In vivo microscopic observations of splenic tissue transplanted into modified Algire back chambers in mice revealed increased vascularity of the transplant following injections of various doses of erythropoietin. Concomitant histologic and peripheral blood studies suggested that this was vasoproliferation that occurred independent of the process of erythropoiesis.
While it has been suggested that orally transmitted erythropoietin can stimulate erythropoiesis, in vitro studies have shown that this glycoprotein is inactivated by incubation with various proteolytic enzymes. This study, utilizing the incorporation of 59Fe in the plethoric mouse, suggests that orally administered erythropoietin is ineffective in stimulating erythropoiesis.
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