title: Short-chain fatty acids enhance nuclear receptor activity through mitogen-activated protein kinase activation and histone deacetylase inhibition.
abstract: In this study, we demonstrate that the pervasive xenobiotic methoxyacetic acid and the commonly prescribed anticonvulsant valproic acid, both short-chain fatty acids (SCFAs), dramatically increase cellular sensitivity to estrogens, progestins, and other nuclear hormone receptor ligands. These compounds do not mimic endogenous hormones but rather act to enhance the transcriptional efficacy of ligand activated nuclear hormone receptors by up to 8-fold in vitro and in vivo. Detailed characterization of their mode of action revealed that these SCFAs function as both activators of p42/p44 mitogen-activated protein kinase and as inhibitors of histone deacetylases at doses that parallel known exposure levels. Our results define a class of compounds that possess a dual mechanism of action and function as hormone sensitizers. These findings prompt an evaluation of previously unrecognized drug-drug interactions in women who are administered exogenous hormones while exposed to certain xenobiotic SCFAs. Furthermore, our study highlights the need to structure future screening programs to identify additional hormone sensitizers.
authors.affiliation: Department of Pharmacology and Cancer Biology, Duke University Medical Center, Durham, NC 27710, USA.
authors.forename: Michelle S
authors.initials: MS
authors.lastname: Jansen
authors.forename: Susan C
authors.initials: SC
authors.lastname: Nagel
authors.forename: Phillippa J
authors.initials: PJ
authors.lastname: Miranda
authors.forename: Edward K
authors.initials: EK
authors.lastname: Lobenhofer
authors.forename: Cynthia A
authors.initials: CA
authors.lastname: Afshari
authors.forename: Donald P
authors.initials: DP
authors.lastname: McDonnell
mesh_terms: D000085:Acetates / Q000494:pharmacology; D000818:Animals; D005232:Fatty Acids, Volatile / Q000378:metabolism*; D012739:Gonadal Steroid Hormones / Q000378:metabolism; D056572:Histone Deacetylase Inhibitors; D007166:Immunosuppressive Agents / Q000494:pharmacology; D051379:Mice; D020928:Mitogen-Activated Protein Kinases / Q000378:metabolism*; D018160:Receptors, Cytoplasmic and Nuclear / Q000378:metabolism*; D011980:Receptors, Progesterone / Q000187:drug effects; D015398:Signal Transduction / Q000502:physiology; D015262:Xenobiotics / Q000494:pharmacology
chemical_list: D000085:Acetates; D005232:Fatty Acids, Volatile; D012739:Gonadal Steroid Hormones; D056572:Histone Deacetylase Inhibitors; D007166:Immunosuppressive Agents; D018160:Receptors, Cytoplasmic and Nuclear; D011980:Receptors, Progesterone; D015262:Xenobiotics; D020928:Mitogen-Activated Protein Kinases; C013598:methoxyacetic acid