The potential role of polyamines in gill epithelial remodeling during extreme hypoosmotic challenges in the Gulf killifish, Fundulus grandis

Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology
Ying GuanFernando Galvez

Abstract

Polyamines are a family of low molecular weight organic cations produced in part by the coordinated actions of arginase II (Arg II) and ornithine decarboxylase (Odc). Although gill polyamine homeostasis is affected by acute transfer to fresh water, little is known of its function in fish osmoregulation. The current study investigated the role of polyamines in the compensatory response of hypoosmotic challenge in the euryhaline fish, Fundulus grandis. Adult F. grandis were acclimated to 5 ppt water, transferred abruptly to 5, 2, 1, 0.5 and 0.1 ppt water, and assessed for osmoregulatory function, gill morphology, and polyamine homeostasis. The plasma osmolality, Na(+) concentration, and Cl(-) concentration were only significantly reduced during exposure to salinities at or below 0.5 ppt, although these effects were transient except in the 0.1 ppt treatment. The phenotype of mitochondrion-rich cells (MRCs) shifted from a seawater-type to a freshwater-type only at salinities that also produced a plasma osmotic disturbance. Hypoosmotic exposure increased the concentrations of putrescine, spermidine, and spermine in the gill over the entire 7 day period. Exposure to 0.1 ppt water also transiently increased gill caspase-3 activity and...Continue Reading

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Citations

Feb 13, 2020·Journal of Experimental Zoology. Part A, Ecological and Integrative Physiology·Tyler G Evans, Dietmar Kültz
Feb 17, 2017·Marine Biotechnology·Jianbo YuanJianhai Xiang
Mar 25, 2019·Comparative Biochemistry and Physiology. Toxicology & Pharmacology : CBP·Charles BrownFernando Galvez
Apr 30, 2021·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Kathleen M MunleyFernando Galvez
Jul 7, 2018·Environmental Science & Technology·Thomas H HamptonJoseph R Shaw

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