Influence of colchicine and vinblastine on the intracellular migration of secretory and membrane glycoproteins: II. Inhibition of secretion of thyroglobulin in rat thyroid follicular cells as visualized by radioautography after 3H-fucose injection
Young (40 gm) rats were given a single intravenous injection of colchicine (4.0 mg) or vinblastine (2.0 mg). At 10 min after colchicine and 30 min after vinblastine administration, the rats were injected with 3H-fucose. Control rats received 3H-fucose only. All rats were sacrificed 90 min after 3H-fucose injection and their tissues processed for radioautography. In thyroid follicular cells of control animals, at this time interval, 57% of the total label was associated with colloid and secretory vesicles in the apical cytoplasm while 27% was localized in the Golgi apparatus and neighboring vesicles. In experimental animals, the proportion of label in colloid and apical vesicles was reduced by more than 69% after colchicine and more than 83% after vinblastine treatment. The proportion of label in the Golgi region, on the other hand, increased by more than 125% after colchicine and more than 179% after vinblastine treatment. Within the Golgi region, the great majority of the label was associated with secretory vesicles which accumulated adjacent to the trans face of the Golgi stacks. It is concluded that the drugs do not interfere with passage of newly synthesized thyroglobulin from the Golgi saccules to nearby secretory vesicles, but do inhibit intracellular migration of these vesicles to the cell apex. In most cells the number of vesicles in the apical cytoplasm diminished, but this was not always the case, suggesting that exocytosis may also be partially inhibited. The loss of microtubules in drug-treated cells suggests that the microtubules may be necessary for intracellular transport of thyroglobulin.
- Research Organization:
- McGill Univ., Montreal, Quebec, Canada
- OSTI ID:
- 6240522
- Journal Information:
- Am. J. Anat.; (United States), Vol. 170:4
- Country of Publication:
- United States
- Language:
- English
Similar Records
Influence of colchicine and vinblastine on the intracellular migration of secretory and membrane glycoproteins: I. Inhibition of glycoprotein migration in various rat cell types as shown by light microscope radioautography after injection of 3H-fucose
Effect of colchicine on rat small intestinal absorptive cells. II. Distribution of label after incorporation of (/sup 3/H)fucose into plasma membrane glycoproteins
Related Subjects
THYROID
AUTORADIOGRAPHY
BIOLOGICAL EFFECTS
COLCHICINE
GLUCOPROTEINS
HEXOSES
INHIBITION
RATS
SECRETION
THYROGLOBULIN
TRITIUM COMPOUNDS
VINBLASTINE
ALKALOIDS
ANIMALS
ANTIMITOTIC DRUGS
ANTIPYRETICS
AROMATICS
AZAARENES
AZOLES
BODY
CARBOHYDRATES
CENTRAL NERVOUS SYSTEM DEPRESSANTS
DRUGS
ENDOCRINE GLANDS
GLANDS
GLOBULINS
HETEROCYCLIC COMPOUNDS
INDOLES
LABELLED COMPOUNDS
MAMMALS
MONOSACCHARIDES
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANS
PROTEINS
PYRROLES
RODENTS
SACCHARIDES
VERTEBRATES
551001* - Physiological Systems- Tracer Techniques
550301 - Cytology- Tracer Techniques