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[The corneal allograft rejection features in CD4 and CD8 knock-out mice]
1Qingdao Eye Hospital,Shandong Eye Institute, Qingdao 266071, China.
Objective:
To study the mechanism and the features of corneal allograft rejection using a model of CD4 and CD8 knock-out mice.
Methods:
The mice were divided into three groups with 20 mice in each group. CD4 knock-out mice, CD8 knock-out mice and C57BL/6 mice were used as recipients and BALB/c mice as corneal graft donors. Postoperative evaluation included slit-lamp biomicroscopy and immunohistological studies. The rejection times were recorded and the cytokines in the eye after the surgery were measured at 1 week, 2 weeks and 4 weeks after the transplantation. Thirty mice (each group ten mice) received skin transplantation using BALB/c as donors in the second week after penetrating keratoplasty. The time of skin grafts rejection was recorded and the cornea grafts were inspected when the skin grafts were rejected.
Results:
The rejection time varied in these three groups. The corneal grafts in CD4 knock-out mice were clear and no rejection occurred > 90 days. The corneal grafts in CD8 knock out mice were rejected at (28 +/- 3) days. The grafts in the control groups were rejected at (14 +/- 2) days (F = 2034, P < 0.01). The skin grafts rejection were recorded at (14 +/- 2), (12 +/- 1), (10 +/- 1) days in CD4 knock-out mice, CD8 knock-out mice and control groups, respectively (F = 42.54, P < 0.01).
Conclusions:
CD4 and CD8 knock-out mice are useful models for studying of corneal graft rejection. The cornea allograft rejection after penetrating keratoplasty is mediated primarily by CD(4)(+) T lymphocytes. The CD(8)(+) T lymphocytes also participate in the rejection processes.
Insights
Corneal allograft rejection is primarily mediated by CD4+ T lymphocytes, with CD8+ T cells also playing a role. CD4 knock-out mice demonstrated significantly reduced rejection, highlighting their utility in studying corneal transplants.
Area of Science:
- Immunology
- Transplantation Biology
- Ophthalmology
Background:
- Corneal allograft rejection remains a significant challenge in transplantation.
- Understanding the specific immune mechanisms involved is crucial for improving graft survival.
- CD4+ and CD8+ T lymphocytes are known key players in immune responses.
Purpose of the Study:
- To elucidate the roles of CD4+ and CD8+ T lymphocytes in corneal allograft rejection.
- To utilize CD4 and CD8 knock-out mouse models to study rejection mechanisms.
- To characterize the features and timelines of corneal graft rejection in different immune-deficient models.
Main Methods:
- Corneal transplantation performed using CD4 knock-out, CD8 knock-out, and wild-type (C57BL/6) mice as recipients.
- BALB/c mice served as corneal graft donors.
- Graft rejection monitored via slit-lamp biomicroscopy and immunohistological studies; cytokine levels measured.
Main Results:
- Corneal grafts in CD4 knock-out mice showed no rejection >90 days, indicating a primary role for CD4+ T cells.
- CD8 knock-out mice experienced rejection at approximately 28 days, while control groups rejected grafts around 14 days.
- Skin graft rejection times also varied, supporting the differential roles of T cell subsets in immune responses.
Conclusions:
- Corneal allograft rejection following penetrating keratoplasty is predominantly mediated by CD4+ T lymphocytes.
- CD8+ T lymphocytes contribute to the rejection process, though to a lesser extent than CD4+ cells.
- CD4 and CD8 knock-out mouse models are valuable tools for investigating corneal graft rejection mechanisms.
