Corneal opacification following keratoplasty in the rat model
Department of Ophthalmology, Ghent University Hospital, De Pintelaan 185, 9000 Gent, Belgium;
Keywords: corneal opacification; keratoplasty; rat model
I read with great interest the excellent perspective by Plsková et al,1 in which they raise the issue of transient corneal opacification following corneal transplantation in the mouse model and argue that it might be due to a sufficient number of endothelial cells regaining function.
What the authors describe for the mouse model also occurs in the rat model. In fact, most researchers on the rat model probably have this experience, but for some reason do not think it is very important and/or choose to ignore it. Apart from the article by Williams et al,2 there is—as far as I know—only one other author who has explicitly mentioned this transient opacification. In their paper, Herbort et al3 wrote "The grafts began clearing 4 weeks after surgery . . . and vessels in the graft diminished from 6 weeks post-surgery." and "It has to be noted that after acute rejection most corneas regain some clarity by 7–8 weeks." Transient corneal opacification also occurs in the rat model I used4 (AO rats (strain RT1u) served as recipients of corneas from PVG rats (strain RT1c) and corneas were sutured with a single running suture). Allogeneic transplanted corneas showed no initial opacification immediately postoperatively; neither did the syngeneic controls. All allogeneic corneas "rejected" (or more precisely showed total opacification) around day 11–13 and those corneas, when followed long enough, all cleared. Opacification remained higher than 2 (meaning an increased corneal haze, but some anterior chamber structures still visible) at days 17–21 and became lower than 2 (slight haze) around days 21–32.
It would be exciting to know if the hypothesis put forward by Plsková et al1 would also apply to the rat model and to find out if this "clearing" of the opacification also occurs in other rat strains than the ones mentioned.
Plsková et al have raised a very important topic where a lot of uncertainty still exists, and which warrants further research.
References
Plsková J, Kuffová L, Holán V, et al. Evaluation of corneal graft rejection in a mouse model. Br J Ophthalmol 2002;86:108–13.
Williams KA, Coster DJ. Penetrating corneal transplantation in the inbred rat; a new model. Invest Ophthalmol Vis Sci 1985;26:23–30.
Herbort CP, Matsubara M, Nishi M, et al. Penetrating keratoplasty in the rat: a model for the study of immunosuppressive treatment of graft rejection. Jpn J Ophthalmol 1989;33:212–20.
Claerhout I, Beele H, Verstraete A, et al. The effect of duration and timing of systemic cyclosporine therapy on corneal allograft survival in the rat model. Graefes Arch Clin Exp Ophthalmol 2001;239:152–7.(Ilse Claerhout)
淇℃伅浠呬緵鍙傝€冿紝涓嶆瀯鎴愪换浣曚箣寤鸿銆佹帹鑽愭垨鎸囧紩銆傛枃绔犵増鏉冨睘浜庡師钁椾綔鏉冧汉锛岃嫢鎮ㄨ涓烘鏂囦笉瀹滆鏀跺綍渚涘ぇ瀹跺厤璐归槄璇伙紝璇烽偖浠舵垨鐢佃瘽閫氱煡鎴戜滑锛屾垜浠敹鍒伴€氱煡鍚庯紝浼氱珛鍗冲皢鎮ㄧ殑浣滃搧浠庢湰缃戠珯鍒犻櫎銆�Keywords: corneal opacification; keratoplasty; rat model
I read with great interest the excellent perspective by Plsková et al,1 in which they raise the issue of transient corneal opacification following corneal transplantation in the mouse model and argue that it might be due to a sufficient number of endothelial cells regaining function.
What the authors describe for the mouse model also occurs in the rat model. In fact, most researchers on the rat model probably have this experience, but for some reason do not think it is very important and/or choose to ignore it. Apart from the article by Williams et al,2 there is—as far as I know—only one other author who has explicitly mentioned this transient opacification. In their paper, Herbort et al3 wrote "The grafts began clearing 4 weeks after surgery . . . and vessels in the graft diminished from 6 weeks post-surgery." and "It has to be noted that after acute rejection most corneas regain some clarity by 7–8 weeks." Transient corneal opacification also occurs in the rat model I used4 (AO rats (strain RT1u) served as recipients of corneas from PVG rats (strain RT1c) and corneas were sutured with a single running suture). Allogeneic transplanted corneas showed no initial opacification immediately postoperatively; neither did the syngeneic controls. All allogeneic corneas "rejected" (or more precisely showed total opacification) around day 11–13 and those corneas, when followed long enough, all cleared. Opacification remained higher than 2 (meaning an increased corneal haze, but some anterior chamber structures still visible) at days 17–21 and became lower than 2 (slight haze) around days 21–32.
It would be exciting to know if the hypothesis put forward by Plsková et al1 would also apply to the rat model and to find out if this "clearing" of the opacification also occurs in other rat strains than the ones mentioned.
Plsková et al have raised a very important topic where a lot of uncertainty still exists, and which warrants further research.
References
Plsková J, Kuffová L, Holán V, et al. Evaluation of corneal graft rejection in a mouse model. Br J Ophthalmol 2002;86:108–13.
Williams KA, Coster DJ. Penetrating corneal transplantation in the inbred rat; a new model. Invest Ophthalmol Vis Sci 1985;26:23–30.
Herbort CP, Matsubara M, Nishi M, et al. Penetrating keratoplasty in the rat: a model for the study of immunosuppressive treatment of graft rejection. Jpn J Ophthalmol 1989;33:212–20.
Claerhout I, Beele H, Verstraete A, et al. The effect of duration and timing of systemic cyclosporine therapy on corneal allograft survival in the rat model. Graefes Arch Clin Exp Ophthalmol 2001;239:152–7.(Ilse Claerhout)
|
寰俊鏂囩珷
鍏虫敞鐧炬媷
璇勮鍑犲彞
鎼滅储鏇村
鎺ㄥ瓨缁欐湅鍙�
鍔犲叆鏀惰棌
|