Preparation, characterization and immune response of chitosan­gold loaded Myricaria germanica polysaccharide.

In this study, a novel nano-drug delivery system (CS-Au NPs) based on gold nanoparticles (Au NPs) and chitosan (CS) that modified Myricaria germanica polysaccharide (MGP) was developed to enhance immune responses. At a MGP to CS Au ratio of 5:1, CS-Au-MGP NPs had a loading capacity of 78.27 %. The structure of CS-Au-MGP NPs were characterized by Transmission electron microscope, TEM-energy dispersive spectroscopy mapping, Fourier transform infrared spectroscopy, X-ray photoelectron spectrometer, particle size and zeta-potential distribution analysis. Under weakly acidic conditions, in vitro CS-Au-MGP NPs release was most effective. In vivo showed that co-immunization with CS-Au-MGP NPs and PCV2 significantly increased the organ index of the thymus, spleen, and liver in mice. Additionally, CS-Au-MGP NPs significantly increased the levels of IgG, IgG1, and IgG2a antibodies, as well as IFN-γ and IL-6 levels. Furthermore, the CS-Au-MGP NPs promoted proliferation of spleen T and B lymphocytes, increased the number of CD3+, CD4+, and CD8+ cells, and increased the CD4+/CD8+ T cell ratio. Meanwhile, CS-Au-MGP NPs remarkably TLR2/IRAK4 pathway activation and mRNA levels of cytokines (IFN-γ and IL-6). These results indicated that CS-Au-MGP NPs could enhance the immune activity, and it could be potentially used as an MGP delivery system for the induction of strong immune responses.

Detection of haptoglobin and serum amyloid A as biomarkers in naturally infected Mycoplasma bovis calves.

The livestock sector of Pakistan is increasing rapidly and it plays important role both for rural community and national economy. It is estimated that almost 8 million rural people are involved in livestock rearing and earning about 35-40 % of their income from the livestock sector. Mycoplasma bovis (M. bovis) infection causes significant economic losses in dairy animals especially young calf in the form of clinical illnesses such as pneumonia, poly-arthritis, respiratory distress and mortality. M. bovis is hard to diagnose and control because of uneven disease appearance and it is usually noticed in asymptomatic animals. For the identification of M. bovis in sub-clinical and clinical samples, determination of acute phase proteins i.e., haptoglobin (Hp) and serum amyloid A (SAA) are important tools for the timely diagnosis of disease. Therefore, early diagnosis of disease and hemato-biochemical changes are considered beneficial tools to control the infectious agent to uplift the economy of the dairy farmers. For this purpose, blood samples were collected from 200 calves of Bovidae family. Serum was separated from blood samples to determine the concentration of Hp and SAA, while blood samples were processed to determine hematological changes in blood from calves by using hematological analyzer. The blood plasma obtained from the blood samples was processed to measure oxidative stress factors. Lungs tissues from slaughterhouses/ morbid calves were collected to observe histopathological changes. The results of present study indicated that level of SAA and Hp remarkably increased (P < 0.05) in M. bovis infected calves in comparison to healthy calves. The oxidative stress markers indicated that nitric oxide and MDA levels in the infected calves increased significantly (P < 0.05), while infected claves had considerably lower levels of superoxide dismutase, catalase and glutathione. These findings indicate that oxidative stress play role to increase the level of APPs, while monitoring of APPs levels may serve as a valuable addition to the clinical evaluation of naturally infected calves with M. bovis. The hematological parameters were decreased significantly (P < 0.05). Altogether, this study suggests that Hp and SAA are proposed as promising biomarkers for detecting naturally occurring M. bovis infection in calves.

Optimization of Hericium erinaceus polysaccharide-loaded Poly (lactic-co-glycolicacid) nanoparticles by RSM and its absorption in Caco-2 cell monolayers.

In present study, HEP was successfully encapsulated into the Poly (lactic-coglycolicacid) (PLGA) to constitute the HEP-PLGA. The effects of three independent factors (the proper range of ratio of organic phase (o) to internal water phase (w1) (X1), ratio of external water phase (w2) to the primary emulsion (PE) (X2), and the concentration of PLGA (X3) on the extraction yield of encapsulation efficiency (EE) from the HEP was optimized using response surface methodology. The optimal extraction conditions for HEP-PLGA were determined as follows: X1: 8:1, X2: 7:1 and X3: 20 mg·mL-1. Under these optimal conditions, the mean experimental EE 90.86 ±â€¯0.576% was corresponded well with the predicted value of 91.81%. In addition, to investigate the transport properties of HEP and HEP-PLGA using a Caco-2 cell monolayer, and study the roles of the efflux transporters (P-gp) during the transport process. These results suggested that HEP can be absorbed more efficiently when encapsulated within the PLGA. These findings highlight the potential to the application of HEP in the formulation of functional foods. These results provide strategies in designing high absorbed polysaccharides with bioactive benefits.

Immunomodulatory effects of hydroxyethylated Hericium erinaceus polysaccharide on macrophages RAW264.7.

Hericium erinaceus polysaccharide (HEP) has been shown to possess a variety of biological activities. In present study, HEP was successfully modified to obtain its hydroxyethylated derivative hHEP. Its potential immunomodulatory activities on RAW264.7 macrophages were investigated. Results showed that the hHEP were significantly stronger than that of the corresponding unmodified polysaccharide, HEP. Meanwhile, the NO, IL-6 and TNF-α production activities of macrophages were enhanced in the RAW264.7 macrophages by stimulation of hHEP. In addition, the hHEP increase significantly higher iNOS expression than HEP. These results indicated that the hydroxyethylated derivative hHEP could enhance the activation of peritoneal macrophages, and hydroxyethylation modification can enhance the immunomodulation function of HEP.

Selenizing Hericium erinaceus polysaccharides induces dendritic cells maturation through MAPK and NF-κB signaling pathways.

In this study, polysaccharides extracted from Hericium erinaceus were modified to obtain its nine selenium derivatives, sHEP1-sHEP9. Their structures were identified, yields and selenium contents were determined, the phenotypic and functional maturation of murine bone marrow-derived dendritic cells (DCs) and relevant mechanisms were compared taking unmodified HEP as control. The results revealed that the selenylation were successful. sHEP1, sHEP2 and sHEP8 treatment of DCs increased their surface expression of MHC-II and CD86 and indicated that sHEP1, sHEP2 and sHEP8 induced DC maturation. Furthermore, sHEP2 and sHEP8 also significantly decreased DCs endocytosis and significantly enhanced cytokine (IL-12 and IFN-γ) production. In line with TLR4 activation, sHEP2 increased the phosphorylation of ERK, p38, and JNK, and the nuclear translocation of p-c-Jun, p-CREB, and c-Fos. sHEP2 also activated NF-κB signaling, as evidenced by degradation of IκBα/ß and nuclear translocation of p65 and p50. Together, these results suggest that sHEP is a strong immunostimulant.