Interferon α/β induces changes in the metabolism of polyenoic phospholipids and diacylglycerols in the livers of suckling mice

Suckling mice were injected daily from birth for 10 days with potent preparations of mouse interferon α/β. Interferon treatment resulted in a markedly lower concentration of polyunsaturated fatty acids (20∶4ω6 and 22∶6ω3) in the two principal liver phospholipids, phosphatidylcholine and phosphatidylethanolamine, than in livers of control-treated mice. This effect appeared to correlate with a low level of synthesis of polyunsaturated phospholipids in the livers of interferon-treated mice. Thus, in control mice, synthesis of species of polyunsaturated phospholipids increased markedly in the first 10 days of life, whereas in 10-day-old interferontreated mice, the level of synthesis of species of polyunsaturated phospholipids was comparable to that in newborn mice. In parallel, a marked increase in the diacylglycerol content without change of its renewal was observed in the livers of interferon-treated mice. We suggest that interferon treatment results in an inhibition of one of the processes that leads to activation of the enzymatic systems responsible for the synthesis of species of polyunsaturated phosphatidylcholine and phosphatidylethanolamine in the liver of suckling mice. It seems likely that these results are related to the inhibition of liver cell maturation and the marked cell necrosis that are observed in interferon-treated suckling mice.