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Single cell analysis of PKC activation during proliferation and apoptosis induced by laser irradiation
Author(s) -
Gao Xuejuan,
Chen Tongsheng,
Xing Da,
Wang Fang,
Pei Yihui,
Wei Xunbin
Publication year - 2006
Publication title -
journal of cellular physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.529
H-Index - 174
eISSN - 1097-4652
pISSN - 0021-9541
DOI - 10.1002/jcp.20484
Subject(s) - microbiology and biotechnology , förster resonance energy transfer , cell growth , apoptosis , transfection , cell , programmed cell death , chemistry , biology , fluorescence , biochemistry , physics , quantum mechanics , gene
Abstract Laser irradiation has been shown to trigger cellular proliferation and apoptosis in various cell types. Studying the signaling pathways involved in the laser irradiation is important for understanding these processes. In present study, to monitor the protein kinase Cs (PKCs) activity in living cells in real time, we transfected and screened human lung adenocarcinoma cells (ASTC‐a‐1) stably expressing C kinase activity reporter (CKAR) constructed based on fluorescence resonance energy transfer (FRET) technique. The CKAR is a specific, reversible reporter of phosphorylation by PKCs and it can monitor the ongoing balance between PKCs and phosphatases. The increasing dynamics of PKCs activity is monitored during cell proliferation induced by low‐power laser irradiation (LPLI) (0.8 J/cm 2 ) in serum‐starved ASTC‐a‐1 cells stably expressing CKAR reporter using FRET imaging on laser scanning confocal microscope and using spectrofluorometric analysis on a luminescence spectrometer, respectively. However, the decreasing dynamics of PKCs activity has been monitored in real time using FRET imaging for the cells treated with high fluence LPLI (60 J/cm 2 ), which was previously found to induce cell apoptosis. Taken together, LPLI induces the ASTC‐a‐1 cell proliferation by specifically activating PKCs. However, PKCs activity decreases during cell apoptosis induced by high fluence LPLI. Our results indicate that PKCs play an important role in the laser irradiation‐induced biological effects. J. Cell. Physiol. 206: 441–448, 2006. © 2005 Wiley‐Liss, Inc.