Summary
From a crude streptomyces griseus “animal protein factor” feed supplement in which a corticotropin had been found, an acid eluate of charcoal adsorbate was prepared. In 2 milligram oral daily doses this eluate not only reversed the myeloplastic and cholinergic effects of aminopterin poisoning in weanling rats, but evoked accelerated growth and hemopoiesis in the face of aminopterin administration. It is concluded that the original fermentation broth contained an erythropoietin and a somatotropin in addition to the corticotropin.
Since intestinal commensal organisms including those classified among the enterobacteriacae have been shown to be a source of corticotropin, it is postulated that microbial sources, including the intestinal flora can engender somatotropic and erythropoietic factors similar to those, or precursors to those produced by the adenohypophysis. It is further postulated that pituitary erythropoietin precursor arises from the intestinal flora, is a transient constituent of intestinal mucosa and liver and reaches the anterior pituitary where it is modified to its final elaborate; erythropoietic hormone, EPH.
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Barnard, R.D., Freeman, M.D. Aminopterin toxicity reversal by a hemopoietic fraction of microbial “animal protein factor”: Some similarities of streptomyces fermentation residue to pituitary erythropoietin. Amer. Jour. Dig. Dis. 22, 76–82 (1955). https://doi.org/10.1007/BF02886454
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DOI: https://doi.org/10.1007/BF02886454