To investigate the effects of calcitonin (CT) on cell proliferation, NaPi-IIb expression, and the absorption of phosphorus in porcine intestinal epithelial cells (IPEC-1). The experiment consisted of 1 control treatment and 5 levels of CT treatments (1×10-12 to 1×10-8 mol/L), and each treatment has 6 replications. Cell proliferation was determined by the MTT method. Cell morphology and phosphorus concentration in the cell supernatant were measured after 24 h of CT treatment. The NaPi-IIb protein expression was determined by Western Blot, and ...