首页> 外文会议>Conference on Laser Tissue Interaction XIII: Photochemical, Photothermal, and Photomechanical, Jan 20-23, 2002, San Jose, California >Morphometric Comparison of the Acute Rabbit Corneal Response to 1540 nm Laser Light Following In Vitro Exposure to Millisecond or Nanosecond Pulse Widths
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Morphometric Comparison of the Acute Rabbit Corneal Response to 1540 nm Laser Light Following In Vitro Exposure to Millisecond or Nanosecond Pulse Widths

机译:体外暴露于毫秒或纳秒脉冲宽度后急性兔角膜对1540 nm激光响应的形态计量学比较

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Significant damage to rabbit corneal tissue was produced by a single pulse, in vitro exposure of 1540 nm infrared laser light operating in either millisecond or nanosecond pulse widths. Millisecond pulse widths of infrared laser light produced a marked coagulative necrosis of both the corneal epithelium and stroma. We also noted histologic alterations in the stromal matrix within the beam path that we inter preted as matrix remodeling. To test this interpretation, we used an indirect immunohistochemical procedure to detect Matrix Metalloproteinase-2 (MMP-2) activity. Immunohistochemistry revealed that the MMP-2 reaction was mostly limited to the margins of the beam path, In addition, the MMP-2 reaction was less intense than expected given the significant tissue changes observed in the histologic sections. Exposure of rabbit corneal tissue to the nanosecond pulse widths produced a less severe coagulative necrosis of the tissue when compared to the millisecond exposures. However, a markedly stronger immunohistochemical pattern than would have been predicted from the histologic sections was observed, with approximately half of the beam path filled with MMP-2 reaction product. These data suggest an association between infrared laser pulse width and the degree of extracellular matrix remodeling in rabbit corneal tissue.
机译:单脉冲体外暴露于以毫秒或纳秒脉冲宽度工作的1540 nm红外激光,会对兔子角膜组织造成重大损害。红外激光的毫秒脉冲宽度会导致角膜上皮和基质的明显凝固性坏死。我们还注意到,我们将光束路径解释为基质重构中基质矩阵的组织学变化。为了测试这种解释,我们使用了间接免疫组织化学方法来检测基质金属蛋白酶2(MMP-2)的活性。免疫组织化学显示,MMP-2反应主要限于光路的边缘。此外,鉴于组织学切片中观察到明显的组织变化,MMP-2反应的强度不如预期。与毫秒暴露相比,兔角膜组织暴露于纳秒脉冲宽度所产生的组织凝结坏死的程度较小。然而,观察到的免疫组织化学模式比组织学切片所预测的强得多,大约一半的光路中充满了MMP-2反应产物。这些数据表明在兔角膜组织中红外激光脉冲宽度与细胞外基质重塑程度之间存在关联。

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