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MicroRNA-490 (miR-490) produces two mature
strands, miR-490-3p and miR-490-5p, which
can regulate different messenger-RNA targets and should be recorded
separately whenever the study identifies the strand. In many cancers,
miR-490 ↓ is the more commonly reported pattern, and
both miR-490-3p and miR-490-5p frequently function as tumour-suppressive
microRNAs. Restoration or miR-490 ↑ has been associated
with reduced proliferation, migration, invasion, epithelial-mesenchymal
transition, tumour growth, and treatment resistance, together with increased
apoptosis in susceptible cancer models. Reported targets include
CCND1, ERGIC3, VDAC1,
c-FOS, and other tumour- and strand-specific genes.
However, oncogenic activity has been reported for miR-490-3p in selected
settings, including some hepatocellular carcinoma models. The typical cancer-associated direction is
miR-490 ↓, while treatment-induced
miR-490 ↑ is usually interpreted as beneficial.
Cancer review;
miR-490-3p colorectal cancer study.
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