...Daniel Brönnimann; Tiziana Annese; Thomas A. Gorr; Valentin Djonov ABSTRACT Nucleated circulating red blood cells (RBCs) of developing zebrafish, chick and mouse embryos can actively proliferate. While marrow- or organ-mediated erythropoiesis has been widely studied, transforming in vivo processes...

...Shun Maekawa; Hitomi Iemura; Takashi Kato SUMMARY Hematopoietic responses to environmental factors are not fully characterized. Polycythemia has been reported during exposure to low temperatures in ectothermic animals. The relationship between the causes of polycythemia and erythropoiesis during...

...Shun Maekawa; Hitomi Iemura; Yuko Kuramochi; Nami Nogawa-Kosaka; Hironori Nishikawa; Takehito Okui; Youichi Aizawa; Takashi Kato SUMMARY Diminished erythrocyte count and erythropoiesis have been reported during hypothermia in some ectothermic animals. In this study, the African clawed frog, Xenopus...

... for transporting oxygen to tissues. The regulation of erythropoiesis in vertebrates other than mammals is yet to be elucidated. Recently we identified erythropoietin, a primary regulator of erythropoiesis, in Xenopus laevis , which should enable us to identify target cells, including erythroid progenitors...

... reproductive anemia associated with egg production(hemodilution, transient suppression of erythropoiesis, resource dependence)in relation to (1) the time-course of development and recovery from anemia,(2) changes in specific hematological traits, and (3) the effect of diet quality, in female zebra finches...

...@cw.bc.ca ) 2 12 2007 © The Company of Biologists Limited 2008 2008 hematocrit cost of reproduction egg production erythropoiesis estrogen zebra finch The `cost of reproduction', a central and long-standing component of life history theory, contends that the benefits...

... systems are similar in response to hypoxia, in that erythropoiesis in fish is influenced by EPO. Fig. 1. Erythropoietin (EPO) levels measured ( via ELISA) for (A) rainbow trout kidney and (B) spleen during exposure of the fish to substantial hypoxia. Values are mean ±s.d., N =6. * Significantly...

.... Another explanation for this observation would be that hypoxia stimulates erythropoiesis in zebrafish larvae, as it does in fetal mammals( Richardson and Bocking, 1998 )or in embryos of the turtle Pseudemys nelsoni ( Kam, 1993 ; Jacob et al., 2002 ). Recent molecular studies revealed that hematopoiesis...

... reduction in oxygen-carrying capacity. The effect is clearly temperature-dependent, since making the fish anaemic did not induce erythropoiesis within 30 days in trout acclimated to 1 °C (results not shown). Fig. 2. The erythrocyte number in control fish (filled circles; N =5) and in anaemic fish...