Wednesday, January 15, 2025
1/15/2025
A novel lncRNA-responsive and xenobiotic receptor-mediated regulation of drug metabolism and disposition Abstract Drug metabolism and disposition are essential xenobiotic responses. The long non-coding RNAs (lncRNAs) are non-coding RNAs larger than 200 nucleotides (nt) in length and do not have protein-coding potentials. Although many of the biological functions of lncRNAs have been recognized, it is unclear whether and how lncRNAs can regulate the expression of drug-metabolizing enzymes and transporters and if so, whether the regulations are implicated in cancer chemo-resistance. Through integrative analysis of cancer non-coding genomic and high-through drug screening data of 505 cancer cell lines, our preliminary study have discovered and functionally characterized a group of ADME(drug absorption, distribution, metabolism, and excretion) chemo-resistance lncRNAs, including LINC00992, whose up-regulation is associated with resistance to more than 100 chemotherapy compounds and may regulate drug-metabolizing enzymes and transporters through interacting with xenobiotic nuclear receptor. We hypothesize that dysregulation of ADME chemo-resistance lncRNAs is an important contributor for the development of cancer chemo-resistance. Mechanistically, ADME chemo-resistance lncRNAs affect chemo-resistance through their regulation of drug-metabolizing enzymes and transporters that are responsible for the metabolism and disposition of chemotherapy drugs. We propose three specific aims to test our hypotheses: In Aim 1, we will perform bioinformatic analysis and molecularly clone of lncRNAs associated with cancer chemo-resistance and clinical prognosis. In Aim 2: we will functional characterize of ADME chemo-resistance lncRNAs, including LINC00992, using in vivo and in vitro cancer chemotherapy models. In Aim 3: we will determine the mechanism by which ADME chemo-resistance lncRNAs, including LINC00992, regulate the expression of drug-metabolizing enzymes and transporters. Chemotherapy remains a mainstay in the clinical management of cancer patients, but chemo-resistance is a major challenge to overcome. Understanding the novel lncRNA responsive and xenobiotic nuclear receptor- mediated chemo-resistance will help provide novel strategies to enhance therapeutic efficacy and avoid the development of chemo-resistance.
HHS’ Tracking Accountability in Government Grants System (TAGGS) website provides access to detailed descriptions of grants, loans, aggregated direct payments and other types of financial assistance awarded by the HHS Operating Divisions (OPDIVs) and the Office of the Secretary Staff Divisions (STAFFDIVs).