The Effects of Zinc on Proprioceptive Sensory Function and Nerve Conduction
Author:
Elliott Elizabeth R.1ORCID, Brock Kaitlyn E.1, Taul Alaina C.1ORCID, Asadipooya Artin1, Bocook Devin1, Burnette Tessa1, Chauhan Isha V.1, Chhadh Bilal1, Crane Ryan1, Glover Ashley1, Griffith Joshua1ORCID, Hudson JayLa A.1, Kashif Hassan1, Nwadialo Samuel O.1, Neely Devan M.1, Nukic Adel1, Patel Deep R.1, Ruschman Gretchen L.1, Sales Johnathan C.1, Yarbrough Terra1, Cooper Robin L.1ORCID
Affiliation:
1. Department of Biology, University of Kentucky, Lexington, KY 40506-0225, USA
Abstract
Zinc (Zn2+) is an essential element that can promote proper organ function, cell growth, and immune response; it can also, however, be present in too great a quantity. Zinc toxicity caused by overexposure may result in both minor and major physiological effects, with chronic exposure at low levels and acute exposure at high levels being harmful or even toxic. This investigation examines the effects of acute exposure to relatively high concentrations of Zn2+ on sensory nerve function and nerve conduction. A proprioceptive nerve in marine crab (Callinectes sapidus) limbs was used as a model to assess the effects of Zn2+ on stretch-activated channels (SACs) and evoked nerve conduction. Exposure to Zn2+ slowed nerve condition rapidly; however, several minutes were required before the SACs in sensory endings were affected. A depression in conduction speed and an increase followed by a decrease in amplitude were observed for the evoked compound action potential, while the frequency of nerve activity upon joint movement and stretching of the chordotonal organ significantly decreased. These altered responses could be partially reversed via extensive flushing with fresh saline to remove the zinc. This indicates that subtle, long-term exposure to Zn2+ may alter an organism’s SAC function for channels related to proprioception and nerve conduction.
Funder
Beckman Scholarship College of Arts and Sciences Summer Research Fellowship Gertrude Flora Ribble Scholarship from the Department of Biology at the University of Kentucky Use of classroom teaching equipment by Department of Biology, University of Kentucky Personal funds
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