invasion, and promoting cell cycle arrest and apoptosis in cancer cells. Its downregulation has been linked to higher tumor grade, increased metastasis, and poorer prognosis in cancer patients[1][2][4]. It also participates in cellular metabolism regulation, particularly in the metabolic reprogramming of tumors, and serves as a biomarker for cancer diagnosis and prognosis[1][2][4]. No currently approved drugs specifically target miR-422a, but its restoration via mimics or inhibition via antagonists are under research as potential therapeutic strategies against multiple cancers[1][2][3]. Safety and delivery challenges remain barriers to clinical translation of miRNA-based therapeutics.

Other names

hsa-miR-422aMIRN422AMIR422AmiR-422a

For mimics: Restoration of miR-422a function leads to downregulation of oncogenes (e.g., PDK2, RPN2, IGF1, FOXQ1, PIK3CA), suppression of proliferation, invasion, migration, and induction of apoptosis in cancer cells[1][2]. For inhibitors: Loss of miR-422a function increases expression of oncogenic targets, promoting tumor growth and metastasis[1][2].