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Effect of tunicamycin on thyroglobulin secretion
European Journal of Biochemistry
|July 1, 1982
Summary
Tunicamycin significantly reduces thyroglobulin secretion from thyroid follicles by inhibiting its transport. This effect is not due to a general decrease in protein synthesis, indicating a specific impact on secretion pathways.
Area of Science:
- Endocrinology
- Molecular Biology
- Cell Biology
Background:
- Thyroglobulin is a key protein in thyroid hormone synthesis and secretion.
- Understanding the regulation of thyroglobulin secretion is crucial for thyroid function research.
Purpose of the Study:
- To investigate the effect of tunicamycin on thyroglobulin secretion from thyroid follicles.
- To determine if tunicamycin inhibits protein synthesis or specifically affects thyroglobulin secretion.
Main Methods:
- Incubation of pig thyroid follicles with tunicamycin.
- Measurement of [14C]leucine and [3H]mannose incorporation.
- Electron microscopic autoradiography of rat thyroid lobes.
Main Results:
- Tunicamycin (1-5 µg/ml) reduced thyroglobulin secretion by 60-95%.
- Tunicamycin inhibited [3H]mannose incorporation by 70-80% but not [14C]leucine incorporation.
- Autoradiography showed tunicamycin retained labeled thyroglobulin within follicle cells, preventing lumenal secretion.
Conclusions:
- Tunicamycin specifically suppresses thyroglobulin secretion.
- The mechanism of suppression is not related to inhibited overall protein synthesis.
- Tunicamycin interferes with the post-translational modification or transport of thyroglobulin.