Objective To observe the effect of paclitaxel long-circulating thermo-sensitive liposome ( PLTL) on inhibiting the growth of transplanting Lewis lung cancer cells in C57BL/ 6 mice. Methods The model of mice carried Lewis lung cancer was established. 40 tumor-bearing mice were divided into five groups randomly: blank control group, model control group, PTX group, PTL group and PLTL group, 8 mice for each group. The blank control group and the model control group were injected with 0. 9% sodium chloride solution. In PTX group, PTL group and PLTL group, the dose of per injection was calculated with the reference of PTX for 20 mg·kg-1 , diluted with 0. 9% sodium chloride solution, and the mice were injected via the tail vein with a volume of 0. 2 mL each time. Except for the blank control group, 5 minutes after administration, the tumors of the other groups were subjected to local hyperthermia at (42±0. 5) ℃ for 30 min. During the treatment period, transplantation tumor growth was observed; pathological morphology changes of tumor tissues and cells were detected by HE stain; apoptosis rate of tumor cells was determined by flow cytometry to investigate the inhibition effect of PLTL combined with local thermal therapy on the tumor. Results The inhibition rate of tumor in model control group, PTX group, PTL group and PLTL group was 21. 81% , 48. 87% , 57. 22% and 78. 87% , respectively. The apoptosis rate of tumor cells was (20. 4 ± 4. 2)% , (42. 7 ± 3. 8)% , (54. 6±2. 9)% and (69. 7±5. 0)% , respectively. Observed by pathology, apoptosis rate and necrosis number of tumor cells in PLTL group were significantly increased. Conclusion Compared with PTX and PTL, PLTL has an evident thermo-sensitive feature and can increase the anticancer effect of paclitaxel remarkably when combined with local hyperthermia.

Objective To investigate the tumor inhibition effect of paclitaxel long-circulating thermo sensitive liposomes (PLTL) in mice bearing Lewis lung carcinoma cells. Methods A tumor-bearing mouse model was established, and the mice were randomly divided into five groups: control, heating, paclitaxel (PTX), paclitaxel thermo sensitive liposomes (PTL), and PLTL groups. The living status was observed in the mice. The volume and weight of the tumor were measured. The morphological changes in the tumor cells were observed f by HE staining and apoptosis of the tumor cells was determined by flow cytometry. Results The inhibition rate of tumor in PTX, PTL and PLTL groups was 48.87%, 57.22%and 78.87%, respectively. The apoptotic rate of tumor cell in PTX, PTL and PLTL groups was (42.7 ± 3 .8)%, (54.6 ± 2.9)%and (69.7 ± 5.0)%, respectively. Conclusions PLTL, as compared with PTX and PTL, has an evident thermo sensitive feature and increases the anticancer effect of paclitaxel remarkably in combination with local hyperthermia.