M3-muscarinic receptor subtype predominates in the bovine iris sphincter smooth muscle and ciliary processes.
The distribution of mRNAs encoding muscarinic acetylcholine receptor (mAChR) subtypes (M1, M2, M3, and M4) was investigated in the bovine iris-ciliary body by Northern blot hybridization with subtype-specific oligonucleotide probes that were complementary to unique regions of the M1, M2, M3, and M4 mAChRs. Whole rat brain RNA, which contains all four subtypes, was employed as a positive control. Both the iris sphincter and the ciliary processes were found to contain predominantly the M3 mAChR subtype and minor amounts of the M2 subtype. Traces of the M4 subtype were detected also in the ciliary processes.
Department of Cell and Molecular Biology, Medical College of Georgia, Augusta.
R E
RE
Honkanen
E F
EF
Howard
A A
AA
Abdel-Latif
D000818:Animals; D015152:Blotting, Northern; D001923:Brain Chemistry; D002417:Cattle; D002924:Ciliary Body / Q000032:analysis*; D007498:Iris / Q000032:analysis*; D009130:Muscle, Smooth / Q000032:analysis*; D009693:Nucleic Acid Hybridization; D015345:Oligonucleotide Probes; D011061:Poly A / Q000032:analysis; D012313:RNA / Q000032:analysis; D012333:RNA, Messenger / Q000032:analysis*; D051381:Rats; D011919:Rats, Inbred Strains; D011976:Receptors, Muscarinic / Q000032:analysis*
D015345:Oligonucleotide Probes; D012333:RNA, Messenger; D011976:Receptors, Muscarinic; D011061:Poly A; D012313:RNA