Anti-TNF monoclonal antibody, clone NBc22 [Brilliant Violet 605]

Porcine circovirus type 2 (PCV2) and Streptococcus suis serotype 2 (SS2) clinical coinfection cases have been frequently detected. The respiratory epithelium plays a crucial role in host defense against a variety of inhaled pathogens. Reactive oxygen species (ROS) are involved in killing of bacteria and host immune response. The aim of this study is to assess whether PCV2 and SS2 coinfection in swine tracheal epithelial cells (STEC) affects ROS production and investigate the roles of ROS in bacterial survival and the inflammatory response. Compared to SS2 infection, PCV2/SS2 coinfection inhibited the activity of NADPH oxidase, resulting in lower ROS levels. Bacterial intracellular survival experiments showed that coinfection with PCV2 and SS2 enhanced SS2 survival in STEC. Pretreatment of STEC with N-acetylcysteine (NAC) also helps SS2 intracellular survival, indicating that PCV2/552 coinfection enhances the survival of SS2 in STEC through a decrease in ROS production. In addition, compared to SS2-infected STEC, PCV2/SS2 coinfection and pretreatment of STEC with NAC prior to S52 infection both downregulated the expression of the inflammatory cytokines interleukin-6 (IL-6), tumor necrosis factor-alpha (TNF-alpha), and IL-1 beta. Further research found that activation of p38/MAPK promoted the expression of inflammatory cytokines in SS2-infected STEC; however, PCV2/SS2 coinfection or NAC pretreatment of STEC inhibited p38 phosphorylation, suggesting that coinfection of STEC with PCV2 and SS2 weakens the inflammatory response to SS2 infection through reduced ROS production. Collectively, coinfection of STEC with PCV2 and SS2 enhances the intracellular survival of SS2 and weakens the inflammatory response through decreased ROS production, which might exacerbate SS2 infection in the host.

Estrogen hormones protect against colorectal cancer (CRC) and a preventative role of estrogen receptor beta (ER beta) on CRC has been supported using full knockout animals. However, it is unclear through which cells or organ ER beta mediates this effect. To investigate the functional role of intestinal ER beta during colitis-associated CRC we used intestine-specific ER beta knockout mice treated with azoxymethane and dextran sodium sulfate, followed by ex vivo organoid culture to corroborate intrinsic effects. We explored genome-wide impact on TNF alpha signaling using human CRC cell lines and chromatin immunoprecipitation assay to mechanistically characterize the regulation of ER beta. Increased tumor formation in males and tumor size in females was noted upon intestinespecific ER beta knockout, accompanied by enhanced local expression of TNFa, deregulation of key NF kappa B targets, and increased colon ulceration. Unexpectedly, we noted especially strong effects in males. We corroborated that intestinal ER beta protects against TNFa-induced damage intrinsically, and characterized an underlying genomewide signaling mechanism in CRC cell lines whereby ER beta binds to cis-regulatory chromatin areas of key NF kappa B regulators. Our results support a protective role of intestinal ER beta against colitis-associated CRC, proposing new therapeutic strategies.