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Abstract
Addition of serum to the culture medium of murine L cells increased both the cellular level of NGF mRNA and the secretion of mature factor. Stimulation of NGF production by the serum was dose-dependent and appeared mediated by some specific factor(s). After gel filtration chromatography of serum, most of the biological activity formed a major peak with an apparent MW of about 160kDa. This promoting factor was sensitive to heat at neutral pH, but resisted after heating at pH4. An activity inducing NGF synthesis, and displaying a comparable thermal sensitivity was also detected in Cohn fraction IV of human or bovine plasma.
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