In vivo study of radiosensitization by Topotecan on nasopharyngeal carcinoma / 中国耳鼻咽喉头颈外科

OBJECTIVE To study the radiose-nsitization by Topotecan on human nasopharyngeal carcinoma in nude mice. METHODS ①To study the maximum tolerance dose of TPT and detect the effective rate of TPT and RT on nude mice. ② Plan of radiosensitization practice:53 nude mice xenografts were distributed to 5 groups:RT 20 Gy group,RT 40 Gy group,TPT 12.5 mg/kg group,TPT 12.5 mg/kg+RT 20 Gy group and the controlgroup. After treatment,the volume of tumors were measured every 3 days in order to value the effective rate [complete remission(CR) + partial remission(PR) ]and regrowth delay time(TGD) and to fit the growth curve. RESULTS This study showed that the effective rates had significant difference among RT20 Gy+TPT 12.5 mg/kg group,RT20 Gy group and TPT12.5 mg/kg group,while that of RT20 Gy +TPT 12.5 mg/kg group and RT40 Gy group had no statistical difference. SER reached to 1.34. CONCLUSION Topotecan has been shown a radiosensitizing effect on human nasopharyngeal carcinoma in vivo.

Impedance effects of interleukin-6 on cyclophosphamide-induced hematopoietic damnification in dogs / 生物医学工程学杂志

The aim of this study is to evaluate the effect of Interleukin-6 on cyclophosphamide-induced hematopoietic damnification. The doses of Interleukin-6 in 3 different regimens were hypodermally injected into dogs for 7 days respectively to establish the cyclophosphamide-induced hematopoietic damnification model. The effect of Interleukin-6 on the production of platelets and the amount of other cells in the dogs' bone marrow were determined on the 21st day. The results showed that Interleukin-6 significantly alleviated the reduction of platelet count and recovered the platelets level faster. The impedance effects of Interleukin-6 directed against hematopoietic damnification of bone marrow and spleen were shown by pathological examination. These suggest that the Interleukin-6 can significantly impede cyclophosphamide-induced hematopoietic damnification.

Restoring the skin from traumatism by means of collagen-konjac glucomannan-chondroitin sulfate blend film / 生物医学工程学杂志

This study aims at restoring the skin from traumatism by use of the collagen(from piglet skin) and konjac glucomannan-chondroitin sulfate blend film. The 2 cm x 4 cm skin traumatism model was established on both sides of the waist spinal column in 14 New Zealand rabbits each weighing 1.5-2.0 kg. One side was covered with blend film, the other side was used as a control. Then the changes of the skin traumatism were observed at different time-points after the operation, the wound tissue samples were taken for histological examination. The blend film could prevent skin traumatism from bleeding and infection. The skin traumatism treated by blend film showed signs of rectangle scab and the control showed signs of linear scab after healing. No obvious immune rejection was seen. The collagen-konjac glucomannan-chondroitin sulfate blend film can accelerate the restoration of skin from traumatism.