Fatal anaphylactic shock is common in forensic practice. However, it is difficult to diagnose for lacking specific pathological and morphologic changes in forensic autopsy. The application of some biochemical indicators is of great significance. This paper reviews the biological characteristics of some biochemical indicators and detection methods. The forensic application, problems and prospects of these indicators are also introduced in details. The stable biochemical indicators, IgE, tryptase and chymase, show great potential and advantages in the identification of fatal anaphylactic shock in forensic medicine.
Anaphylaxis/metabolism* ; Autopsy ; Biomarkers ; Chymases ; Forensic Medicine ; Humans ; Tryptases

PURPOSE: The mast cell plays a pivotal role in the human immune response. Crosslinking of 2 IgE molecules bound to the high affinity IgE receptor (FcepsilonRI) on the surface of the mast cell results in mast cell degranulation and the release of several proinflammatory mediators. Patients with type-I allergy have increased levels of IgE in the blood compared to healthy individuals. METHODS: In a 6-week culture system of stem cells to human mast cells we investigated the effect of the concentration of IgE. The mast cells were cultured with different concentrations of IgE for the last 10 days of the maturation period. It was observed how the IgE concentration affects the histamine release, FcepsilonRI density on the mast cell surface and the concentration of other mediators. RESULTS: A clear correlation between IgE concentration in culture medium and the release of histamine upon activation was observed. It showed a bell-shaped dose response curve, with maximal response around an IgE-concentration of 250 ng/mL. Furthermore, the sensitivity of the mast cells and surface density of FcepsilonRI on mast cell surface was also influenced by the IgE concentration in the culture medium. CONCLUSIONS: IgE in the culture medium during the last 10 days of mast cell maturation influences the release of the preformed mediator histamine after mast cell activation and the density of FcepsilonRI on the mast cell surface. The release of the de novo synthetized mediator prostaglandin D2 and the expression of chymase and tryptase are not influenced by IgE in culture medium.
Chymases ; Histamine ; Histamine Release ; Humans ; Hygiene Hypothesis ; Hypersensitivity ; Immunoglobulin E ; Mast Cells ; Prostaglandin D2 ; Stem Cells ; Tryptases

PURPOSE: The mast cell plays a pivotal role in the human immune response. Crosslinking of 2 IgE molecules bound to the high affinity IgE receptor (FcepsilonRI) on the surface of the mast cell results in mast cell degranulation and the release of several proinflammatory mediators. Patients with type-I allergy have increased levels of IgE in the blood compared to healthy individuals. METHODS: In a 6-week culture system of stem cells to human mast cells we investigated the effect of the concentration of IgE. The mast cells were cultured with different concentrations of IgE for the last 10 days of the maturation period. It was observed how the IgE concentration affects the histamine release, FcepsilonRI density on the mast cell surface and the concentration of other mediators. RESULTS: A clear correlation between IgE concentration in culture medium and the release of histamine upon activation was observed. It showed a bell-shaped dose response curve, with maximal response around an IgE-concentration of 250 ng/mL. Furthermore, the sensitivity of the mast cells and surface density of FcepsilonRI on mast cell surface was also influenced by the IgE concentration in the culture medium. CONCLUSIONS: IgE in the culture medium during the last 10 days of mast cell maturation influences the release of the preformed mediator histamine after mast cell activation and the density of FcepsilonRI on the mast cell surface. The release of the de novo synthetized mediator prostaglandin D2 and the expression of chymase and tryptase are not influenced by IgE in culture medium.
Chymases ; Histamine ; Histamine Release ; Humans ; Hygiene Hypothesis ; Hypersensitivity ; Immunoglobulin E ; Mast Cells ; Prostaglandin D2 ; Stem Cells ; Tryptases

OBJECTIVETo evaluate the roles of plasma mast cell carboxypeptidase and chymase in the diagnosis of allergic diseases by measuring the contents of both in children.

METHODSA total of 59 children with allergic diseases and 53 healthy children were recruited into the study. Plasma levels of mast cell carboxypeptidase and chymase were measured using ELISA.

