期刊
JOURNAL OF BIOPHOTONICS
卷 1, 期 1, 页码 24-35出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/jbio.200710010
关键词
cell viability; membrane permeabilization; molecular delivery; plasma formation; shock wave; cavitation bubble; sonoporation; ultrasonic
资金
- National Institutes of Health
- Laser Microbeam and Medical [P41-RR01192, R01-EB04436]
- University of California Systemwide Biotechnology Research and Education Program GREAT Training [2006-1.2]
Cell lysis and molecular delivery in confluent monolayers of PtK2 cells are achieved by the delivery of 6 ns, lambda = 532 nm laser pulses via a 40 x, 0.8 NA microscope objective. With increasing distance from the point of laser focus we find regions of (a) immediate cell lysis; (b) necrotic cells that detach during the fluorescence assays; (c) permeabilized cells sufficient to facilitate the uptake of small (3 kDa) FITC-conjugated Dextran molecules in viable cells; and (d) unaffected, viable cells. The spatial extent of cell lysis, cell detachment, and molecular delivery increased with laser pulse energy. Hydrodynamic analysis from time-resolved imaging studies reveal that the maximum wall shear stress associated with the pulsed laser microbeam-induced cavitation bubble expansion governs the location and spatial extent of each of these regions independent of laser pulse energy. Specifically, cells exposed to maximum wall shear stresses tau(w,max) > 190 +/- 20 kPa are immediately lysed while cells exposed to tau(w,max) > 18 +/- 2 kPa are necrotic and subsequently detach. Cells exposed to tau(w,max) in the range 8-18 kPa are viable and successfully optoporated with 3 kDa Dextran molecules. Cells exposed to tau(w,max) < 8 +/- 1 kPa remain viable without molecular delivery. These findings provide the first direct correlation between pulsed laser microbeam-induced shear stresses and subsequent cellular outcome. (C) 2008 by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据