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Expression of TGF-β superfamily receptors in the retinal pigmented epithelium

Expressão de receptores da superfamília de TGF-β no epitélio pigmentário da retina

SUMMARY

Background:

Retinal pigment epithelial (RPE) cells play an important role in the inflammatory response of the eye. Trans-forming growth factor-beta (TGF-β) and other members of the TGF-β superfamily are described to regulate some RPE cells functions. In this study the expression of TGF-β superfamily receptors in RPE cells at mRNA level was investigated

Methods:

RT-PCR technique was performed using mRNAs from D407 RPE cells (human RPE cell line) and HaCatTcells (human keratinocyte cell line used as positive control).

Results:

Expression of 6 type 1 receptors (TGF-β type I receptor, ALK-1, Activin type I receptor, activin type IB receptor, BMP type SA receptor, BMP type IB receptor), and 4 type II receptors (TGF-β type lI receptor, activin type II receptor, activin type IIB receptor, BMP type II receptor) were studied. The results demonstrated that TGF-β, activins and BMPs express their own specific receptors at mRNA level.

Conclusions:

The present study suggests that TGF-β superfamily members can exert effects on D407 RPE cells through their specific receptors.

Key words:
TGF-β superfamily receptor; Retinal pigment epithelial cells; Polymerase chain reaction

RESUMO

Objetivo:

O epitélio pigmentário da retina (EPR) desempenha um importante papel na resposta inflamatória ocular. "Transforming growth factor-beta" (TGF-β) e outros membros de sua superfamília têm sido descritos como reguladores de certas funções do EPR. Neste estudo, os autores investigaram a expressão de receptores da superfamília de TGF-β superfamily nas células do EPR a nível de RNA mensageiro.

Métodos:

Técnica de RT-PCR foi usada com RNA mensageiro de D407 (linhagem de células do EPR humano) e HaCatT (linhagem de queratócitos humanos usados como controle positivo).

Resultados:

A expressão de 6 receptores tipo I (TGF-β receptor tipo I, ALK-I, activina receptor tipo I, activina receptor tipo IB, BMP receptor tipo IA, BMP receptor tipo IB), e 4 receptores tipo II (TGF-β receptor tipo II, activina receptor tipo II, activina receptor tipo IIB, BMP receptor tipo II) foi investigada. Os resultados demonstraram que TGF-β, activinas e BMPs expressam receptores específicos a nível de RNA mensageiro em células do EPR.

Conclusões:

O presente estudo sugere que membros da superfamília de TGF-β podem exercer efeitos nas células de EPR D407 através de seus receptores específicos.

Palavras chave:
Receptor da superfamília TGF-β; Células do epitélio pigmentário da retina; Reação em cadeia da polimerase

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Publication Dates

  • Publication in this collection
    Apr 1998
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