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Are MUPs a Toxic Waste Disposal System?

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Major urinary proteins (MUPs) in male mice bind toxic industrial chemicals like 2,4-di-tert-butylphenol (DTBP), potentially displacing pheromones. This suggests MUPs may prioritize waste excretion over pheromone transport.

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Area of Science:

  • Animal behavior
  • Biochemistry
  • Environmental toxicology

Background:

  • Major urinary proteins (MUPs) in male mice bind pheromones and may excrete toxins.
  • The 'toxic waste hypothesis' proposes MUPs bind and eliminate harmful compounds.

Purpose of the Study:

  • To investigate the binding of the industrial chemical 2,4-di-tert-butylphenol (DTBP) by MUPs in mouse urine.
  • To determine if MUPs bind DTBP and if this binding impacts pheromone transport.

Main Methods:

  • Detected DTBP in wild-derived house mouse urine.
  • Used guanidine hydrochloride to denature MUPs and release bound compounds from high molecular weight fractions (HMWF).
  • Assessed DTBP's effect on the release of the male-specific pheromone 2-sec-butyl-4,5-dihydrothiazole (SBT) from MUPs.

Main Results:

  • DTBP was detected in mouse urine and released from HMWF upon MUP denaturation.
  • DTBP binding to MUPs displaced SBT, indicating competitive ligand binding.
  • Evidence suggests DTBP is a MUP ligand.

Conclusions:

  • MUPs bind the industrial chemical DTBP, supporting the 'toxic waste hypothesis'.
  • Competitive binding between DTBP and SBT suggests a tradeoff between toxin elimination and pheromone transport in male mice.
  • MUPs may primarily function in excreting toxic waste, offering significant fitness benefits.