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Iron‐saturated lactoferrin as a comitogenic substance for neonatal rat hepatocytes in primary culture

We studied the effect of lactoferrin on DNA synthesis in neonatal rat hepatocytes in primary culture to determine if this agent acts as a mitogen in human milk. Thymidine incorporation into the DNA of cultured hepatocytes stimulated by lactoferrin in the presence of insulin and human epidermal growth factor was examined. Iron‐saturated lactoferrin increased DNA synthesis of neonatal hepatocytes by 1.5 times and this potency was the same as that of insulin. It significantly enhanced the stimulatory effect of human epidermal growth factor plus insulin; DNA synthesis under these conditions was seven times that of control. Iron‐free lactoferrin did not affect DNA synthesis, nor did the exogenous addition of ferric ions. The enhancement of DNA synthesis by iron‐saturated lactoferrin was significant for neonatal hepatocytes, but not for adult hepatocytes. These results suggest that iron‐saturated lactoferrin, which itself had low mitogenic activity, is a co‐mitogenic substance for neonatal hepatocytes in vitro.