Biosensing of opioids using frog melanophores

Area of Science:

• Cell Biology
• Biotechnology
• Neuroscience

Background:

• Lower vertebrates exhibit color changes due to specialized pigment cells called chromatophores.
• Melanophores, a type of chromatophore containing melanin, show pigment aggregation or dispersion, which can be optically measured.
• Functional expression of G protein-coupled receptors in cultured melanophores offers potential for biosensing applications.

Purpose of the Study:

• To develop a novel biosensor for opioid detection using recombinant frog melanophores.
• To investigate the utility of engineered melanophores expressing human opioid receptors for substance detection.

Main Methods:

• Frog melanophores were transfected with the human opioid receptor 3.
• Opioid detection was performed using an aggregation assay analyzing absorbance changes.
• Receptor pharmacology was assessed via competitive inhibition studies with naloxone.

Main Results:

• Transfected melanophores exhibited pigment aggregation in response to opioid receptor agonists like morphine.
• The engineered melanophore biosensor demonstrated selective detection of opioids.
• The expressed receptor pharmacology closely mirrored its mammalian counterpart.

Conclusions:

• Recombinant frog melanophores can be effectively utilized as a biosensor for detecting opioids.
• This melanophore biosensor technology has potential for measuring various substances in body fluids.
• Engineered melanophores offer a versatile platform for developing selective biosensors.