Purified photoproducts of merocyanine 540 trigger cytochrome C release and caspase 8-dependent apoptosis in human leukemia and melanoma cells

Shazib Pervaiz, Mohamed A. Seyed, Jayshreekumari L. Hirpara, Marie Véronique Clément, Kok W. Loh

Research output: Contribution to journalArticle

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Abstract

If the interplay between caspase proteases and mitochondria decide the fate of the cell during apoptosis, they may constitute useful molecular targets for novel drug design. We have shown that photoactivated merocyanine 540 (pMC540) triggers caspase-mediated apoptosis in HL60 leukemia and M14 melanoma cells. Because pMC540 is a mixture of photoproducts, we set out to purify the biologically active component(s) from this mixture and to investigate their ability to directly activate intracellular caspases and/or trigger mitochondrial events associated with apoptosis. Two photoproducts, namely C1 and C2, purified and characterized by mass spectroscopy and nuclear magnetic resonance (NMR) analysis, effectively induced apoptosis in HL60 and M14 cells. Interestingly, both C1 and C2 induced non-receptor-dependent activation of caspase 8, which was responsible for the downstream activation of caspase 3 and cell death. Both compounds induced the release of cytochrome C from mitochondria of tumor cells and from purified rat liver mitochondria; however, different mechanisms were operative in cytochrome C translocation in response to C1 or C2. C1-induced cytochrome C release was mediated by the mitochondrial permeability transition (MPT) pore and accompanied by a decrease in mitochondrial transmembrane potential (Δψ(m)), whereas cytochrome C release in response to C2 was independent of MPT pore opening. These findings do not exclude the possibility that changes in mitochondrial Δψ(m)) are critical for apoptosis in some instances, but support the notion that this may not be a universal step in the apoptotic process. Thus, identification of two novel anticancer agents that directly activate effector components of the apoptotic pathway could have potential implications for the development of newer chemotherapeutic drugs.

Original languageEnglish
Pages (from-to)4096-4108
Number of pages13
JournalBlood
Volume93
Issue number12
Publication statusPublished - 15 Jun 1999
Externally publishedYes

Fingerprint

Caspase 8
Cytochromes
Melanoma
Leukemia
Mitochondria
Apoptosis
Caspases
Chemical activation
Cytochromes c1
Liver Mitochondrion
HL-60 Cells
Drug Design
Cell death
Caspase 3
Pharmaceutical Preparations
Liver
Antineoplastic Agents
Membrane Potentials
Rats
Tumors

ASJC Scopus subject areas

  • Hematology

Cite this

Pervaiz, S., Seyed, M. A., Hirpara, J. L., Clément, M. V., & Loh, K. W. (1999). Purified photoproducts of merocyanine 540 trigger cytochrome C release and caspase 8-dependent apoptosis in human leukemia and melanoma cells. Blood, 93(12), 4096-4108.

Purified photoproducts of merocyanine 540 trigger cytochrome C release and caspase 8-dependent apoptosis in human leukemia and melanoma cells. / Pervaiz, Shazib; Seyed, Mohamed A.; Hirpara, Jayshreekumari L.; Clément, Marie Véronique; Loh, Kok W.

In: Blood, Vol. 93, No. 12, 15.06.1999, p. 4096-4108.

Research output: Contribution to journalArticle

Pervaiz, S, Seyed, MA, Hirpara, JL, Clément, MV & Loh, KW 1999, 'Purified photoproducts of merocyanine 540 trigger cytochrome C release and caspase 8-dependent apoptosis in human leukemia and melanoma cells', Blood, vol. 93, no. 12, pp. 4096-4108.
Pervaiz, Shazib ; Seyed, Mohamed A. ; Hirpara, Jayshreekumari L. ; Clément, Marie Véronique ; Loh, Kok W. / Purified photoproducts of merocyanine 540 trigger cytochrome C release and caspase 8-dependent apoptosis in human leukemia and melanoma cells. In: Blood. 1999 ; Vol. 93, No. 12. pp. 4096-4108.
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