The purpose of this study was to understand the epidemiological and biological character-istics of Clostridium perfringens in avian origin in Yangzhou.A total of 200 intestinal samples(90 from chickens and 110 from ducks)collected from different markets were isolated and identified by isolation and culture,morphological observation,staining microscopy,biochemical tests and other methods,antimicrobial susceptibility test by K-B paper method,and toxin type of isolated bacteria was detected by PCR.Five isolates were screened according to the characteristics of host origin,se-rotype and drug resistance,and multi-locus sequence typing analysis was carried out,and a phylo-genetic tree based on α toxin gene sequences was constructed for isolates from different sources.After morphological and molecular biological identification,a total of 61 strains of Clostridium perfringens were isolated,and the isolation rate was 30.5％,all of which were type A.The antimi-crobial susceptibility results showed that the isolate had the highest resistance rate to amikacin,followed by tetracycline and cotrimoxazole,and was more sensitive to ceftriaxone,penicillin,amoxicillin and imipenem.Multi-drug resistance is very serious,with six or more strains resistant to antibiotics emerging in every market.A total of five different ST types(STs)were found by multi-site sequence analysis,namely ST833,ST834,ST363,ST835,and ST837,and all of them were new ST types except ST363.The information from ST 363 is consistent with clinical isolate of Clostridium perfringens,suggesting that more attention needs to be paid to zoonotic diseases caused by Clostridium perfringens.The α toxin genes of the five isolates were located in four dif-ferent branches in the phylogenetic tree,indicating their genetic diversity,while the isolates from different provenances of the same source were located in the same branch,indicating that they had a closer evolutionary relationship.The Clostridium perfringens from poultry in Yangzhou are mainly type A,and with severe drug resistance and multi-drug resistance present.This research provides scientific evidence for the epidemiology and control of Clostridium perfringens.

The purpose of this study was to understand the epidemiological and biological character-istics of Clostridium perfringens in avian origin in Yangzhou.A total of 200 intestinal samples(90 from chickens and 110 from ducks)collected from different markets were isolated and identified by isolation and culture,morphological observation,staining microscopy,biochemical tests and other methods,antimicrobial susceptibility test by K-B paper method,and toxin type of isolated bacteria was detected by PCR.Five isolates were screened according to the characteristics of host origin,se-rotype and drug resistance,and multi-locus sequence typing analysis was carried out,and a phylo-genetic tree based on α toxin gene sequences was constructed for isolates from different sources.After morphological and molecular biological identification,a total of 61 strains of Clostridium perfringens were isolated,and the isolation rate was 30.5％,all of which were type A.The antimi-crobial susceptibility results showed that the isolate had the highest resistance rate to amikacin,followed by tetracycline and cotrimoxazole,and was more sensitive to ceftriaxone,penicillin,amoxicillin and imipenem.Multi-drug resistance is very serious,with six or more strains resistant to antibiotics emerging in every market.A total of five different ST types(STs)were found by multi-site sequence analysis,namely ST833,ST834,ST363,ST835,and ST837,and all of them were new ST types except ST363.The information from ST 363 is consistent with clinical isolate of Clostridium perfringens,suggesting that more attention needs to be paid to zoonotic diseases caused by Clostridium perfringens.The α toxin genes of the five isolates were located in four dif-ferent branches in the phylogenetic tree,indicating their genetic diversity,while the isolates from different provenances of the same source were located in the same branch,indicating that they had a closer evolutionary relationship.The Clostridium perfringens from poultry in Yangzhou are mainly type A,and with severe drug resistance and multi-drug resistance present.This research provides scientific evidence for the epidemiology and control of Clostridium perfringens.

Objective:To develop multiplex cytokine detection reagents to analyze expression levels of cytokines,angiogene-sis and bone remodeling proteins in relapse/refractory multiple myeloma(RRMM).Methods:Multiplex bead-based immunoassay by flow cytometry was used to develop quantitative detection reagents of multiplex cytokines,which were applied to detect serum samples from 55 RRMM patients and 22 healthy controls.Expression levels of cytokines,angiogenesis,and bone remodeling proteins in pa-tients,and their correlation with clinical characteristics were analyzed.Results:Detection reagents of 10-plex cytokine immunoassay were successfully developed in this study,with average sensitivity of 7.1 pg/ml,average recovery rate of 97.4%,average intra-assay CV of 4.8%,and average inter-assay CV of 9.0%.In addition,results of RRMM samples found that levels of IL-2,IL-17,DKK1,RANKL and OPG were positively correlated with the level of IgG monoclonal protein,and TIMP1 was positively correlated with levels of IgG and IgA monoclonal protein.Conclusion:In this study,ten kinds of cytokine detection reagents with high sensitivity and speci-ficity are developed,and we found that IL-2,IL-17,DKK1,RANKL,OPG and TIMP1 have potential value in tracking disease pro-gression in RRMM.The established development process of multiplex cytokine reagents has important reference significance for ex-panding the development and application of multiplex detection reagents for protein markers in the future.

Interleukin-33 (IL-33) is a new member of the IL-1 cytokine family which plays roles in the nucleus as a nuclear factor and is released by damaged or necrotic cells to act as a cytokine. It can be released via damaged or necrotic cells and functions as a cytokine. The released IL-33 activates the downstream NF-κB and MAPKs signaling pathways through the isomers of the specific receptor ST2 and the interleukin-1 receptor accessory protein (IL-1RAcP), resulting in danger signals and the activated multiple immune responses. IL-33 is abnormally expressed in various tumors and involves in tumorigenesis, development, and metastasis. Moreover, IL-33 can play both pro-tumor and anti-tumor roles in the same type of tumor.
Cytokines ; Humans ; Interleukin-33/genetics* ; MAP Kinase Signaling System ; NF-kappa B/metabolism* ; Neoplasms