The role of CTGF in the diabetic rat retina and its relationship with VEGF and TGF-β 2 , elucidated by treatment with CTGFsiRNA

Hongwei Yang*, Yonggang Huang, Xiaolong Chen, Jie Liu, Yan Lu, Limin Bu, Likun Xia, Wei Xiao, Ming Chen, Qingzhu Nie, Zheli Liu

*Corresponding author for this work

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Purpose: The critical association of connective tissue growth factor (CTGF) with diabetic retinopathy (DR) remains to be clarified. We detected alterations in the gene and protein expression of CTGF and related cytokines, including vascular endothelial growth factor (VEGF) and transforming growth factor-β 2 (TGF-β 2 ), and their response to small interfering RNA (siRNA) targeting the CTGF (CTGFsiRNA) in the retina of diabetic rats. The relationships between CTGF, VEGF and TGF-β 2 levels, as well as the degree of apoptosis in the diabetic retina, were also investigated. Methods: Diabetes was induced in rats by the β-cell toxin streptozotocin (STZ). Retinas were obtained from control and diabetic rats and similar animals treated with CTGFsiRNA by intravitreal injection. mRNA level and protein expression of CTGF, VEGF and TGF-β 2 were measured by reverse transcription-polymerase chain reaction (RT-PCR) and Western blotting, and located by immunohistochemistry. Retinal apoptosis was detected by TUNEL staining. Results: The levels of CTGF, VEGF and TGF-β 2 and the number of TUNEL-positive nuclei were significantly higher in diabetic retinas than in control retinas (p < 0.01). The level of CTGF rose at 8 weeks, earlier than levels of VEGF and TGF-β 2 , which rose at 12 weeks after the onset of diabetes. The difference was significant (p < 0.05). siRNA-mediated inhibition of CTGF mRNA inhibited retinal VEGF and TGF-β 2 and also resulted in a significant decrease in apoptosis. Significant correlations were found between CTGF and VEGF (p = 0.009), CTGF and TGF-β 2 (p = 0.01), and apoptosis and these three cytokines (p < 0.01) in the rat retina early in diabetes. Conclusions: These results suggest that the diabetes-mediated increase in CTGF upregulates VEGF and TGF-β 2 expression and induces apoptosis in the retina. This elevation may be inhibited by treatment with CTGFsiRNA. Connective tissue growth factor may serve as a potential target for the prevention and treatment of DR.

Original languageEnglish (US)
Pages (from-to)652-659
Number of pages8
JournalActa Ophthalmologica
Volume88
Issue number6
DOIs
StatePublished - Sep 1 2010

Fingerprint

Connective Tissue Growth Factor
Vascular Endothelial Growth Factor A
Retina
Transforming Growth Factors
Apoptosis
Therapeutics
In Situ Nick-End Labeling
Diabetic Retinopathy
Small Interfering RNA
Cytokines
Messenger RNA
Intravitreal Injections
Streptozocin
Reverse Transcription
Proteins

Keywords

  • apoptosis
  • connective tissue growth factor (CTGF)
  • diabetic retinopathy
  • rat
  • small interfering RNA

ASJC Scopus subject areas

  • Ophthalmology

Cite this

Yang, Hongwei ; Huang, Yonggang ; Chen, Xiaolong ; Liu, Jie ; Lu, Yan ; Bu, Limin ; Xia, Likun ; Xiao, Wei ; Chen, Ming ; Nie, Qingzhu ; Liu, Zheli. / The role of CTGF in the diabetic rat retina and its relationship with VEGF and TGF-β 2 , elucidated by treatment with CTGFsiRNA In: Acta Ophthalmologica. 2010 ; Vol. 88, No. 6. pp. 652-659.
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abstract = "Purpose: The critical association of connective tissue growth factor (CTGF) with diabetic retinopathy (DR) remains to be clarified. We detected alterations in the gene and protein expression of CTGF and related cytokines, including vascular endothelial growth factor (VEGF) and transforming growth factor-β 2 (TGF-β 2 ), and their response to small interfering RNA (siRNA) targeting the CTGF (CTGFsiRNA) in the retina of diabetic rats. The relationships between CTGF, VEGF and TGF-β 2 levels, as well as the degree of apoptosis in the diabetic retina, were also investigated. Methods: Diabetes was induced in rats by the β-cell toxin streptozotocin (STZ). Retinas were obtained from control and diabetic rats and similar animals treated with CTGFsiRNA by intravitreal injection. mRNA level and protein expression of CTGF, VEGF and TGF-β 2 were measured by reverse transcription-polymerase chain reaction (RT-PCR) and Western blotting, and located by immunohistochemistry. Retinal apoptosis was detected by TUNEL staining. Results: The levels of CTGF, VEGF and TGF-β 2 and the number of TUNEL-positive nuclei were significantly higher in diabetic retinas than in control retinas (p < 0.01). The level of CTGF rose at 8 weeks, earlier than levels of VEGF and TGF-β 2 , which rose at 12 weeks after the onset of diabetes. The difference was significant (p < 0.05). siRNA-mediated inhibition of CTGF mRNA inhibited retinal VEGF and TGF-β 2 and also resulted in a significant decrease in apoptosis. Significant correlations were found between CTGF and VEGF (p = 0.009), CTGF and TGF-β 2 (p = 0.01), and apoptosis and these three cytokines (p < 0.01) in the rat retina early in diabetes. Conclusions: These results suggest that the diabetes-mediated increase in CTGF upregulates VEGF and TGF-β 2 expression and induces apoptosis in the retina. This elevation may be inhibited by treatment with CTGFsiRNA. Connective tissue growth factor may serve as a potential target for the prevention and treatment of DR.",
keywords = "apoptosis, connective tissue growth factor (CTGF), diabetic retinopathy, rat, small interfering RNA",
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The role of CTGF in the diabetic rat retina and its relationship with VEGF and TGF-β 2 , elucidated by treatment with CTGFsiRNA . / Yang, Hongwei; Huang, Yonggang; Chen, Xiaolong; Liu, Jie; Lu, Yan; Bu, Limin; Xia, Likun; Xiao, Wei; Chen, Ming; Nie, Qingzhu; Liu, Zheli.

