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Effects of lentinan on broiler splenocyte proliferation, interleukin-2 production, and signal transduction

Chen, H.L., Li, D.F., Chang, B.Y., Gong, L.M., Piao, X.S., Yi, G.F., Zhang, J.X.
Poultry science 2003 v.82 no.5 pp. 760-766
broiler chickens, beta-glucans, splenocytes, cell suspension culture, cell proliferation, interleukin-2, dose response, nitric oxide, calcium, metal ions, cyclic AMP, cyclic GMP, immunostimulants, receptors, immunology
Lentinan (LEN) is an intensively studied beta-glucan that has been shown to have immunostimulating and antitumor functions. However, it currently is not used in veterinary practice and animal production. This study was conducted to investigate the impacts of LEN on broiler splenocyte proliferation, interleukin-2 (IL-2) production, and to explore its effects on receptor signal transduction by determining signaling molecules, including nitric oxide (NO), cytosolic-free Ca(2+), cytosolic cyclic adenosine monophosphate (cAMP), and cyclic guanosine monophosphate (cGMP). The results showed that compared to the control all three measured doses, including 40, 80, and 160 microgram/mL LEN, increased splenocyte proliferation and IL-2 production (P < 0.05). Lentinan increased splenocyte NO production and cytosolic-free calcium concentration in a dose-dependent manner (P < 0.001). After incubating splenocytes for 20 min, LEN increased intracellular cAMP and cGMP concentrations at a dose of 80 and 160 microgram/mL, respectively. However, after incubating the splenocytes for 60 min, LEN had no effect on cytosolic cAMP and cGMP concentration irrespective of the LEN dosage. Those results indicated that LEN had immunostimulatory effects on splenocytes by increasing splenocyte proliferation and IL-2 production and by activating splenocyte receptor signal transduction.