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Pleiotropic Functions of Pituitary Adenylyl Cyclase-Activating Polypeptide on Retinal Ontogenesis: Involvement of KLF4 in the Control of Progenitor Cell Proliferation

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Abstract

We showed previously that the neuropeptide pituitary adenylyl cyclase-activating polypeptide (PACAP) negatively regulates proliferation of postnatal rat retinal progenitor cells through the downregulation of cyclin D1 in a cAMP/protein kinase A dependent manner. In the present study, we describe by microarray analysis several putative PACAP targets regulated by different transcription factor families. One of these families is the Sp/Klf family of transcriptional factors capable of regulating cyclin D1, and among members, we demonstrate by immunocytochemistry that KLF4 is expressed throughout rat retinal development by retinal progenitor cells and in most differentiated cell types. Using retinal explants preparations, PACAP treatment can transiently increase Klf4 mRNA levels; from electrophoretic mobility shift assays, PACAP is also able to increase the nuclear KLF4 content. From these results, we suggest that KLF4 may be involved in the anti-proliferative effects of PACAP as one mechanism regulating progenitor cell transition from proliferation to differentiation throughout retinal development.

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Abbreviations

KLF:

Kruppel-like factor

BrdU:

5-Bromo-2-deoxyuridine

CREB:

cAMP response element-binding protein

RPCs:

Retinal progenitor cells

DPM:

Disintegrations per minute

GCL:

Ganglion cell layer

HRP:

Horseradish peroxidase

INL:

Inner cell layer

PAC1:

Pituitary adenylyl cyclase activating polypeptide-specific receptor

PACAP:

Pituitary adenylyl cyclase-activating polypeptide

PCNA:

Proliferating cell nuclear antigen

pCREB:

Phosphorylated cAMP response element-binding protein

PKA:

cAMP-dependent protein kinase (protein kinase A)

qRT-PCR:

Quantitative real-time polymerase chain reaction

Shh:

Sonic hedgehog

VIP:

Vasoactive intestinal peptide

VPAC:

Receptor activated by both pituitary adenylyl cyclase-activating polypeptide and vasoactive intestinal peptide

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Acknowledgments

We thank José Nilson dos Santos, José Francisco Tibúrcio, Damaris Sincorá, Gildo Brito de Souza, and Talita Martins for technical assistance and the Bioinformatics Core Facility at University of Vermont, USA. Support for the University of Vermont Neuroscience Core Facility from NIH NCRR P30RR032135/NIGMS P30GM103498 is also gratefully acknowledged. This investigation was supported by grants from CAEN/International Society for Neurochemistry, CNPq, and FAPERJ.

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There is no conflict of interest to declare.

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Correspondence to Mariana S. Silveira.

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Brian Njaine and Maurício Rocha-Martins contributed equally to this work.

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Njaine, B., Rocha-Martins, M., Vieira-Vieira, C.H. et al. Pleiotropic Functions of Pituitary Adenylyl Cyclase-Activating Polypeptide on Retinal Ontogenesis: Involvement of KLF4 in the Control of Progenitor Cell Proliferation. J Mol Neurosci 54, 430–442 (2014). https://doi.org/10.1007/s12031-014-0299-2

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