title: Localization and phenotype-specific expression of ryanodine calcium release channels in C57BL6 and DBA/2J mouse strains.
abstract: The DBA/2J (D2) and C57BL6 (B6) mouse strains are widely used in research as models for anxiety, addiction and chronic glaucoma. D2, but not B6, animals develop elevated intraocular pressure (IOP) that leads to progressive degeneration of retinal ganglion cell (RGC) axons and perikarya. Here we compare the expression and localization of intracellular ryanodine receptor (RyR) Ca(2+) store mechanisms in retinas from D2 and B6 animals. A subset of experiments included retinas from D2-Gpnmb(+) mice as strain-specific controls for D2s. RT-PCR analysis showed 6-8 -fold upregulation RyR1, but not RyR2 or RyR3 transcripts, in D2 retinas. The upregulation was more pronounced in D2 retinas categorized as exhibiting moderate or severe glaucoma eyes compared to eyes with no/little glaucoma. In B6 retinas, RyR1 was expressed in neuronal perikarya/processes across all three retinal layers whereas little labeling was observed in astrocyte, microglial or Müller cell processes. In contrast, RyR1 antibodies strongly labeled radial processes of in D2 Müller glia, in which the staining colocalized with the activated glial stress marker GFAP. RyR1 staining in 1 month-old D2-Gpnmb(+) strain resembled expression in B6 retinas whereas moderate RyR1, but not GFAP, localization to Müller glia was observed in 10-12 months - old D2-Gpnmb(+) eyes. Both RyR1-ir and GFAP-ir were augmented in the microbead injection model of acute experimental glaucoma. We conclude that RyR1 exhibits differential expression and localization in two ubiquitously used mouse lines. While RyR1 signals can be regulated in a strain-specific manner, our data also suggest that RyR1 transcription is induced by early glial activation and/or elevation in intraocular pressure.
authors.affiliation: Department of Ophthalmology & Visual Sciences, John A. Moran Eye Center, University of Utah School of Medicine, Salt Lake City, UT 84132, USA.
authors.forename: Wei
authors.initials: W
authors.lastname: Huang
authors.forename: Wei
authors.initials: W
authors.lastname: Xing
authors.forename: Daniel A
authors.initials: DA
authors.lastname: Ryskamp
authors.forename: Claudio
authors.initials: C
authors.lastname: Punzo
authors.forename: David
authors.initials: D
authors.lastname: Križaj
mesh_terms: D000818:Animals; D002460:Cell Line; D019084:Fluorescent Antibody Technique, Indirect; D005786:Gene Expression Regulation / Q000502:physiology*; D005904:Glial Fibrillary Acidic Protein; D017403:In Situ Hybridization; D051379:Mice; D008810:Mice, Inbred C57BL; D008811:Mice, Inbred DBA; D009419:Nerve Tissue Proteins / Q000378:metabolism; D010641:Phenotype; D012333:RNA, Messenger / Q000378:metabolism; D012160:Retina / Q000378:metabolism*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D019837:Ryanodine Receptor Calcium Release Channel / Q000235:genetics* / Q000378:metabolism*; D013047:Specific Pathogen-Free Organisms; D014065:Tonometry, Ocular; D015854:Up-Regulation
chemical_list: D005904:Glial Fibrillary Acidic Protein; D009419:Nerve Tissue Proteins; D012333:RNA, Messenger; D019837:Ryanodine Receptor Calcium Release Channel; C528900:glial fibrillary astrocytic protein, mouse