Bioassays for thyrotropin receptor autoantibodies

Area of Science:

• Endocrinology
• Immunology
• Clinical Diagnostics

Background:

• Bioassays were vital for discovering thyrotropin and understanding the pituitary-thyroid axis.
• Bioassays identified thyrotropin receptor autoantibodies (TSH-R-Ab) and their role in Graves' disease pathophysiology.
• Cell-based bioassays revealed TSH-R-Ab's dual function (stimulating/blocking) in various autoimmune thyroid diseases (AITD).

Purpose of the Study:

• To highlight the evolution of TSH-R-Ab bioassays from research tools to clinical diagnostics.
• To emphasize the clinical utility of functional TSH-R-Ab activity assessment.
• To introduce recent advancements in biosensor technology for rapid TSH-R-Ab bioassays.

Main Methods:

• Historical review of animal and cell-based bioassay development for TSH-R-Ab.
• Comparison of functional bioassays with competitive-binding immunoassays for TSH-R-Ab.
• Application of biosensor technology to create rapid and simple TSH-R-Ab bioassays.

Main Results:

• Bioassays differentiate stimulatory vs. blocking TSH-R-Ab activity, crucial for AITD management.
• Traditional immunoassays lack functional activity information.
• New biosensor-based bioassays are rapid, simple, and suitable for routine clinical use.

Conclusions:

• TSH-R-Ab bioassays have transitioned to essential clinical laboratory tests.
• Rapid and simple TSH-R-Ab bioassays will enable routine measurement in clinical laboratories.
• Functional assessment of TSH-R-Ab is key for informed AITD patient management.