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Thermal tolerance of Antarctic notothenioid fishes correlates with level of circulating hemoglobin.
Physiol Biochem Zool
October 2011
School of Marine Sciences, University of Maine, Orono, Maine 04469, USA.
The West Antarctic Peninsula region is experiencing some of the most rapid elevations in temperature of any marine environment. We assessed thermal tolerance of white- and red-blooded Antarctic notothenioid fishes inhabiting these waters, using a modified critical thermal maximum (CT(max)) design. Temperature was elevated acutely from ambient at a constant rate of 3.
View Article and Find Full Text PDFPhenylhydrazine-induced anemia causes nitric-oxide-mediated upregulation of the angiogenic pathway in Notothenia coriiceps.
J Exp Biol
August 2010
Department of Molecular and Biomedical Sciences, University of Maine Orono, ME 04469-5751, USA.
Antarctic icefishes possess several cardiovascular characteristics that enable them to deliver oxygen adequately in the absence of hemoglobin (Hb). To gain insight into mechanisms driving development of these cardiovascular characteristics of icefish, we chemically induced severe anemia in a red-blooded notothenioid, Notothenia coriiceps. After 10 days of treatment with phenylhydrazine HCl, the hematocrit and Hb concentration of N.
View Article and Find Full Text PDFRelationship among circulating hemoglobin, nitric oxide synthase activities and angiogenic poise in red- and white-blooded Antarctic notothenioid fishes.
Comp Biochem Physiol A Mol Integr Physiol
August 2010
School of Marine Sciences, University of Maine, 5751 Murray Hall, Orono, Maine 04469-5751, USA.
Nitric oxide (NO)-mediated angiogenesis may play a role in establishing dense retinal vasculatures of Antarctic hemoglobinless icefishes (suborder: Notothenioidei). We hypothesized that loss of hemoglobin (Hb) leads to elevation in [NO] due to decreased degradation of the compound when the NO-scavenger Hb is absent, thereby inducing vascular growth. We found that total mass of NO metabolites, nitrite plus nitrate (NO(x)), in plasma is greater in icefishes than in red-blooded notothenioids [e.
View Article and Find Full Text PDFMorphological and physiological study of the cardiac NOS/NO system in the Antarctic (Hb-/Mb-) icefish Chaenocephalus aceratus and in the red-blooded Trematomus bernacchii.
Nitric Oxide
March 2009
Department of Cellular Biology, University of Calabria, 87030 Arcavacata di Rende, CS, Italy.
The nitric oxide synthase (NOS)/nitric oxide (NO) system integrates cellular biochemical machinery and energetics. In heart microenvironment, dynamic NO behaviour depends upon the presence of superoxide anions, haemoglobin (Hb), and myoglobin (Mb), being hemoproteins are major players disarming NO bioactivity. The Antarctic icefish, which lack Hb and, in some species, also cardiac Mb, represent a unique model for exploring Hb and Mb impact on NOS/NO function.
View Article and Find Full Text PDFMorphometry of retinal vasculature in Antarctic fishes is dependent upon the level of hemoglobin in circulation.
J Exp Biol
March 2007
School of Marine Sciences, University of Maine, 5751 Murray Hall, Orono, ME 04469-5751, USA.
We quantitatively assessed ocular vascular patterns of six Antarctic notothenioid fishes that vary in their expression of the circulating oxygen-binding protein, hemoglobin (Hb). Digital image analyses revealed marked differences in vessel morphometries among notothenioid species. Hemoglobinless (-Hb) icefishes display mean vessel length densities that are greater (Chaenocephalus aceratus, 5.
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