RESULTSThe plasma levels of mast cell carboxypeptidase and chymase in children with allergic children were 1.089 ± 0.752 ng/mL and 0.905(0.375-2.318) ng/mL, respectively, which were significantly higher than those in healthy children [0.593 ± 0.380 ng/mL and 0.454 (0.097-1.077) ng/mL respectively; P<0.05]. There was a significantly positive correlation between plasma mast cell carboxypeptidase and chymase levels in children with allergic diseases (r=0.684, P<0.01).

CONCLUSIONSPlasma levels of mast cell carboxypeptidase and chymase increase in children with allergic diseases, suggesting that mast cell carboxypeptidase and chymase may serve as the indexes for the diagnosis of allergic diseases.

Adolescent ; Carboxypeptidases ; blood ; Child ; Child, Preschool ; Chymases ; blood ; Female ; Humans ; Hypersensitivity ; diagnosis ; enzymology ; Infant ; Infant, Newborn ; Male ; Mast Cells ; enzymology

BACKGROUND: It has been suggested that mast cells are involved in the tumor growth and progression by production of a variety of enzymes and growth factors. They were studied in the 10-dimethyl-1,2 benzanthracene (DMBA)-induced rat mammary tumors, and evaluated in relation with the production of tryptase, chymase, and matrix metalloproteinase (MMP)-2 and MMP-9. METHODS: Preneoplastic and neoplastic breast tissues of Sprague-Dawley female rats were obtained every week after DMBA treatment for 12 weeks. Toluidine blue stain was used for the identification of mast cells. Mast cell tryptase was studied by immunohistochemistry, and chymase by esterase stain. MMP-2 and MMP-9 were measured by Western blotting. RESULTS: The numbers of mast cells in breast cancers were higher than in preneoplastic tissues, and there was a positive correlation between the numbers of tryptase-positive cells and the tumor size. MMP-9 quantity was correlated with the numbers of toluidine blue and chymase positive cells, but not with tryptase-positive cells and tumor size. Both active and inactive forms of MMP-2 and MMP-9 were identified in zymogram. CONCLUSIONS: The mast cells are increased in the DMBA-induced breast cancers, and their tryptase and chymase may play a role in tumor progression with or without participation of MMP-2 and MMP-9.
9,10-Dimethyl-1,2-benzanthracene ; Animals ; Blotting, Western ; Breast ; Chymases ; Female ; Humans ; Immunohistochemistry ; Intercellular Signaling Peptides and Proteins ; Mast Cells* ; Rats* ; Rats, Sprague-Dawley ; Tolonium Chloride ; Tryptases

OBJECTIVETo assess the association of tag single nucleotide polymorphisms (tag SNPs) of chymase gene (CMA1) with essential hypertension in Yi population from Yunnan, China.

METHODSA case-control study was carried out. Four tag SNPs(rs1956921, rs1800876, rs5244 and rs1885108) were genotyped in 303 patients with essential hypertension and 312 healthy controls using polymerase chain reaction - restriction fragment length polymorphism(PCR-RFLP) method.

RESULTSNo significant difference in genotypic and allelic distributions of the four polymorphisms was detected between the two groups(P>0.05), and the same results existed in the females. The frequencies of rs1956921 C allele and a C-T haplotype constructed with rs1956921 and rs5244 were greater in male patients compared with male controls(P<0.01).

CONCLUSIONThe rs1956921 C allele of the CMA1 gene and the C-T haplotype constructed with rs1956921 and rs5244 may be risk factors for essential hypertension in ethnic Yi males from Yunnan.

Adult ; Alleles ; Asian Continental Ancestry Group ; ethnology ; genetics ; Blood Pressure ; China ; ethnology ; Chymases ; genetics ; Essential Hypertension ; Female ; Humans ; Hypertension ; ethnology ; genetics ; physiopathology ; Male ; Middle Aged ; Polymorphism, Single Nucleotide

