Anti-TNFRSF9 polyclonal antibody

Obesity-induced skeletal muscle inflammation is characterized by increased macrophage infiltration and inflammatory cytokine production. In this study, we investigated whether 4-1BB, a member of the TNF receptor superfamily (TNFRSF9) that provides inflammatory signals, participates in obesity-induced skeletal muscle inflammation. Expression of the 4-1BB gene, accompanied by increased levels of inflammatory cytokines, was markedly upregulated in the skeletal muscle of obese mice fed a high-fat diet, in muscle cells treated with obesity factors, and in cocultured muscle cells/macrophages. In vitro stimulation of 4-1BB with agonistic antibody increased inflammatory cytokine levels in TNF alpha-pretreated muscle cells, and this effect was absent in cells derived from 4-1BB-deficient mice. Conversely, disruption of the interaction between 4-1BB and its ligand (4-1BBL) with blocking antibody decreased the release of inflammatory cytokines from cocultured muscle cells/macrophages. Moreover, deficiency of 4-1BBmarkedly reduced macrophage infiltration and inflammatory cytokine production in the skeletal muscle of mice fed a high-fat diet. These findings indicate that 4-1BBmediates the inflammatory responses in obese skeletal muscle by interacting with its ligand 4-1BBL on macrophages. Therefore, 4-1BB and 4-1BBL may be useful targets for prevention of obesity-induced inflammation in skeletal muscle.

Six new 5-position modified dUTP derivatives connected by a unique amide linkage were synthesized and tested for compatibility with the enzymatic steps of in vitro selection. Six commercially available DNA polymerases were tested for their ability to efficiently incorporate each of these dUTP derivatives during PCR. It was not possible to perform PCR under standard conditions using any of the modified dUTP derivatives studied. In contrast, primer extension reactions of random templates, as well as defined sequence templates, were successful. KOD XL and D. Vent DNA polymerases were found to be the most efficient at synthesizing full-length primer extension product, with all of the dUTP derivatives tested giving yields similar to those obtained with UP. Several of these modified dUTPs were then used in an in vitro selection experiment comparing the use of modified dUTP derivatives with TTP for selecting aptamers to a protein target (necrosis factor receptor superfannily member 9, TNFRSF9) that had previously been found to be refractory to in vitro selection using DNA. Remarkably, selections employing modified DNA libraries resulted in the first successful isolation of DNA aptamers able to bind TNFRSF9 with high affinity.