Abstract:
:Chemotherapeutic regimens incorporating taxanes significantly improve outcomes for patients with squamous cell carcinomas of the head and neck (SCCHN). However, treatment with taxanes is limited by toxicities, including bone marrow suppression and peripheral neuropathies. We proposed that conjugating taxanes to targeting carrier molecules would increase antitumor efficacy and decrease toxicity. The cell surface proteoglycan, CD44, is expressed on most SCCHNs, and we hypothesized that it is an attractive candidate for targeted therapy via its natural ligand, hyaluronic acid (HA). We determined whether HA-paclitaxel conjugates were able to decrease tumor growth and improve survival in orthotopic nude mouse human SCCHN xenograft models. HA-paclitaxel concentration-dependent growth inhibition of human SCCHN cell lines OSC-19 and HN5 in vitro, very similarly to free paclitaxel treatment. Tumor cell uptake of FITC-labeled HA-paclitaxel was significantly blocked with free HA, indicating the dependence of uptake on CD44. HA-paclitaxel administered intravenously once per week for three weeks at 120 mg/kg paclitaxel equivalents, far above the paclitaxel maximum tolerated dose, exerted superior tumor growth control to that of paclitaxel in both orthotopic OSC-19-luciferase and HN5 xenograft models in vivo. Mouse survival following HA-paclitaxel administration was prolonged compared with that of controls in mice implanted with either of these xenografts. Mice treated with HA-paclitaxel displayed increased TUNEL(+) cells in tumor tissue, as well as markedly reduced microvessel density compared to those treated with free paclitaxel. No acute histopathological changes were observed in mice treated with HA-paclitaxel. Thus, we conclude that HA-paclitaxel effectively inhibits tumor growth in human SCCHN xenografts via an HA-mediated mechanism and this conjugate should be considered for further preclinical development for this disease.
journal_name
Oral Oncoljournal_title
Oral oncologyauthors
Galer CE,Sano D,Ghosh SC,Hah JH,Auzenne E,Hamir AN,Myers JN,Klostergaard Jdoi
10.1016/j.oraloncology.2011.07.029subject
Has Abstractpub_date
2011-11-01 00:00:00pages
1039-47issue
11eissn
1368-8375issn
1879-0593pii
S1368-8375(11)00770-6journal_volume
47pub_type
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