title: Positive allosteric modulators of the metabotropic glutamate receptor subtype 4 (mGluR4). Part II: Challenges in hit-to-lead.
abstract: This Letter describes the synthesis and SAR of two mGluR4 positive allosteric modulator leads, 6 and 7. VU001171 (6) represents the most potent (EC(50)=650 nM), efficacious (141% Glu Max) and largest fold shift (36-fold) of any mGluR4 PAM reported to date. However, this work highlights the challenges in hit-to-lead for mGluR4 PAMs, with multiple confirmed HTS hits displaying little or no tractable SAR.
authors.affiliation: Department of Pharmacology, Vanderbilt University Medical Center, Nashville, TN 37232, USA.
authors.forename: Richard
authors.initials: R
authors.lastname: Williams
authors.forename: Colleen M
authors.initials: CM
authors.lastname: Niswender
authors.forename: Qingwei
authors.initials: Q
authors.lastname: Luo
authors.forename: Uyen
authors.initials: U
authors.lastname: Le
authors.forename: P Jeffrey
authors.initials: PJ
authors.lastname: Conn
authors.forename: Craig W
authors.initials: CW
authors.lastname: Lindsley
mesh_terms: D000494:Allosteric Regulation; D000495:Allosteric Site; D000818:Animals; D016466:CHO Cells; D002626:Chemistry, Pharmaceutical / Q000379:methods*; D006224:Cricetinae; D003412:Cricetulus; D004305:Dose-Response Relationship, Drug; D015195:Drug Design; D004353:Drug Evaluation, Preclinical; D008956:Models, Chemical; D008968:Molecular Conformation; D018094:Receptors, Metabotropic Glutamate / Q000378:metabolism*; D013329:Structure-Activity Relationship
chemical_list: D018094:Receptors, Metabotropic Glutamate; C108823:metabotropic glutamate receptor 4