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Experimental Therapeutics

In Vitro and in Vivo Effect of Doxorubicin Combined with Liposome-encapsulated Muramyl Tripeptide on Canine Monocyte Activation

Fushun Shi, E. Gregory MacEwen and Ilene D. Kurzman
Fushun Shi
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E. Gregory MacEwen
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Ilene D. Kurzman
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DOI:  Published September 1993
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Abstract

Chemotherapeutic agents have been shown to enhance the antitumor activity of biological response modifiers and cytokines in rodents and humans. The purpose of this study was 2-fold: (a) to determine whether doxorubicin (DOX) would enhance or interfere with the effect of muramyl dipeptide and lipopolysaccharide on canine monocyte activation as measured by an in vitro WEHI-164 cell cytotoxicity assay; and (b) to evaluate the in vivo effect of DOX alone and combined with liposome-encapsulated muramyl tripeptide-phosphatidylethanolamine (L-MTP-PE) on monocyte activation and serum tumor necrosis factor activity. The in vitro results showed that increasing concentrations of DOX for either 1 or 24 h incubation did not directly enhance or inhibit spontaneous or activated monocyte supernatant-mediated cytotoxicity. The in vivo study showed that monocyte supernatant-mediated cytotoxicity was increased on day 3 and significantly elevated on day 7 (P = 0.016) post-DOX (30 mg/m2, single injection) administration. When DOX was given in combination with L-MTP-PE (2 mg/m2, twice weekly for 3 weeks), monocyte-mediated cytotoxicity was enhanced on days 3 through 10 with a significant increase on day 10 (P < 0.001). In vivo monocyte supernatant-mediated cytotoxicity was significantly elevated in dogs receiving L-MTP-PE alone at 2 h after day 0, 7, and 14 treatment, and this response was further enhanced by DOX. Serum tumor necrosis factor activity at 2 h post-L-MTP-PE was enhanced and sustained for a longer period of time in dogs that also received DOX. We conclude that DOX administered with L-MTP-PE will enhance canine monocyte activation induced by DOX or L-MTP-PE alone, and suggest that DOX may be combined with L-MTP-PE early in the treatment of cancer patients.

Footnotes

  • ↵1 Supported by American Cancer Society Grant CH-473, the American Veterinary Medical Association Foundation, Bristol-Meyer Squibb, and CIBA-GEIGY Ltd.

  • ↵2 To whom requests for reprints should be addressed, at School of Veterinary Medicine, University of Wisconsin-Madison, 2015 Linden Drive West, Madison, WI 53706.

  • Received March 4, 1993.
  • Accepted June 21, 1993.
  • ©1993 American Association for Cancer Research.
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September 1993
Volume 53, Issue 17
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In Vitro and in Vivo Effect of Doxorubicin Combined with Liposome-encapsulated Muramyl Tripeptide on Canine Monocyte Activation
Fushun Shi, E. Gregory MacEwen and Ilene D. Kurzman
Cancer Res September 1 1993 (53) (17) 3986-3991;

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In Vitro and in Vivo Effect of Doxorubicin Combined with Liposome-encapsulated Muramyl Tripeptide on Canine Monocyte Activation
Fushun Shi, E. Gregory MacEwen and Ilene D. Kurzman
Cancer Res September 1 1993 (53) (17) 3986-3991;
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