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Related Experiment Videos

Thyrotropin modulates low density lipoprotein binding activity in FRTL-5 thyroid cells.

M Bifulco1, M Santillo, I Tedesco

  • 1Centro di Endocrinologia ed Oncologia Sperimentale/Consiglio Nazionale delle Ricerche, University of Naples, Italy.

The Journal of Biological Chemistry
|November 5, 1990
PubMed
Summary

Thyrotropin (TSH) regulates low-density lipoprotein (LDL) receptor activity in FRTL-5 cells. TSH reduces LDL binding by decreasing receptor number, a process dependent on protein synthesis and potentially linked to cell proliferation needs.

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Area of Science:

  • Cell Biology
  • Endocrinology
  • Molecular Biology

Background:

  • FRTL-5 cells express high-affinity low-density lipoprotein (LDL) receptors.
  • Thyrotropin (TSH) influences cellular processes in FRTL-5 cells.

Purpose of the Study:

  • To investigate the effect of TSH on LDL receptor activity in FRTL-5 cells.
  • To elucidate the mechanism of TSH-mediated regulation of LDL binding.

Main Methods:

  • Measurement of LDL binding to FRTL-5 cells under varying TSH concentrations.
  • Assessment of LDL receptor activity using 8-Br-cAMP and protein synthesis inhibitors (cycloheximide, actinomycin D).
  • Analysis of TSH regulation in v-ras Ki-transformed FRTL-5 cells.

Main Results:

Related Experiment Videos

  • TSH deprivation increases LDL binding; TSH addition rapidly decreases it.
  • TSH down-regulates LDL receptor activity by reducing receptor number, not affinity.
  • The effect is mimicked by 8-Br-cAMP and inhibited by cycloheximide, suggesting a protein synthesis-dependent pathway.
  • TSH regulation is lost in v-ras Ki-transformed cells, but 8-Br-cAMP still affects LDL binding.

Conclusions:

  • TSH exerts a regulatory effect on LDL receptor activity in FRTL-5 cells.
  • This regulation involves a decrease in the number of active LDL receptors, mediated by a protein synthesis-dependent pathway.
  • Altered cholesterol uptake may support the metabolic demands of proliferating cells.