PMID: 11920653Mar 29, 2002Paper

Comparison of aluminium (III) phthalocyanine tetrasulfonate- and meta-tetrahydroxyphenylchlorin-monoclonal antibody conjugates for their efficacy in photodynamic therapy in vitro

International Journal of Cancer. Journal International Du Cancer
M B VrouenraetsG A van Dongen

Abstract

A challenge in photodynamic therapy (PDT) is to improve the tumour selectivity of the photosensitizers by using monoclonal antibodies (MAbs). With this aim, we developed MAb-conjugates with the hydrophobic photosensitizer meta-tetrahydroxyphenylchlorin (mTHPC) and with the hydrophilic sensitizer aluminium (III) phthalocyanine tetrasulfonate (AlPcS(4)). The capacity of these photoimmunoconjugates for selective targeting of squamous cell carcinoma (SCC) in vivo was demonstrated previously in SCC-bearing nude mice. Preliminary in vitro PDT studies with the vulvar SCC cell line A431 showed promising phototoxicity with both sensitizers when coupled to the internalizing MAb 425. To rank the photosensitizers for their potential in photoimmunotherapy, we herein describe an extensive in vitro evaluation of mTHPC-MAb and AlPcS(4)-MAb conjugates. Both classes of conjugates were directly compared using 5 different SCC cell lines as target and 3 different MAbs (BIWA 4, E48 and 425) for tumour cell targeting. In contrast to free AlPcS(4) (IC(50) > or = 700 nM), MAb-conjugated AlPcS(4) was found to be highly phototoxic in PDT in all 5 cell lines. AlPcS(4)-BIWA 4 was most consistently effective with IC(50) values ranging from 0.06-5.4 nM. mTHP...Continue Reading

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Citations

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