Cureus

Aging of Vision Nerve Cells Connects Diabetes to Retinal Nerve Damage

Updated

Abstract

Diabetic mice exhibited significant hyperglycemia and impaired retinal function with marked reductions in neural response amplitudes.

  • Streptozotocin-induced diabetic mice showed reduced a-wave, b-wave, and oscillatory potential amplitudes in electroretinography, indicating impaired retinal neural function.
  • Molecular analyses revealed significant upregulation of MCP-1 and p16 at both mRNA and protein levels in retinal tissue.
  • Immunostaining indicated co-expression of p16 in a subset of retinal ganglion cells, suggesting the presence of senescence in these neurons.
  • In vitro studies showed that exposing retinal ganglion cells to oxidative stress or treating them with a CDK4/6 inhibitor led to progressive neurite shortening.
  • These findings suggest that both oxidative stress and cellular senescence may contribute to retinal ganglion cell injury in diabetes.

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Funding

Competing interests

Human subjects: All authors have confirmed that this study did not involve human participants or tissue. Animal subjects: The Nagoya University Animal Care Committee Issued protocol number M230317-002, M240278-003, M250182-004. Conflicts of interest: In compliance with the ICMJE uniform disclosure form, all authors declare the following: Payment/services info: This work was partially supported by Grants-in-Aid for Scientific Research C (H.K.; 22K09810) and for young scientists (A.S.; 22K16949, and H.S.; 22K16968) from the Ministry of Education, Culture, Sports, Science and Technology (KAKENHI) (http://www.jsps.go.jp/); Takeda Science Foundation (H.K.); Bayer Retina Award Foundation (H.K.), Oyama Health Foundation (H.K.), and the Naito Foundation (A.S.). Financial relationships: Koji M Nishiguchi declare(s) a grant from JCR Pharmaceuticals, Santen, Novartis, Japan Alcon, AMO, Takara Bio, Takeda Pharmaceutical, Bayer, Rohto Nitten, Wakamoto, Senjyu, HOYA, Topcon, Kowa, Ritz medical, ABBVIE, TOMEY, Eisai, Mayo Corporation, Icon Inc., JAMCON, Japan Focus Co., Kyowaika Co., Handaya Co., Nippon Chem., Chugai. Hiroki Kaneko declare(s) a grant from Senju, AMO. Hiroki Kaneko declare(s) personal fees and support for attending meetings/travel, receipt of equipment/materials/drugs/medical writing/gifts from Santen, Bayer, Novartis, Senju, AMO, HOYA, Japan Alcon, Kirin Holdings Company, Mochida, Chugai. Koji M Nishiguchi declare(s) personal fees and support for attending meetings/travel, receipt of equipment/materials/drugs/medical writing/gifts from Chugai, Alcon, Bayer, Novartis, Santen, Kowa, Senjyu, Otsuka, Wakamoto. Ayana Suzumura declare(s) personal fees from Bayer, Santen, Novartis, Chugai, Senju. Hideyuki Shimizu declare(s) personal fees from Amgen. Other relationships: All authors have declared that there are no other relationships or activities that could appear to have influenced the submitted work.
PubMed

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