The activity of the negative regulator of cell cycle, P27, affects the normal process of cell cycle. As a type of cell cycle diseases, tumor is closely correlated with the activation of P27. It is shown that the level of P27 decreases in most kinds of tumors.By its influence on cell proliferation and apoptosis, P27 plays an important role in the occurrence and development of tumor. The activity of P27 is regulated by several pathways either at or after transcription, so various ideals which directly change the protein level of P27 or indirectly interfere the activities of elements in regulative pathways of P27 will provide many novel and efficient ways for therapies in tumors.

Ehrlich's ascites cancer (EAC) in BALB/C mice by ip transplantable EAC cell is reproduced by us. The change of serum malondialdehyde(MDA), plasma cellular cAMP and adenylate cyclase (AC) are examined in the early, middle and late phase of mice bearing EAC respectively in comparison with that of control group. Results indicate that serum MDA in mice bearing EAC is continuously increased with the progress of the disease in the remarked ways in comparison with the control group. Whereas the plasma cAMP in the mice bearing EAC is markedly decreased in that order. Relation between the change of serum MDA and the cellular cAMP, AC or plasma cAMP shows a significant negative correlation efficiency (P

Nasopharyngeal carcinoma (NPC) in BALB/c nude mice (NM) was re-produced by hypodermic implanting human CNE-2 cell to the right-side of neck-backposi-tion. The changes of plasma malondialdehyde (MDA) and cAMP/cGMP ratio in NM bea-ring human NPC were examined. Meanwhile, we observed that tumor's size, plasma MDAand cAMP/cGMP ratio in NM bearing human NPC were affected by polysacchoridopetide(PSP). Results indicated that in comparison with the control group, NM bearing humanNPC showed a marked increase in plasma MDA(18.25?1.37 nmol/ml),cAMP/cGMP ratio(4.55?0.35), a marked decrease in plasma, cAMP (71.83?8.51 pM/ml) and cGMP(15.77?0.65 pM/ml), both high or low-concentration PSP inhibited NPC growth.Rate of inhibition was between 59.58 to 95.53 percent. PSP decreased plasma MDA,elevated cAMP, cGMP's levels and recovered cAMP/cGMP ratio. Our results suggestedthat the elevated level of MDA in NM bearing human NPC was closely associated withthe presence of NPC. PSP had antitumor effect, probably by means of decreasing freeradicals and recovering cAMP/cGMP ratio.

AIM: To investigate the changes of plasma glutathione peroxidase (GSH-PX) and catalase (CAT) activities in nude mice (NM) bearing human nasopharyngeal carcinoma (NPC) and observe the effect of naja naja atra venom (NNAV) on them. METHODS: Plasma GSH-PX and CAT activities in human NPC bearing NM treated ( i.p. ) by low, middle or high concentration NNAV solution (1 mg/L, 5 mg/L, 10 mg/L) were determined by colorimetry. RESULTS: Plasma CAT activity (16 450 U/L) in NM bearing tumor group decreased significantly in comparison with the control group (20 680 U/L)(P0.05). Treated by low, middle or high concentration NNAV solution, CAT activities of three NM bearing tumor groups (20 570 U/L, 23 090 U/L, 21 280 U/L ) were higher than that of the NM bearing tumor group without NNAV treatment (16 450 U/L) (P0.05). GSH-PX activities of the three groups (especially high concentration group) were higher than that of the group without NNAV treatment (P

Objective To study the primer design for Penta D and Penta E genotyping and investigate the genetic polymorphisms of these two loci in Chinese Han population in Wuhan.Methods 281 unrelated Chinese individuals living in Wuhan were typed by hot-start PCR with re-designed Penta D and Penta E genotyping primers and PAGE technique,and the results were compared with those by the PowerPlex TM 16 system of Promega.Results The amplified fragment size of Penta D and Penta E loci with re-designed primers ranged between 153～198bp and 107～212bp respectively,which were consistent with the results obtained by the re-designed primers and PowerPlex TM 16 system,and the re-designed primers had a higher sensitivity than PowerPlex TM 16 system (0.2ng vs 0.5ng) by silver staining.10 and 21 alleles were observed for Penta D and Penta E in Chinese Han population in Wuhan,and the genotype distributions of the two loci were in accordance with Hardy-Weinberg equilibrium.Family studies confirmed Mendelian inheritance of alleles.The power of discrimination (DP) for Penta D and Penta E were 0.926 2 and 0.986 0,and the power of exclusion (PE) were 0.665 1 and 0.832 5 respectively.Conclusion The re-designed primers for Penta D and Penta E genotyping are reliable.These two loci are highly polymorphic in Chinese Han population and can be used in forensic identification and paternity test.