To screen potential hamster chymase 2 inhibitors, a high-throughput screening (HTS) model was established. Recombinant hamster chymase 2 with active form was cloned and expressed in E. coli. The HTS model with total volume of 50 microL in 384-well microplate was based on fluorescence analysis and was proved sensitive as well as specific (Z' = 0.84). A total of 40 080 samples (including 28 060 compounds and 12 020 natural products) were screened, and 613 samples with inhibition greater than 90% were selected for further rescreening. Finally, compounds J16647 and J16648 were identified with high inhibitory activity on chymase 2, and whose IC50 values were 0.823 and 0.690 micromol x L(-1), respectively.
Animals ; Chymases ; analysis ; antagonists & inhibitors ; Cricetinae ; Enzyme Inhibitors ; analysis ; pharmacology ; Escherichia coli ; metabolism ; High-Throughput Screening Assays ; methods ; Inhibitory Concentration 50 ; Rats ; Structure-Activity Relationship

BACKGROUND: The 26S ubiquitin-proteasome system (UPS) is a principal proteolytic pathway of intracellular molecules regulating apoptosis, cell cycle, cell proliferation or differentiation, inflammation and etc. The recent study suggests that the rs1048990 (C/G) polymorphism of the proteasome subunit alpha type 6 (PSMA6) gene is associated with the increase of the risk of myocardial infarction by the dysregulation of IkappaB degradation. We hypothesized that 26S UPS is important in the development of insulin resistance and type 2 diabetes (T2DM) by controlling the degradation of IkappaB and insulin receptor substances as a substrate. We therefore investigated whether the rs1048990 (C/G) polymorphism of PSMA6 gene and the rs2230087 (G/A) polymorphism of proteasome subunit beta type 5 gene (PSMB5), that is chymotrypsin-like protease determining the rate of proteolysis, are associated with susceptibility to T2DM in Korean subjects. METHODS: We examined the polymorphisms of these genes in 309 diabetic subjects and 170 non-diabetic controls. The polymorphisms of rs1048990 (C/G) and rs2230087 (G/A) were genotyped by real-time PCR. RESULTS: The frequency of the G allele of rs1048990 (C/G) and the A allele of rs2230087 (G/A) polymorphisms was significantly higher in diabetic patients (28% and 13%) compared to that in controls (13% and 1%; P = 0.000 and P = 0.000, respectively). Logistic regression analysis of the rs1048990 (C/G) polymorphism showed that the odds ratio (OR) (adjusted for age, smoking, waist circumference, fasting plasma glucose, systolic blood pressure, HDL-C, triglyceride, and total cholesterol) was 3.93 (95% confidence interval [CI], 2.35-6.59; P = 0.000) for the G allele and 5.09 (95% CI, 2.71-9.57; P = 0.000) for CG and GG genotype when compared with the CC genotype. Logistic regression analysis of the rs2230087 (G/A) polymorphism showed that the adjusted OR was 5.70 (95% CI, 1.63-19.98; P = 0.007) for the A allele and 6.08 (95% CI, 1.66-22.29; P = 0.006) for GA and AA genotype when compared with the GG genotype. In multiple logistic regression analysis with T2DM as the independent Variable rs1048990 (C/G) and rs2230087 (G/A) polymorphisms were the predictor for T2DM. CONCLUSION: We suggest that the G allele of rs1048990 (C/G) polymorphism and the A allele of rs2230087 (G/A) polymorphism may be genetic risk factor to type 2 diabetes mellitus in Korean subjects.
Alleles ; Apoptosis ; Blood Pressure ; Cell Cycle ; Cell Proliferation ; Chymases ; Diabetes Mellitus, Type 2 ; Fasting ; Genotype ; Glucose ; Humans ; Inflammation ; Insulin Resistance ; Logistic Models ; Myocardial Infarction ; Odds Ratio ; Plasma ; Proteasome Endopeptidase Complex ; Proteolysis ; Receptor, Insulin ; Risk Factors ; Smoke ; Smoking ; Waist Circumference

OBJECTIVETo analyze alterations in the gene expression profiles of Velcade-treated K562 cells using bioinformatics methods.

METHODSThe total RNAs of Velcade-treated and control K562 cells were amplified and labeled with fluorescent dyes. The labeled RNAs were hybridized to Agilent Human 1A Microarray, and the raw expression data were processed with Agilent Feature Extraction Software. GeneSifter and GATHER were used for data analysis of the differentially expressed genes to perform gene ontology classification, KEGG pathway analysis, functional protein association network construction and literature mining.

