The protective effect of chlorogenic acid on bovine mammary epithelial cells and neutrophil function

Chlorogenic acid (CGA) is the ester of caffeic acid and quinic acid and plays an important role in antibacterial activity and anti-inflammatory properties. The objective of this study was to examine the effects of CGA on the growth of Staphylococcus aureus and the mRNA levels of the genes encoding the inflammatory response cytokines, κ-casein, and neutrophil function in bovine mammary epithelial cells (BMEC) exposed to S. aureus. Chlorogenic acid has important antibacterial, antioxidant, and anti-inflammatory functions; however, the effect of CGA on BMEC and neutrophils exposed to S. aureus has not been investigated previously. Our results demonstrated that 10, 20, and 30 μg/mL CGA had no cytotoxic effects on BMEC in culture, and that 20 μg/mL CGA enhanced the viability of BMEC exposed to S. aureus, whereas 30 μg/mL CGA reduced S. aureus growth after 9 h compared with controls. The rate of S. aureus invasion into BMEC was also attenuated by 30 μg/mL CGA compared with controls, whereas this treatment led to reduced abundance of IL6, IL8, and TLR2 mRNA in S. aureus-exposed BMEC. Migration of bovine polymorphonuclear leukocytes was significantly decreased in S. aureus-exposed BMEC with 10 and 20 μg/mL CGA treatment when compared with S. aureus treatment alone. In addition, incubation with 20 or 30 μg/mL CGA enhanced the phagocytic ability of polymorphonuclear leukocytes compared with the control group. Importantly, levels of κ-casein were enhanced by treatment of S. aureus-exposed BMEC with CGA. Our results suggest that the use of CGA may be a potent therapeutic tool against bovine mastitis caused by S. aureus.

[Analysis of prognosis of severe hepatitis]

OBJECTIVE

To study the effect of prognosis of severe hepatitis.

METHODS

The prognosis factors of 286 patients with severe hepatitis were studied with monofactor analysis(chi 2 test, t test) and polyfactors analysis(logistic regressive analysis).

RESULTS

The factors affected the prognosis of the patients were age, therapeutics, biochemistry data and complications.

CONCLUSION

To decrease the mortality of the patients with severe hepatitis, we should adopt rational therapeutics and prevent complications in clinical practice.

Quantification of circulating schistosome antigen by monoclonal antibody-based enzyme-linked immunosorbent assay

A two-site enzyme-linked immunosorbent assay (2S-ELISA) was developed for the quantification of gut-associated schistosome circulating anodic proteoglycan (GASCAP) of Schistosoma japonicum using a monoclonal antibody (McAb M120), purified by one-step hydroxylapatite (HAP) chromatography, as both solid phase and peroxidase-conjugated reagent. In this system, a high detectable level of serum GASCAP concentration (0.25 microgram/L) could be achieved with the immunoaffinity purified GASCAP being used as the standard. The specificity of the assay was 97.2%, with minimized interference of rheumatoid factor. The intra-assay (4.01%) and interassay (6.09%) coefficients of variation and the mean analytical recovery (101.4%) for GASCAP demonstrated the precision and accuracy of the assay.

A further study on capillary-like bile ductules proliferation in chronic active hepatitis

64 cases of chronic active hepatitis (CAH) and 84 cases of non-CAH liver diseases were studied with keratin stain. The capillary-like bile ductules (CLBD) were proliferating and their morphology was identical to that with Type V collagen stain reported before. CLBD proliferation were more marked in CAH than in other liver diseases, and it was considered to be one of the characteristics of CAH and could be used for differential diagnosis. The ultrastructure of CLBD was specific in morphology. The HBV-DNA in CLBD shown by the technique of in situ hybridization suggested that HBV might infect the cells of CLBD.