AIM: To investigate the angiogenesis in the process of sarcoma 180 (S_(180)) tumor transplantation and changes of regulator factors, and explore the possible mechanism. METHODS: The S_(180) transplanted tumor in the Km mouse was used to detect the tumor angiogenesis by immunohistochemical examination of FⅧ. The levels of VEGF (V) and endostatin (E) in serum and the homogenate of tumor tissue were measured by ELISA and EIA, and the correlation between tumor weight and microvessel count (MVC) and morphology in tumor was also analyzed by multiple ANNOVA method. RESULTS: MVC, the relative count of total vessels and relative total vessel area increased with the development of transplanted S_ 180 . VEGF level in tumor tissue were higher at the 10th and 15th day than the 5th day after tumor transplantation. Endostatin in the tumor tissue and serum both reached the highest level at the 15th day, V/E ratio did not changed in this process. Furthermore, MVC, average vessel area and relative total area had a significant correlation with tumor weight. CONCLUSION: MVC increases in the development of S_(180) transplantation tumor and is related with the tumor weight; the positive regulator of angiogenesis in the tumor tissue is up-regulated during tumor growth, and the regulators in the tumor tissue maintains a relative balance.

Objective To determine the difference between the measured(Cm) and the target rocuronium plasma concentration(Cp) in geriatric patients given by target-controlled infusion(TCI) during laparoscopic rectectomy or colectomy,and to evaluate the performance of the rocuronium TCI system(Szenohradszkay model).Methods Twenty-four ASA I～II patients aged 65～81 years old received selective laparoscopic rectectomy or colectomy.After induction,all patients received rocuronium by TCI system.The beginning Cp was 1000 ng/ml,then increased to 1300,1600,1900,2200,and 2500 ng/ml,according to the neuromuscular transmission response.The endpoint of Cp was determined when the T1 was maintained at 5%～10%.Radial arterial blood samples were taken before anesthesia and before the adjustment of Cp each time,to determine the plasma concentration of rocuronium by using HPLC/MS.We used parameters of bias,precision,and wobble to evaluate the performance of the TCI system. Results The endpoint Cp(when the T1 was maintained at 5%～10%) was 1600 ng/ml in 2 patients,1900 ng/ml in 5 patients,2200 ng/ml in 9 patients,and 2500 ng/ml in 8 patients.The bias,precision,and wolbble of the rocuronium TCI system were 4.69%,14.93%,and 17.24%,respectively. Conclusions The rocuronium TCI system with Szenohradszkay pharmacokinetic model is clinically acceptable for Chinese geriatric patients.

Objective To investigate the pharmacodynamics of rocuronium by targeted-controlled infusion(TCI)during laparoscopy in elderly and adult patients.Methods A total of 31 patients undergoing selective laparoscopy operation from the Department of Gynecology and Department of General Surgery were divided into elderly group(aged 65-81 years,n=17)and adults group(aged 18-55 years,n=14).Under general anesthesia,rocuronium was infused intravenously using a TCI system.The upper limb without intravenous infusion was employed for TOF.The target plasma concentration(Cpt)was started from 1.0 ?g/ml,and then increased to 1.3,1.6,1.9,2.2,and 2.5 ?g/ml successively according to the neuromuscular response to the TOF stimulation.The endpoint of Cpt was determined when the T1 was blocked by 90%-95%.After terminating the infusion,the time to recovery of T1 to 25%,TOF ratio to 0.7,and recovery of index were recorded.T1 scales with each Cpt and the rates of rocuronium infusion were also recorded.Results T1 scales with each Cpt were significantly lower in the elderly patients than those in the adults(P