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Zebrafish biosensor for toxicant induced muscle hyperactivity.

Maryam Shahid1,2, Masanari Takamiya1, Johannes Stegmaier3

  • 1Institute of Toxicology and Genetics, Karlsruhe Institute of Technology (KIT), Postfach 3640, D76021 Karlsruhe.

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Summary

A new transgenic zebrafish line, TgBAC(hspb11:GFP), offers sensitive detection of chemicals affecting motor function. This biosensor shows dose-dependent responses and muscle hyperactivity, aiding chemical risk management.

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Area of Science:

  • Toxicology
  • Genetics
  • Neuroscience

Background:

  • Chemical risk management requires sensitive detection systems for diverse and increasing chemical production.
  • Existing methods for assessing toxicant effects on motor function may lack quantitative readouts.
  • Developing in vivo biosensors is crucial for understanding chemical impacts on biological systems.

Purpose of the Study:

  • To establish a transgenic zebrafish biosensor for quantitative detection of chemical toxicants affecting motor function.
  • To characterize the expression pattern of the hspb11:GFP transgene in zebrafish.
  • To validate the biosensor's response to known motor-disrupting chemicals.

Main Methods:

  • Generation of a transgenic zebrafish line (TgBAC(hspb11:GFP)) with GFP reporter under hspb11 regulatory elements.
  • Analysis of spatiotemporal transgene expression in musculature and notochord.
  • Exposure of zebrafish embryos to chemicals and assessment of GFP intensity, muscle hyperactivity, and calcium signaling.
  • Evaluation of anesthetic (MS-222) effects on transgene expression.

Main Results:

  • TgBAC(hspb11:GFP) expression accurately mirrored endogenous hspb11 patterns.
  • Chemical exposure induced a dose-dependent increase in GFP intensity at sub-micromolar concentrations.
  • Toxicants triggered muscle hyperactivity, evidenced by increased calcium spike height and frequency.
  • MS-222 anesthesia abolished chemical and heat shock-induced transgene up-regulation.

Conclusions:

  • The TgBAC(hspb11:GFP) zebrafish line serves as a robust whole-organism biosensor for chemicals impacting motor function.
  • This system provides a quantitative measure of muscle hyperactivity.
  • The findings support the utility of this biosensor for chemical risk assessment and management.