A novel role for the immunoproteasome in retinal function

Stacy A. Hussong, Heidi Roehrich, Rebecca J. Kapphahn, Marcela Maldonado, Machelle T. Pardue, Deborah A. Ferrington

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20 Citations (Scopus)

Abstract

Purpose. The immunoproteasome is a proteasome subtype with a well-characterized role in the immune system. The presence of high immunoproteasome concentrations in the photoreceptors and synaptic regions of the immune-privileged retina implies a role in visual transmission. In this study, immunoproteasome knockout (KO) mice lacking either one (lmp7-/-, L7) or two (lmp7-/-/mecl-1-/-, L7M1) catalytic subunits of the immunoproteasome were used to test the hypothesis that it is essential for the maintenance of normal retinal function. Methods. Wild-type (WT) and immunoproteasome KO mice lacking either one (L7) or two (L7M1) catalytic subunits of the immunoproteasome were studied to determine the importance of the immunoproteasome in maintaining normal retinal function and morphology. Changes in retinal morphology were assessed in mice 2 to 24 months of age. Retinal function was measured with electroretinography (ERG), and relative content of select retinal proteins was assessed by immunoblot analysis. Results. Retinal morphometry showed no major abnormalities in age-matched WT or KO mice. No significant difference was observed in the levels of proteins involved in vision transmission. ERGs from KO mice exhibited an approximate 25% decrease in amplitude of the dark- and light-adapted b-waves and faster dark-adapted b-wave implicit times. Conclusions. Immunoproteasome deficiency causes defects in bipolar cell response. These results support a previously unrecognized role for the immunoproteasome in vision transmission.

Original languageEnglish (US)
Pages (from-to)714-723
Number of pages10
JournalInvestigative Ophthalmology and Visual Science
Volume52
Issue number2
DOIs
StatePublished - Feb 1 2011

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Knockout Mice
Catalytic Domain
Electroretinography
Proteasome Endopeptidase Complex
Retina
Immune System
Proteins
Maintenance
Light

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A novel role for the immunoproteasome in retinal function. / Hussong, Stacy A.; Roehrich, Heidi; Kapphahn, Rebecca J.; Maldonado, Marcela; Pardue, Machelle T.; Ferrington, Deborah A.

In: Investigative Ophthalmology and Visual Science, Vol. 52, No. 2, 01.02.2011, p. 714-723.

Research output: Contribution to journalArticle

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