[The effect of copolymer-1 on the apoptosis and the IL-6R expression of the retinal ganglion cells in chronic elevated intraocular pressure rat model].

Aim: To observe the effect of autoimmune response induced by copolymer-1 (COP-1) on apoptosis of retinal ganglion cells (RGCs) and IL-6R expression on the RGCs in chronic elevated intraocular pressure (EIOP) rat models.

Methods: Thirty SD rats were randomly divided into 3 groups, namely normal control group, mock-immunized EIOP group and COP-1-immunized EIOP group. Cauterization of episcleral vein was used to set up rat's EIOP model. The normal control rats were not immunized, whereas the rats in the other two groups were immunized via i.p injection with normal saline and COP-1 at hindfeet, respectively. The expression of the IL-6R on RGCs was detected by immunohistochemical staining. The apoptosis of the RGCs was examined by TUNEL staining.

Results: The number of the apoptotic RGCs in the COP-1- immunized EIOP group was notably lower than that in mock-immunized EIOP group (P<0.05). IL-6R were expressed on RGCs in all 3 groups, and expression level of IL-6R increased in the following order: normal control group, mock-immunized EIOP group and COP-1-immunized EIOP group (P<0.05).

Conclusion: The autoimmune response induced by COP-1 protects the RGCs from apoptosis under the condition of chronic EIOP and results in increased IL-6R expression on RGCs. These results suggest that increased IL-6R expression on RGCs induced by COP-1 immunization with the protection of neurons resulted from autoimmune response is related.