Abstract
After cold storage treatment (5-7 days at 2 degrees C) the sensitivity to norepinephrine (NE) was increased in rabbit portal vein, decreased in rat portal vein and not altered in guinea pig portal vein. Cold storage decreased the sensitivity to methoxamine (ME), Ba++ and Ca++ in rat and guinea pig veins but not in rabbit veins and failed to alter the sensitivity to K+ in all veins tested. Cold storage increased 45Ca-influx while it reduced the NE content and 3H-NE uptake of all portal veins examined. NE and ME-induced 45Ca-influx was greater in cold-stored veins that in fresh veins from rabbit and guinea pig. K+ decreased 45Ca-influx in all cold-stored veins. These results indicate that cold storage induces a prejunctional supersensitivity in rabbit portal vein but not in guinea pig and rat portal veins. However, cold storage increased 45Ca-influx in all three veins.
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