RESULTSTotally 228 differentially expressed genes were identified in the Velcade-treated K562 cells. including 84 up-regulated and 144 down-regulated genes. Chymase 1 gene had the greatest down-regulation by 10.80 folds (log ratio), and interferon alpha-21 gene was also down-regulated by 2.31 folds. Gene ontology classification suggested enhanced aging and leukocyte activity. KEGG pathway analysis showed significant impact of Velcade on JAK-STAT signaling pathway, cytotoxicity mediated by natural killer cells, and antigen processing and presentation pathways. Protein-protein interaction analysis revealed that ubiquitin-dependent protein catabolism, antigen presentation and immune response, as well as JAK-STAT signaling pathway were the major elements of the protein network. Literature mining showed that the differentially expressed genes were strongly associated with terms such as leukemia, apoptosis, cell cycle, proteasome, inhibitor, aging and IkappaB, etc.

CONCLUSIONSVelcade may inhibit the cell survival pathways such as NF-kappaB and JAK-STAT signaling pathways to enhance the cytotoxicity and inducing tumor cell apoptosis. Velcade might also be involved in antigen processing and presentation, immune response and inflammation. Chymase 1 gene is probably the key target of Velcade.

Antineoplastic Agents ; pharmacology ; Apoptosis ; drug effects ; Boronic Acids ; pharmacology ; Bortezomib ; Chymases ; genetics ; Gene Expression Profiling ; Gene Expression Regulation, Neoplastic ; drug effects ; Humans ; K562 Cells ; Oligonucleotide Array Sequence Analysis ; methods ; Pyrazines ; pharmacology

BACKGROUNDLittle is known about the role of dual angiotensin II forming pathways during heart failure. In the present study, the changes of chymase and angiotensin converting enzyme (ACE) expressions in the failing hearts of hamsters were analysed.

METHODSHeart failure was induced by ligation of left anterior descending branch of the coronary artery. Chymase, ACE and angiotensin II type 1 receptor (AT1R) mRNA levels were analysed by reverse transcription polymerase chain reaction (RT-PCR). The activities of chymase and ACE were determined by radioimmunoassay (RIA). Myocardial collagen fibre analysis was performed under optical microscope.

RESULTSLeft ventricular systolic pressure (LVSP) and maximum left ventricular developed pressure increase rate (dp/dtmax, mmHg/s) gradually moved lower at 2, 3, 4 and 8 weeks after operation. On the other hand, left ventricular end-diastolic pressure (LVEDP) increased gradually after operation. Compared with the control group (3.55 +/- 0.06, 4.79 +/- 0.70), the heart weight/body weight ratio in operation group had increased significantly at 4 weeks and 8 weeks (4.28 +/- 0.43, 6.17 +/- 0.73) (P < 0.01). Collagen staining showed that the quantity of myocardial collagen fibre increased significantly in the operation group. RT-PCR showed that the chymase mRNA level in the operation group was consistently greater than that in the control group. AT1R mRNA level was also increased significantly at 3 weeks and 4 weeks, both being 1.3 times that of the control group (P < 0.01), whereas ACE mRNA level was not changed. Higher activity of chymase was detected in operation group, being 4, 8, 13 and 19 times that of the control group at 2, 3, 4 and 8 weeks (P < 0.01), respectively. ACE activity was also significantly higher at the same time, being 7, 10, 10 and 3.5 times that of the control (P < 0.01). Angiotensin II (Ang II) level in operation group increased significantly, being 2.5, 2.7, 3.5 and 2 times that of the control group at 2, 3, 4 and 8 weeks, respectively (P < 0.01).

CONCLUSIONSA dual Ang II forming pathway from both ACE and chymase in the hamster hearts plays an important role during the development of heart failure. At the decompensatory stage, the reduction of AngII level may be associated with the decrease of ACE activity.

Angiotensin II ; analysis ; Animals ; Body Weight ; Chymases ; Cricetinae ; Heart Failure ; metabolism ; Male ; Myocardium ; metabolism ; Peptidyl-Dipeptidase A ; genetics ; physiology ; RNA, Messenger ; analysis ; Receptor, Angiotensin, Type 1 ; genetics ; Reverse Transcriptase Polymerase Chain Reaction ; Serine Endopeptidases ; genetics ; physiology ; Ventricular Function, Left