Volume 58, Issue 1 pp. 95-101
Experimental Cancer
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Pre-Treatment of human osteosarcoma cells with N-methylformamide enhances P-glycoprotein expression and resistance to doxorubicin

Katia Scotlandi

Corresponding Author

Katia Scotlandi

Laboratorio di Ricerca Oncologica, Istituti Ortopediti Rizzoli, Bologna

Laboratorio di Ricerca Oncologies, Istituti Ortopedici Rizzoli, Via Di Barbiano 1/10, 40136 Bologna, Italy. Fax: 39 51 584422Search for more papers by this author
Massimo Serra

Massimo Serra

Laboratorio di Ricerca Oncologica, Istituti Ortopediti Rizzoli, Bologna

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Maria Cristina Manara

Maria Cristina Manara

Laboratorio di Ricerca Oncologica, Istituti Ortopediti Rizzoli, Bologna

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Pier-Luigi Lollini

Pier-Luigi Lollini

Istituto di Cancerologia, Universitá di Bologna, Bologna, Rome, Italy

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Daniela Maurici

Daniela Maurici

Laboratorio di Ricerca Oncologica, Istituti Ortopediti Rizzoli, Bologna

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Donatella Del Bufalo

Donatella Del Bufalo

Laboratorio di Chemiolerapia Sperimentale, Istituto Regina Elena, Rome, Italy

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Nicola Baldini

Nicola Baldini

Laboratorio di Ricerca Oncologica, Istituti Ortopediti Rizzoli, Bologna

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First published: 1 July 1994
Citations: 15

Abstract

N-methylformamide (NMF), 3 powerful differentiating agent, has been extensively used in experimental and preclinical cancer chemotherapy studies, alone or in association with conventional anti-cancer drugs. To evaluate the use of this molecule in the treatment of osteosarcoms (OS), we have analyzed the effects of NMF and doxorubicin (DXR) or DXR-sensitive and -resistant human OS cell lines. Our study shows that NMF exerts remarkable effects on cell proliferation and, in Saos-2 and SARG cells, also induces differentiation, as shown by increasing alkaline phosphatase activity. Moreover, NMF increases the cytotoxic activity of DXR when administered after the drug, In both DXR-sensitive and -resistant cells. However, when this agent is given before DXR, it enhances P-glycoprotein expression in U-2 OS cell lines. This over-expression is associated with reduced DXR accumulation within cells and with significant enhancement of resistance to DXR. © 1994 Wiley-Liss, Inc.

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