Pediatric primary nephrotic syndrome patients comprehensive detection of plasma protein Z and coagulation factor Ⅷ activity analysis / 国际检验医学杂志

Objective To investigate the changes of plasma protein Z and coagulation factor Ⅷ activity in children with primary nephrotic syndrome.Methods 94 children with primary nephrotic syndrome were se-lected as the observation group,and 63 healthy children were selected as the control group.The blood samples of peripheral blood were collected from the study group,and plasma protein Z and coagulation factor Ⅷ were measured by enzyme linked immunosorbent assay.Enzyme linked immunosorbent assay was used to measure plasma protein Z and coagulation factor Ⅷ.The changes of plasma protein Z and coagulation factor Ⅷ in the two groups were compared,and the changes of plasma protein Z and coagulation factor Ⅷ in the acute and re-covery phase,and the correlation between plasma protein Z and coagulation factor Ⅷ were observed.Results The observation group of plasma protein Z level is lower than the control group,blood coagulation factor Ⅷlevels higher than the control group,and the difference was statistically significant(P<0.05);plasma protein Z level in acute stage is lower than the recovery period,and coagulation factor Ⅷ level is higher than the recov-ery period,the differences were statistically significant(P<0.05);plasma protein Z and coagulation factor Ⅷwas negatively correlated.Conclusion The plasma protein Z level in children with primary nephrotic syn-drome is significantly reduced,and the activity of coagulation factor Ⅷ is significantly increased.Detection of plasma protein Z and coagulation factor Ⅷ level can predict primary nephrotic syndrome in children.

Purification and enzyme activity assay of filamentous temperature-sensitive protein Z in Streptococcus suis serotype 2 / 中国人兽共患病学报

We conducted purification of filamentous temperature-sensitive protein Z of Streptococcus suis serotype 2 (S.suis 2) and measured its GTPase activity.The ftsz gene in the genome of the Chinese 05ZYH33 strain of S.suis 2 was successfully amplified using PCR,and then the ftsz gene was cloned into prokaryotic expression plasmid pET28a,and the recombinant plasmid pET28a-ftsz was transformed into E.coli BL21.After induction by IPTG,the isolated FtsZ protein was analyzed with SDS-PAGE.Then the recombinant protein was purified by Ni2+-NTA affinity chromatography.The rabbit serum was harvested after immunization with recombinant FtsZ protein,and was analyzed by indirect ELISA and Western blotting.The GTPase activity of FtsZ was measured with the malachite green method.Results showed that successfully constructed recombinant plasmid pET28a-ftsz and the recombinant protein with high purity was obtained;Western blot result indicated that FtsZ could react with the His-tag antibody and the rabbit serum;the polyclonal antibody titer of the rabbit serum reached 1 ∶ 13 107 200;FtsZ have GTPase activity.We successfully prepared S.suis 2 recombinant protein FtsZ having GTPase activity and high titer antiserum would be useful for the further study of S.suis 2 cell division mechanism.

Relationship between plasma protein Z level and severity of coronary atherosclerosis in patients with coronary heart disease / 中国医师进修杂志

Objective To explore the relationship between plasma protein Z level and severity of coronary atherosclerosis in patients with coronary heart disease,and analyze the clinical value of plasma protein Z detection.Methods Eighty-five patients who undertaken coronary arteriography were selected,and the patients were divided into coronary heart disease group (63 patients) and control group (22 patients)according to coronary arteriography results.The patients in coronary heart disease group were divided into three groups according to the Gensini score:A group (≤30 scores),B group (31-60 scores) and C group (＞ 60 scores).All patients' plasma was collected and stored at-80 ℃ until examined,and the plasma PZ level was detected by enzyme-linked immunosorbent assay method.Results The plasma protein Z level in coronary heart disease group was significantly lower than that in control group [(721.82 ± 289.53) μ g/L vs.(1 077.80 ± 338.12) μ g/L],and there was statistical difference (P＜ 0.05).The plasma protein Z level in A group,B group and C group was (856.09 ± 312.53),(665.27 ± 267.15) and (643.04 ±248.39) μg/L,respectively.The plasma protein Z level in B group and C group was significantly lower than that in A group,and there was statistical difference (P ＜ 0.05),but there was not statistical difference between C group and B group (P ＞ 0.05).There was negative correlation between the plasma Z level and Gensini score (r =-0.300,P =0.017).In coronary heart disease group,the plasma Z level in patients with smoking was significantly lower than that in patients without smoking [(687.83 ± 249.94) μ g/L vs.(844.29 ± 454.71) μ g/L,and there was statistical difference (P ＜ 0.05).There was negative correlation between the plasma Z level,age and hypersensitive C reactive protein (r =-0.349,-0.339,P ＜ 0.05).Conclusions Plasma protein Z level in patients with coronary heart disease is significantly decreased,and the plasma protein Z level has negative correlation with the severity of coronary atherosclerosis.Smoking can induce the decrease of plasma protein Z level,and the decrease of protein Z level maybe a predictor for coronary heart disease.

