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Journal of Molecular Neuroscience

, Volume 54, Issue 3, pp 430–442 | Cite as

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

  • Brian Njaine
  • Maurício Rocha-Martins
  • Carlos H. Vieira-Vieira
  • Luiz D. Barbosa De-Melo
  • Rafael Linden
  • Karen Braas
  • Victor May
  • Rodrigo A. P. Martins
  • Mariana S. Silveira
Article

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.

Keywords

Klf4 Cell cycle Cyclin D1 Neuropeptide PACAP Retina 

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

Notes

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.

Conflict of Interest

There is no conflict of interest to declare.

Supplementary material

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ESM 1

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High Resolution Image (TIFF 21477 kb)

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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Brian Njaine
    • 1
    • 5
  • Maurício Rocha-Martins
    • 1
  • Carlos H. Vieira-Vieira
    • 1
  • Luiz D. Barbosa De-Melo
    • 2
  • Rafael Linden
    • 1
  • Karen Braas
    • 3
  • Victor May
    • 3
  • Rodrigo A. P. Martins
    • 4
  • Mariana S. Silveira
    • 1
  1. 1.Instituto de Biofísica Carlos Chagas FilhoUniversidade Federal do Rio de JaneiroRio de JaneiroBrazil
  2. 2.Departamento de BiotecnologiaInstituto Federal do Rio de Janeiro, IFRJRio de JaneiroBrazil
  3. 3.Department of Anatomy and NeurobiologyUniversity of Vermont College of MedicineBurlingtonUSA
  4. 4.Instituto de Ciências BiomédicasUniversidade Federal do Rio de JaneiroRio de JaneiroBrazil
  5. 5.Max-Planck-Institut für Herz- und LungenforschungBad NauheimGermany

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