title: Effect of the M1 Muscarinic Acetylcholine Receptor on Retinal Neuron Number Studied with Gene-Targeted Mice.
abstract: Pharmacological activation of the M1 muscarinic receptor subtype was suggested to promote the survival of retinal neurons. We examined the hypothesis that the M1 receptor is crucial for retinal neuron survival in vivo by using mice devoid of the M1 receptor gene. Muscarinic receptor gene expression was determined in the retina using real-time PCR. The amount of neurons in the retinal ganglion cell layer and of axons in the optic nerve was determined in retinal wholemounts stained with cresyl blue and in optic nerve cross-sections stained with toluidine blue, respectively. mRNA of all five muscarinic receptor subtypes (M1-M5) was detected in the retina from wild-type mice. Remarkably, M2 and M3 receptor mRNA were most abundant. In retinas from M1 receptor-deficient mice, M4 receptor mRNA expression was increased compared to that of wild-type mice, while no marked changes in the mRNA expression levels of the other muscarinic receptor subtypes were observed. The amount of cells in the retinal ganglion cell layer and the amount of axons in the optic nerve did not differ between M1 receptor-deficient and wild-type mice. The present findings suggest that the M1 receptor is not essential for the survival of retinal neurons in vivo.
authors.affiliation: Department of Ophthalmology, University Medical Center, Johannes Gutenberg University Mainz, Langenbeckstr. 1, 55131, Mainz, Germany, panoslaspas@gmail.com.
authors.forename: Panagiotis
authors.initials: P
authors.lastname: Laspas
authors.forename: Jan J
authors.initials: JJ
authors.lastname: Sniatecki
authors.forename: Christoph
authors.initials: C
authors.lastname: Brochhausen
authors.forename: Andreas
authors.initials: A
authors.lastname: Steege
authors.forename: Evgeny
authors.initials: E
authors.lastname: Goloborodko
authors.forename: Marcin L
authors.initials: ML
authors.lastname: Kordasz
authors.forename: Franz H
authors.initials: FH
authors.lastname: Grus
authors.forename: Norbert
authors.initials: N
authors.lastname: Pfeiffer
authors.forename: Adrian
authors.initials: A
authors.lastname: Gericke
mesh_terms: D000818:Animals; D051379:Mice; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D043643:Receptor, Muscarinic M1 / Q000235:genetics* / Q000378:metabolism; D012165:Retinal Ganglion Cells / Q000166:cytology* / Q000378:metabolism
chemical_list: D012333:RNA, Messenger; D043643:Receptor, Muscarinic M1