Increased plasma membrane expression of human follicle-stimulating hormone receptor by a small molecule thienopyr(im)idine.
A thienopyr(im)idine (Org41841) activates the luteinizing hormone (LH) receptor but does not compete with the natural ligand binding site and does not show agonistic action on the follicle-stimulating hormone receptor (hFSHR) at sub-millimolar concentrations. When this drug is preincubated at sub-micromolar concentrations with host cells expressing the hFSHR, and then washed out, binding analysis and assessment of receptor-effector coupling show that it increases plasma membrane expression of the hFSHR. Real-time PCR shows that this effect did not result from increased hFSHR mRNA accumulation. It is possible that Org41841 behaves as a pharmacoperone, a drug which increases the percentage of newly synthesized receptor routing to the membrane. Like pharmacoperones for other receptors, this drug was able to rescue a particular mutant hFSHR (A(189)V) associated with misrouting and endoplasmic reticulum retention, although other mutants could not be rescued. This is potentially the first member of the pharmacoperone drug class which binds at a site that is distinctive from the ligand binding site.
Oregon National Primate Research Center, Beaverton, OR 97006, USA.
Jo Ann
JA
Janovick
Guadalupe
G
Maya-Núñez
Alfredo
A
Ulloa-Aguirre
Ilpo T
IT
Huhtaniemi
James A
JA
Dias
Pieter
P
Verbost
P Michael
PM
Conn
D000818:Animals; D019556:COS Cells; D002462:Cell Membrane / Q000187:drug effects* / Q000378:metabolism; D002522:Chlorocebus aethiops; D004305:Dose-Response Relationship, Drug; D006801:Humans; D008954:Models, Biological; D011485:Protein Binding; D021381:Protein Transport / Q000187:drug effects; D011725:Pyridines / Q000378:metabolism / Q000494:pharmacology*; D011743:Pyrimidines / Q000378:metabolism / Q000494:pharmacology; D011962:Receptors, FSH / Q000235:genetics / Q000378:metabolism*; D011974:Receptors, LH / Q000819:agonists; D013876:Thiophenes / Q000378:metabolism / Q000494:pharmacology; D014162:Transfection
C510603:Org 41841; D011725:Pyridines; D011743:Pyrimidines; D011962:Receptors, FSH; D011974:Receptors, LH; D013876:Thiophenes; C446540:thienopyridine; C476003:thienopyrimidine