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Open Access Research article

Oxaliplatin long-circulating liposomes improved therapeutic index of colorectal carcinoma

Chuang Yang12, Hai Z Liu3, Zhong X Fu1* and Wei D Lu1

Author Affiliations

1 Department of Gastrointestinal Surgery, First Affiliated Hospital, Chongqing Medical University, Chongqing 400016, Chongqing, China

2 Department of Hepatobiliary Surgery, Mianyang Third People's Hospital, Mianyang 621000, Sichuan Province, China

3 Departments of Gynecology and Obstetrics, Second Affiliated Hospital, Chongqing Medical University, Chongqing 400016, Chongqing, China

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BMC Biotechnology 2011, 11:21  doi:10.1186/1472-6750-11-21

Published: 15 March 2011

Abstract

Background

Cytotoxic drugs are non-selective between normal and pathological tissue, and this poses a challenge regarding the strategy for treatment of tumors. To achieve sufficient antitumor activity for colorectal carcinoma, optimization of the therapeutic regimen is of great importance. We investigated the ability of oxaliplatin long-circulating liposomes (PEG-liposomal L-oHP) to provide an improved therapeutic index of colorectal carcinoma.

Results

We determined that PEG- liposomes conjugated with cells at 2 h, with a mean fluorescence intensity that was enhanced upon extended induction time. The PEG-liposomal L-oHP induced a significant apoptotic response as compared with free L-oHP, 23.21% ± 3.38% vs. 16.85% ± 0.98%, respectively. Fluorescence imaging with In-Vivo Imaging demonstrated that PEG- liposomes specifically targeted tumour tissue. After intravenous injections of PEG-liposomal L-oHP or free L-oHP, the tumour volume suppression ratio was 26.08% ± 12.43% and 18.19% ± 7.09%, respectively, the percentage increased life span (ILS%) was 45.36% and 76.19%, respectively, and Bcl-2, Bax mRNA and protein expression in tumour tissue was 0.27-fold vs. 0.88-fold and 1.32-fold vs. 1.61-fold compared with free L-oHP, respectively.

Conclusion

The PEG-liposomal L-oHP exhibited a tendency to target tumour tissue and demonstrated a significantly greater impact on apoptosis compared to free oxaliplatin.