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[Expression pattern of nitric oxide synthase in the retina of diabetic rats]. | LitMetric

[Expression pattern of nitric oxide synthase in the retina of diabetic rats].

Nan Fang Yi Ke Da Xue Xue Bao

Department of Anatomy, School of Preclinical and Forensic Medicine, Sichuan University, Chengdu 610041, China.

Published: April 2007

AI Article Synopsis

  • The study aimed to investigate the expression of nitric oxide synthase (NOS) in the retinas of 8-week-old diabetic rats to understand the role of nitric oxide in diabetic retinopathy (DR).
  • Using advanced genetic analysis methods, researchers identified changes in the levels of three NOS subtypes (eNOS, nNOS, and iNOS) in the diabetic rat retinas compared to normal ones.
  • The findings showed a decrease in eNOS and nNOS levels along with an increase in iNOS, suggesting that these alterations are linked to the development and worsening of diabetic retinopathy.

Article Abstract

Objective: To investigate the expression of nitric oxide synthase (NOS) in the retina of 8-week-old diabetic rats, and explore the potential molecular mechanisms for the role of NO in diabetic retinopathy (DR).

Methods: Retinal gene expression profile of normal and 8-week-old diabetic rats was constructed with restriction fragment differential display polymerase chain reaction (RFDD-PCR). Bioinformatic analysis of the differentially expressed gene identified the genes coding for 3 subtypes of NOS, namely eNOS, nNOS and iNOS as the candidate genes related to DR, which was verified using semi-quantitative RT-PCR and immunohistochemistry.

Results: The results of RFDD-PCR revealed down-regulated expression of eNOS and nNOS and up-regulated iNOS expression in diabetic rat retina. RT-PCR showed that the expression levels of eNOS and nNOS in diabetic rat retina were obviously lower than that in normal retina (0.23-/+0.03 vs 0.32-/+0.03 for eNOS, P<0.05; 0.25-/+0.02 vs 0.36-/+0.02 for nNOS, P<0.05), but the expression level of iNOS obviously higher (0.27-/+0.02 vs 0.20-/+0.03, P<0.05). Immunohistochemistry of healthy retina visualized eNOS-, nNOS- and iNOS-positive cells, all located in the inner nuclear layer (INL) and ganglion cell layer (GCL), and eNOS-positive cells were also found in vascular endothelium. In diabetic retina, the number of eNOS- and nNOS-positive cells was significantly lowered in comparison with normal rat retina (14.33-/+3.19 vs 22.13-/+3.60 for eNOS, P<0.05; 21.87-/+3.62 vs 34.40-/+7.09 for nNOS, P<0.05), but the number of iNOS-positive cells significantly increased (17.60-/+2.58 vs 11.73-/+2.70, P<0.05).

Conclusion: The alterations in eNOS, nNOS and iNOS expression are associated with the deuelopmant and progression of DR.

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