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Effects of a monoclonal anti-αvβ3 integrin antibody on blood vessels—A pharmacodynamic study

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Summary

Purpose: The integrin αvβ3 is an adhesion molecule expressed by proliferating endothelial cells and antibodies blocking this integrin inhibit angiogenesis in preclinical models. MEDI-522 is a second generation humanized anti-αvβ3 antibody designed for antiangiogenic therapy. The purpose of this study was to examine potential effects of this agent on blood vessels.

Experimental design: In a phase I dose escalation study, MEDI-522 was administered by weekly infusions to 25 adult patients with advanced solid organ malignancies. As a surrogate angiogenesis assay, a wound was created by punch biopsy of the arm skin. This wound site was re-biopsied after a 7-day interval. Dual-label immunofluorescence experiments followed by computer-assisted image analysis were conducted to analyze the vasculature.

Results: Sequential pretreatment and 4-week treatment skin biopsy pairs were available on 4 patients, who had received 6 or 10 mg/kg of MEDI-522. MEDI-522 was detected in the dermal blood vessels as well as the dermal interstitium both in intact and wounded skin sites following treatment. No statistically significant difference was found between pretreatment and treatment samples of skin for vascular area, endothelial cell proliferation and apoptosis, or β3 integrin levels. Phosphorylated focal adhesion kinase (pFAK) was significantly diminished in skin wound vessels during MEDI-522 treatment compared to the pretreatment samples.

Conclusions: MEDI-522 was detectable both in quiescent and in angiogenically active skin blood vessels as well as in the dermal interstitial space. The levels of pFAK were reduced during MEDI-522 treatment, suggesting a modulating effect on this signaling molecule.

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Acknowledgments

Work supported by the National Cancer Institute, UO1 CA62491 (G. Wilding, PI) and NO2-CO-124001 (22XS082A; G. Wilding, PI) and by National Center for Research Resources, MO1 RR03186 (P.M. Farrell, PI).

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Authors and Affiliations

  1. Department of Pathology and Laboratory Medicine, University of Wisconsin, Madison, WI, 53792, USA

    Dahua Zhang, Thomas Pier & Andreas Friedl

  2. University of Wisconsin Comprehensive Cancer Center, Madison, WI, 53792, USA

    Douglas G. McNeel, George Wilding & Andreas Friedl

Authors
  1. Dahua Zhang
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  2. Thomas Pier
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  3. Douglas G. McNeel
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  4. George Wilding
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  5. Andreas Friedl
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Correspondence to Andreas Friedl.

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Zhang, D., Pier, T., McNeel, D.G. et al. Effects of a monoclonal anti-αvβ3 integrin antibody on blood vessels—A pharmacodynamic study. Invest New Drugs 25, 49–55 (2007). https://doi.org/10.1007/s10637-006-9013-8

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  • DOI: https://doi.org/10.1007/s10637-006-9013-8

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