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Chapter 60

Functional Changes in Inner Retinal Neurons

in Animal Models of Photoreceptor

Degeneration

Theresa Puthussery and W. Rowland Taylor

Abstract Retinitis Pigmentosa (RP) refers to a heterogeneous group of inherited disorders that result in the death of rod and cone photoreceptors. There is now abundant evidence to suggest that inner retinal neurons, particularly the bipolar and horizontal cells, undergo significant morphological changes and changes in neurotransmitter receptor expression in response to photoreceptor degeneration. Some of these alterations could impact the choice and success of intervention strategies for these conditions, and it is therefore necessary to understand the timing and nature of any functional deficits resulting from degenerative changes. This paper will review the evidence for functional alterations in the inner retina in animal models of (RP), with particular emphasis on the bipolar and ganglion cells.

60.1 Introduction

Retinitis Pigmentosa comprises a large group of inherited disorders that result in the progressive degeneration of rod, and subsequently cone, photoreceptors. It was initially believed that photoreceptors were exclusively affected by the condition, since the thickness of the inner nuclear layer appears unchanged even at late stages in the degenerative process. It is now well established that the second order neurons, the bipolar and horizontal cells, undergo dramatic morphological changes in the outer plexiform layer in response to photoreceptor death, showing extensive dendritic retraction and remodelling (Strettoi and Pignatelli 2000; Gargini et al. 2007). Moreover, there is evidence for cell body migration, in the case of rod bipolar cells (Gargini et al. 2007), and changes in expression of neurotransmitter receptors (see Marc et al. (2003) for detailed review). Careful quantification has revealed that some

T. Puthussery (B)

Department of Ophthalmology, Casey Eye Institute, Oregon Health & Science University, Portland, OR, USA

e-mail: puthusse@ohsu.edu

R.E. Anderson et al. (eds.), Retinal Degenerative Diseases, Advances in Experimental

525

Medicine and Biology 664, DOI 10.1007/978-1-4419-1399-9_60,C Springer Science+Business Media, LLC 2010