Changes in Plasma Levels of Natural Anticoagulants in Disseminated Intravascular Coagulation: High Prognostic Value of Antithrombin and Protein C in Patients with Underlying Sepsis or Severe Infection

BACKGROUND: Dysfunctional natural anticoagulant systems enhance intravascular fibrin for mation in disseminated intravascular coagulation (DIC), and plasma levels of natural anti coagulants can be used in the diagnosis and prognosis of DIC. Herein, the diagnostic value of 4 natural anticoagulants was assessed, and the prognostic value of antithrombin and protein C were validated in a large population. METHODS: Part 1 study included 126 patients with clinically suspected DIC and estimated plasma levels of 4 candidate anticoagulant proteins: antithrombin, protein C, protein S, and protein Z. Part 2 comprised 1,846 patients, in whom plasma antithrombin and protein C levels were compared with other well-known DIC markers according to the underlying dis eases. The 28-day mortality rate was used to assess prognostic outcome. RESULTS: Antithrombin and protein C showed higher areas under the ROC curve than pro tein S and protein Z. In part 2 of the study, antithrombin and protein C levels significantly correlated with DIC score, suggesting that these factors are good indicators of DIC severity. Antithrombin and protein C showed significant prognostic power in Kaplan-Meier analyses. In patients with sepsis/severe infection, antithrombin and protein C showed higher hazard ratios than D-dimer. Platelet count showed the highest hazard ratio in patients with hemato logic malignancy. In patients with liver disease, the hazard ratio for antithrombin levels was significantly high. CONCLUSIONS: Decreased plasma anticoagulant levels reflect florid consumption of the phys iologic defense system against DIC-induced hypercoagulation. Plasma antithrombin and protein C levels are powerful prognostic markers of DIC, especially in patients with sepsis/severe infection.

Protein Z, protein Z-dependent protease inhibitor and stroke / 国际脑血管病杂志

Protein Z (PZ) is a vitamin K-dependent protein. As a cofactor for the protein Z-dependent protease inhibitor (ZPI), it inhibits coagulation factor X under the existence of phospholipid and calcium ion, and increases the ZPI activity by nearly 1000-fold, thus it plays a role in the process of thrombosis. ZPI inhibits coagulation factor Ⅺ a alone. ZPI activity is also consumed in the process of inhabiting factor Ⅹa and Ⅺa. This article reviews the biological characteristics of PZ and ZPI and their association with stroke.

Protein Z and Stroke / 国际脑血管病杂志

Protein Z is a vitamin K-dependent glycoprotein synthesized in liver.It plays an important role in regulating coagulation process,and may be an independent risk factor for stroke,The studies of protein Z help us have a deep understanding of the effect of protein Z in the early diagnosis,prevention and treatment of stroke.

Protein Z intron FG79A polymorphisms are not associated with coronary artery disease / 中国病理生理杂志

AIM:To investigate the distribution of protein Z intron FG79A polymorphisms in Chinese and the associations with coronary artery disease(CAD).METHODS:148 patients were performed selected coronary angiography and more than one major coronary vessel with at least 50% stenosis was defined as CAD.The control group consisted of 147 subjects.The protein Z intron FG79A polymorphisms were studied by polymerase chain reaction and restriction fragment length polymorphism and parts of PCR products were sequenced.RESULTS:Protein Z intron FG79A polymorphisms were first recovered in Chinese,and the frequencies of G and A alleles were 44.24% and 55.76%,respectively.The frequencies of two alleles were not significantly different between patients and controls.There was no significant difference in protein Z intron FG79A genotype distribution among patients with one,two or three stenosed vessels.No significant difference was found among the frequencies of the three genotypes between both acute coronary syndrome(ACS)and non-ACS.CONCLUSION:Protein Z intron FG79A polymorphisms are present in Chinese.Protein Z intron FG79A polymorphisms were not associated with CAD and ACS.