Lymphatic regulation of hematocrit during hypoxia in the toad Bufo woodhousei.
Lymphatic regulation of hematocrit during hypoxia in the toad Bufo woodhousei.
复制标题
蟾蜍缺氧期间血细胞比容的淋巴调节。
DOI：
10.1152/ajpregu.1995.269.4.r814
复制
发表时间：
1995
期刊：
影响因子：
--
通讯作者：
Duran,M
中科院分区：
文献类型：
--
作者：
Malvin,GM;Macías,S;Sanchez,M;Dasalla,R;Park,A;Duran,M
Hypoxia rapidly increases hematocrit (Hct) in anuran amphibians by reducing plasma volume, but the mechanism(s) mediating this response is unknown. We tested the hypothesis that, during hypoxia, plasma volume is reduced by impaired lymph heart (LH) function, decreasing lymph flow into the circulation. In Bufo woodhousei, we measured the effects of hypoxia on Hct, lymph heart rate (LHR), LH pressure, the movement of dye from the dorsal lymph sac to the arterial blood, and flow through an open LH cannula. We also tested whether splenic contraction or cholinergic nerves contribute to the hypoxia-induced changes. Graded hypoxia between 21 and 4% O2 produced graded increases in Hct (P < 0.0001) and decreases in LHR (P = 0.01). Hypoxia reduced the rate of increase in arterial Evans blue concentration after injection into the dorsal lymph sac (P = 0.041) and decreased flow through an open LH cannula (P < 0.012). Hypoxia increased Hct and reduced LHR similarly in control, splenectomized, and sham-splenectomized toads. Atropine had no significant effect on Hct and LHR. These results indicate that the LHs play a regulatory role in hypoxia-induced hemoconcentration.