In: Acta Ophthalmologica, Vol. 88, No. 6, 01.09.2010, p. 652-659.

Research output: Contribution to journalArticle

TY - JOUR

T1 - The role of CTGF in the diabetic rat retina and its relationship with VEGF and TGF-β 2 , elucidated by treatment with CTGFsiRNA

AU - Yang, Hongwei

AU - Huang, Yonggang

AU - Chen, Xiaolong

AU - Liu, Jie

AU - Lu, Yan

AU - Bu, Limin

AU - Xia, Likun

AU - Xiao, Wei

AU - Chen, Ming

AU - Nie, Qingzhu

AU - Liu, Zheli

PY - 2010/9/1

Y1 - 2010/9/1

N2 - Purpose: The critical association of connective tissue growth factor (CTGF) with diabetic retinopathy (DR) remains to be clarified. We detected alterations in the gene and protein expression of CTGF and related cytokines, including vascular endothelial growth factor (VEGF) and transforming growth factor-β 2 (TGF-β 2 ), and their response to small interfering RNA (siRNA) targeting the CTGF (CTGFsiRNA) in the retina of diabetic rats. The relationships between CTGF, VEGF and TGF-β 2 levels, as well as the degree of apoptosis in the diabetic retina, were also investigated. Methods: Diabetes was induced in rats by the β-cell toxin streptozotocin (STZ). Retinas were obtained from control and diabetic rats and similar animals treated with CTGFsiRNA by intravitreal injection. mRNA level and protein expression of CTGF, VEGF and TGF-β 2 were measured by reverse transcription-polymerase chain reaction (RT-PCR) and Western blotting, and located by immunohistochemistry. Retinal apoptosis was detected by TUNEL staining. Results: The levels of CTGF, VEGF and TGF-β 2 and the number of TUNEL-positive nuclei were significantly higher in diabetic retinas than in control retinas (p < 0.01). The level of CTGF rose at 8 weeks, earlier than levels of VEGF and TGF-β 2 , which rose at 12 weeks after the onset of diabetes. The difference was significant (p < 0.05). siRNA-mediated inhibition of CTGF mRNA inhibited retinal VEGF and TGF-β 2 and also resulted in a significant decrease in apoptosis. Significant correlations were found between CTGF and VEGF (p = 0.009), CTGF and TGF-β 2 (p = 0.01), and apoptosis and these three cytokines (p < 0.01) in the rat retina early in diabetes. Conclusions: These results suggest that the diabetes-mediated increase in CTGF upregulates VEGF and TGF-β 2 expression and induces apoptosis in the retina. This elevation may be inhibited by treatment with CTGFsiRNA. Connective tissue growth factor may serve as a potential target for the prevention and treatment of DR.

AB - Purpose: The critical association of connective tissue growth factor (CTGF) with diabetic retinopathy (DR) remains to be clarified. We detected alterations in the gene and protein expression of CTGF and related cytokines, including vascular endothelial growth factor (VEGF) and transforming growth factor-β 2 (TGF-β 2 ), and their response to small interfering RNA (siRNA) targeting the CTGF (CTGFsiRNA) in the retina of diabetic rats. The relationships between CTGF, VEGF and TGF-β 2 levels, as well as the degree of apoptosis in the diabetic retina, were also investigated. Methods: Diabetes was induced in rats by the β-cell toxin streptozotocin (STZ). Retinas were obtained from control and diabetic rats and similar animals treated with CTGFsiRNA by intravitreal injection. mRNA level and protein expression of CTGF, VEGF and TGF-β 2 were measured by reverse transcription-polymerase chain reaction (RT-PCR) and Western blotting, and located by immunohistochemistry. Retinal apoptosis was detected by TUNEL staining. Results: The levels of CTGF, VEGF and TGF-β 2 and the number of TUNEL-positive nuclei were significantly higher in diabetic retinas than in control retinas (p < 0.01). The level of CTGF rose at 8 weeks, earlier than levels of VEGF and TGF-β 2 , which rose at 12 weeks after the onset of diabetes. The difference was significant (p < 0.05). siRNA-mediated inhibition of CTGF mRNA inhibited retinal VEGF and TGF-β 2 and also resulted in a significant decrease in apoptosis. Significant correlations were found between CTGF and VEGF (p = 0.009), CTGF and TGF-β 2 (p = 0.01), and apoptosis and these three cytokines (p < 0.01) in the rat retina early in diabetes. Conclusions: These results suggest that the diabetes-mediated increase in CTGF upregulates VEGF and TGF-β 2 expression and induces apoptosis in the retina. This elevation may be inhibited by treatment with CTGFsiRNA. Connective tissue growth factor may serve as a potential target for the prevention and treatment of DR.

KW - apoptosis

KW - connective tissue growth factor (CTGF)

KW - diabetic retinopathy

KW - rat

KW - small interfering RNA

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