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Mechanisms of heavy-metal sequestration and detoxification in crustaceans: a review

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Abstract

This review is an update of information recently obtained about the physiological, cellular, and molecular mechanisms used by crustacean organ systems to regulate and detoxify environmental heavy metals. It uses the American lobster, Homarus americanus, and other decapod crustaceans as model organisms whose cellular detoxification processes may be widespread among both invertebrates and vertebrates alike. The focus of this review is the decapod hepatopancreas and its complement of metallothioneins, membrane metal transport proteins, and vacuolar sequestration mechanisms, although comparative remarks about potential detoxifying roles of gills, integument, and kidneys are included. Information is presented about the individual roles of hepatopancreatic mitochondria, lysosomes, and endoplasmic reticula in metal sequestration and detoxification. Current working models for the involvement of mitochondrial and endoplasmic reticulum calcium-transport proteins in metal removal from the cytoplasm and the inhibitory interactions between the metals and calcium are included. In addition, copper transport proteins and V-ATPases associated with lysosomal membranes are suggested as possible sequestration processes in these organelles. Together with several possible cytoplasmic divalent and trivalent anions such as sulfate, oxalate, or phosphate, accumulations of metals in lysosomes and their complexation into detoxifying precipitation granules may be regulated by variations in lysosomal pH brought about by bafilomycin-sensitive proton ATPases. Efflux processes for metal transport from hepatopancreatic epithelial cells to the hemolymph are described, as are the possible roles of hemocytes as metal sinks. While some of the cellular processes for isolating heavy metals from general circulation occur in the hepatopancreas and are beginning to be understood, very little is currently known about the roles of the gills, integument, and kidneys in metal regulation. Therefore, much remains to be clarified about the organs and mechanisms involved in metal homeostasis in decapod crustaceans.

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Abbreviations

ER :

endoplasmic reticulum

SERCA :

sarco/endoplasmic reticulum calcium ATPase

V-ATPase:

vacuolar ATPase

PMCA :

plasma membrane calcium ATPase

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Acknowledgements

Much of the work reported in this review on the American lobster, Homarus americanus, was supported by National Science Foundation grant IBN99-74569.

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  1. Department of Biology, University of North Florida, 4567 St. Johns Bluff Rd, South, Jacksonville, FL , 32223, USA

    G. A. Ahearn, P. K. Mandal & A. Mandal

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  1. G. A. Ahearn
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Correspondence to G. A. Ahearn.

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Communicated by I.D. Hume

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Ahearn, G.A., Mandal, P.K. & Mandal, A. Mechanisms of heavy-metal sequestration and detoxification in crustaceans: a review. J Comp Physiol B 174, 439–452 (2004). https://doi.org/10.1007/s00360-004-0438-0

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