{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,28]],"date-time":"2025-10-28T03:09:37Z","timestamp":1761620977596},"reference-count":71,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2008,1,2]],"date-time":"2008-01-02T00:00:00Z","timestamp":1199232000000},"content-version":"vor","delay-in-days":5024,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Photochem &amp; Photobiology"],"published-print":{"date-parts":[[1994,4]]},"abstract":"<jats:p><jats:bold>Abstract<\/jats:bold> The mode of cell death following photodynamic therapy was investigated from the perspective of programmed cell death or apoptosis. Human prostate carcinoma cells (PC3), human non\u2010small cell lung carcinoma (H322a) and rat mammary carcinoma (MTF7) were treated by photodynamic therapy. An examination of extracted cellular DNA by gel electrophoresis showed the characteristic DNA ladder indicative of internucleosomal cleavage of DNA during apoptosis. The magnitude of the response and the photodynamic therapy dosage required to induce DNA fragmentation were different in PC3 and MTF7. The MTF7 cells responded with rapid apoptosis at the dose of light and drug that yielded 50% cell death (LD<jats:sub>50<\/jats:sub>). In contrast, PC3 showed only marginal response at the LD<jats:sub>50<\/jats:sub> but had a marked response at the LD<jats:sub>85<\/jats:sub>. Thus, apoptosis did not ensue as quickly in PC3 as in MTF7. The H322a cells were killed by photodynamic therapy but failed to exhibit any apoptotic response. The results also suggested that apoptosis in these cell lines has a minor requirement for <jats:italic>de novo<\/jats:italic> protein synthesis and no requirement for <jats:italic>de novo<\/jats:italic> RNA synthesis. This study indicates that although apoptosis can occur during photodynamic therapy\u2010induced cell death, this response is not universal for all cancer cell lines.<\/jats:p>","DOI":"10.1111\/j.1751-1097.1994.tb05066.x","type":"journal-article","created":{"date-parts":[[2008,1,2]],"date-time":"2008-01-02T19:52:29Z","timestamp":1199303549000},"page":"468-473","source":"Crossref","is-referenced-by-count":136,"title":["PHOTODYNAMIC THERAPY WITH PHOTOFRIN II INDUCES PROGRAMMED CELL DEATH IN CARCINOMA CELL LINES"],"prefix":"10.1111","volume":"59","author":[{"given":"Xiao\u2010Yan","family":"He","sequence":"first","affiliation":[]},{"given":"Robert A.","family":"Sikes","sequence":"additional","affiliation":[]},{"given":"Sharon","family":"Thomsen","sequence":"additional","affiliation":[]},{"given":"Leland W. 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