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Studies with the serine hydrolase inhibitor JZL184 have suggested that enhanced 2-arachidonoylglycerol signaling could be strategized to stimulate innate immune cells to combat invading pathogens and improve host defense by prompting the systemic release of proinflammatory cytokines. Although the neurochemical effects of JZL184 were found to cultivate within 30 min in mice, its immune-regulating effects have been studied much later and its effects on chickens have not been clear. To explore the modulations in the chickens’ immune responses, we studied the effects of intraperitoneal injections of JZL184 in APEC O78-infected chickens on pathogenicity, histopathology, and IL-1β levels. The pathogenicity of the strain was assessed by isolating bacteria from livers, blood, air sacs, and hearts at 8, 28, and 56 h post-infection (p.i.). Air sacs, livers, and hearts were examined for histopathological changes at 8, 28, and 56 h p.i. Serum samples were collected at 8, 28, and 56 h p.i. and analyzed with a chicken IL-1β ELISA kit. Liver and spleen samples were homogenized for detection of serine hydrolases and carboxylesterases. Our work showed that 10 mg/kg and 40 mg/kg of JZL184 did not reduce the severity and progression of lesions produced in chickens challenged with 108 CFU of E. coli O78. The JZL184 treatments made colibacillosis lesions in the E. coli O78-challenged chickens worse and we did not find evidence of the injections increasing the serum cytokine levels of IL-1β at our sampling times. |
