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. 2000 Apr;84(4):408–412. doi: 10.1136/bjo.84.4.408

Both CD4+ and CD8+ T cells are involved in protection against HSV-1 induced corneal scarring

H Ghiasi 1, S Cai 1, G Perng 1, A Nesburn 1, S Wechsler 1
PMCID: PMC1723442  PMID: 10729300

Abstract

AIM—To determine the relative impact of CD4+ T cells and CD8+ T cells in protecting mice against ocular HSV-1 challenge.
METHODS—CD4+ T cell knockout mice (CD4−/− mice), CD8+ T cell knockout mice (CD8−/− mice), and mice depleted for CD4+ or CD8+ T cells by antibody (CD4+ depleted and CD8+ depleted mice), were examined for their ability to withstand HSV-1 ocular challenge. The parental mice for both knockout mice were C57BL/6J.
RESULTS—These results suggest that: (1) both CD4+ deficient mice (CD4−/− and CD4+ depleted mice) and CD8+ deficient mice (CD8−/−, and CD8+ depleted mice) developed significantly more corneal scarring than their C57BL/6J parental strain; (2) the duration of virus clearance from the eyes of the CD4+ deficient mice was 4 days longer than that of the CD8+ deficient mice; and (3) the severity of corneal scarring in the CD4+ deficient mice was approximately twice that of the CD8+ deficient mice.
CONCLUSIONS—It was reported here that: (1) CD4+ and CD8+ T cells were both involved in protection against lethal ocular HSV-1 infection; and (2) CD4+ and CD8+ T cells were both involved in protection against HSV-1 induced corneal scarring.



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Figure 1  .

Figure 1  

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Survival of T cell deficient mice. Mice were inoculated ocularly with 2×106 pfu of McKrae as described in Materials and method. Survival was measured 28 days after ocular challenge. (A) Survival of CD8−/− and CD8+ depleted mice compared with C57BL/6J control mice after ocular infection with HSV-1. CD8−/− mice (n=10), CD8+ depleted (n=9), and C57BL/6J (n=9). (B) Survival of CD4−/− and CD4+ depleted mice compared with C57BL/6J control mice after ocular infection with HSV-1. CD4−/− mice (n=14), CD4+ depleted (n=9), and C57BL/6J (n=10).

Figure 2  .

Figure 2  

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Corneal scarring in T cell deficient mice. Corneal scarring was measured 28 days after ocular challenge as described in Materials and method in the mice shown in Figure 1 that survived ocular challenge. (A) Corneal scarring in CD8+ deficient mice; (B) corneal scarring in CD4+ deficient mice. For each bar, the corneal scarring (y axis) represents the average from 16 eyes (CD8−/− mice), 14 eyes (CD8+ depleted mice), 20 eyes (C57BL/6 mice), 16 eyes (CD4−/− mice), 18 eyes (CD4+ depleted mice), and 20 eyes (C57BL/6 mice) (SEM). *Similar to each other and significantly different from other groups (p<0.001, Student's t test).    

Figure 3  .

Figure 3  

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Cytofluorimetric analysis of spleen cells from T cell deficient mice. (A) Spleens from two CD4−/− mice (solid bars) or two C57BL/6 mice depleted for CD4+ T cells with antibody (open bars) were harvested. Single cell suspensions of splenocytes were prepared, reacted with mAbs to CD4+ T cells (L3T4 mAb) and CD8+ T cells (Lyt-2 mAb) and FACS analysis was performed as described in Materials and methods. The level of CD4+CD8− T cells (CD4+) and the level of CD4−CD8+ T cells (CD8+) are shown relative to the level of these cells in untreated control C57BL/6 mice (horizontal line at 100%). Each bar represents the mean from two to four FACS analyses. (B) Spleen cells from two CD8−/− mice (solid bars) or two C57BL/6 mice depleted for CD8+ T cells with antibody (open bars) were prepared and FACS analysis performed as in (A).

Selected References

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