Up-regulation of clusterin during phthalocyanine 4 photodynamic therapy-mediated apoptosis of tumor cells and ablation of mouse skin tumors

K. Kalka, N. Ahmad, T. Criswell, D. Boothman, H. Mukhtar

Research output: Contribution to journalArticle

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Abstract

Photodynamic therapy (PDT) using the silicon phthalocyanine photosensitizer Pc 4 is an oxidative stress associated with the induction of apoptosis in many cancer cells in vitro and in vivo. The mechanisms of PDT-induced tumor cell killing leading to apoptosis are incompletely understood. Clusterin, a widely expressed glycoprotein, is induced in tissues regressing as a consequence of oxidative stress-mediated cell death. Treatment of apoptosis-sensitive human epidermoid carcinoma cells (A431) with PDT resulted in significant up-regulation of clusterin with a maximum at 12 h after treatment, whereas clusterin levels in Pc 4-PDT-treated, apoptosis-resistant, radiation-induced fibrosarcoma (RIF-1) cells remained unchanged. The i.v. administration of Pc 4 to mice bearing chemically or UVB radiation-induced skin papillomas, followed by light application, led to increased clusterin protein expression, peaking 24 h after the treatment, when tumor regression was apparently visible. These data, for the first time, demonstrate the involvement of clusterin in PDT-mediated cell death and during tumor regression. This may have relevance in improving the efficacy of PDT using pharmacological inducers of clusterin.

Original languageEnglish (US)
Pages (from-to)5984-5987
Number of pages4
JournalCancer Research
Volume60
Issue number21
StatePublished - Nov 1 2000

Fingerprint

Clusterin
Photochemotherapy
Up-Regulation
Apoptosis
Skin
Neoplasms
silicon phthalocyanine
Oxidative Stress
Cell Death
Radiation
Photosensitizing Agents
Fibrosarcoma
Papilloma
phthalocyanine
Squamous Cell Carcinoma
Glycoproteins
Therapeutics
Pharmacology
Light

ASJC Scopus subject areas

  • Cancer Research
  • Oncology

Cite this

Up-regulation of clusterin during phthalocyanine 4 photodynamic therapy-mediated apoptosis of tumor cells and ablation of mouse skin tumors. / Kalka, K.; Ahmad, N.; Criswell, T.; Boothman, D.; Mukhtar, H.

In: Cancer Research, Vol. 60, No. 21, 01.11.2000, p. 5984-5987.

Research output: Contribution to journalArticle

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