MIR503 host gene (MIR503HG)

MIR503 host gene (MIR503HG) is a long noncoding RNA located on chromosome Xq26.3, functioning as a tumor suppressor and regulator of key cellular processes including proliferation, migration, invasion, and apoptosis. MIR503HG acts independently or in cooperation with its hosted microRNAs (especially miR-503) and mediates effects through direct protein interactions (e.g., HNRNPA2B1) and modulation of key signaling pathways (NF-κB, TGF-β, ERK/MAPK, PI3K/AKT). It is downregulated in several human cancers and is under investigation as a prognostic, diagnostic, and therapeutic target, with roles in non-malignant diseases such as diabetic nephropathy and placental disorders. Its impact is exerted via a combination of transcriptional, translational, and post-translational mechanisms, acting as a key player in the regulation of cellular homeostasis and disease progression.

Other names

H19 X-linked co-expressed lncRNAH19XMGC16121

In cancers, upregulation of MIR503HG suppresses metastasis and cell migration, primarily via inhibition of the NF-κB pathway, promoting ubiquitin-mediated degradation of HNRNPA2B1, and thereby destabilizing mRNAs (e.g., p52, p65) and blocking downstream signaling. In diabetic nephropathy, it promotes cell apoptosis via miR-503-dependent regulation of Bcl-2 and mitochondrial apoptosis pathway. In preeclampsia, overexpression induces apoptosis and cell cycle arrest in trophoblasts.