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Triphenyltin acetate toxicity : a biochemical and ultrastructural study on mouse thymocytes

Dipartimento di Patologica Animale, Settore di Anatomia Patologica

L. Ceppa

Settore di Farmacologia e Tossicologia, Università di Torino, Italia

E. Cornaglia

Dipartimento di Patologica Animale, Settore di Anatomia Patologica

C. Nebbia

Settore di Farmacologia e Tossicologia, Università di Torino, Italia

B. Biolatti

Dipartimento di Patologica Animale, Settore di Anatomia Patologica

M. Dacasto

Settore di Farmacologia e Tossicologia, Università di Torino, Italia

1 Triphenyltin acetate (TPTA) has been shown to exert in vivo a selective toxic effect on the immune system. To assess in vitro possible alterations induced by TPTA exposure, primary cultures of mouse thymocytes were incubated up to 24 h with graded amounts (1-12 µM) ofthe organotin.

2 The cytotoxic activity has been evaluated with the MTT colorimetric assay, the neutral red (NR) assay and the lactic dehydrogenase (LDH) cellular release. Cell pellets were fixed with 2.5% glutaraldehyde, resin-embedded and ultrathin sections were observed through transmission electron microscopy.

3 After 2 h of incubation, dose-dependent increases of cytotoxicity were observed in thymocytes submitted to MTT and NR tests (up to 41.43% and 18.9%, respectively), while 22 h later this overt effect on cell viability was noticed merely in cells exposed to 12 µM TPTA. Dose- dependent increases of LDH leakage in the culture medium were observed all throughout the study.

4 Morphological investigations revealed features (chro matin condensation, cell membranes fragmentation and formation of membrane bound apoptotic bodies) sugges tive of apoptosis.

5 This study indicates that TPTA is cytotoxic to mouse thymocytes: morphologically, the rising of apoptosis is likely to be recognized, as previously reported in different in vitro studies with other immunosuppressive agents as dioxin and corticosteroids.

Key Words: mouse • lymphocyte • triphenyltin acetate • apoptosis

Human & Experimental Toxicology, Vol. 15, No. 3, 219-225 (1996)
DOI: 10.1177/096032719601500306


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