Heterogeneous nuclear ribonucleoprotein D (HNRNPD) (HNRNPD)

Heterogeneous nuclear ribonucleoprotein D (HNRNPD), widely known as AU-rich element RNA-binding factor 1 (AUF1), is a versatile RNA-binding protein that plays a critical role in post-transcriptional gene regulation [6, 15]. It primarily binds with high affinity to adenosine-uridine-rich elements (AREs) located in the 3' untranslated regions (UTRs) of many short-lived mRNAs, such as those encoding cytokines, proto-oncogenes, and cell cycle regulators [6, 13]. By recruiting the exosome and other decay machinery, AUF1 typically facilitates the rapid degradation of these transcripts, although it can also stabilize certain targets or regulate their translation depending on the cellular context and the specific isoform involved (p37, p40, p42, or p45) [15, 16]. Beyond its role in mRNA turnover, AUF1 is involved in telomere maintenance through interactions with telomeric DNA and RNA, and it has been implicated in the transcriptional regulation of specific genes such as complement receptor 2 [15]. In disease contexts, AUF1 is frequently dysregulated; its overexpression is linked to various malignancies, including esophageal and liver cancers, where it promotes cell proliferation and survival by altering the stability of oncogenic transcripts [7, 15]. It also plays a key role in chronic inflammatory conditions and autoimmune disorders by regulating the expression of pro-inflammatory cytokines like TNF-alpha and IL-6 [15]. Although it is considered a promising therapeutic target for modulating gene expression patterns in cancer and inflammation, its ubiquitous expression across tissues and involvement in fundamental cellular processes like telomere maintenance pose significant challenges for the development of selective inhibitors [7, 15]. Currently, no drugs specifically targeting AUF1 have reached advanced clinical development, though research into small molecules and targeted degradation strategies is ongoing [8, 15].

Other names

AU-rich element RNA-binding protein 1AU-rich RNA-binding factor 1AUF1HNRPDHeterogeneous nuclear ribonucleoprotein D0ARE-binding protein AUF1p37AUF1p40AUF1p42AUF1p45AUF1

There are currently no approved drugs targeting HNRNPD. Endogenously, AU-rich RNA-binding factor 1 (AUF1) regulates gene expression by binding to AU-rich elements (AREs) in the 3' untranslated regions of target mRNAs and recruiting the exosome and other mRNA decay machinery to promote rapid transcript degradation.