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Rapid and transient reorganization of the cytoskeleton in GH3B6 cells during short-term exposure to thyroliberin

S van de Moortele1, E Rosenbaum, A Tixier-Vidal

  • 1Groupe de Neuroendocrinologie Cellulaire et Moleculaire, URA CNRS 1115, College de France, Paris.

Journal of Cell Science
|May 1, 1991
PubMed

Insights

Thyrotropin-releasing hormone (TRH) transiently alters cytoskeletal organization in GH3B6 cells, paralleling prolactin (PRL) release and intracellular granule redistribution. These dynamic cytoskeletal changes correlate with PRL release phases.

Area of Science:

  • Cell Biology
  • Endocrinology
  • Biochemistry

Background:

  • The GH3B6 rat pituitary tumor cell line is a model for studying prolactin (PRL) secretion.
  • Thyrotropin-releasing hormone (TRH) is a key regulator of PRL release.
  • Cytoskeletal dynamics play crucial roles in cellular processes, including hormone secretion.

Purpose of the Study:

  • To investigate the dynamic changes in the cytoskeleton of GH3B6 cells upon TRH stimulation.
  • To correlate cytoskeletal reorganization with PRL release and intracellular PRL granule dynamics.

Main Methods:

  • Immunofluorescence microscopy was used to visualize cytoskeletal elements (microtubules, cytokeratin, F-actin) and PRL-containing granules.
  • GH3B6 cells were analyzed under basal conditions and after short-term stimulation with TRH (0-30 minutes).

Main Results:

  • Basal conditions revealed dense microtubule networks, perinuclear cytokeratin cages, and diffuse F-actin.
  • TRH stimulation induced transient cytoskeletal changes: early tubulin blebs, followed by actin network reorganization, and later expansion of microtubule and cytokeratin networks.
  • These cytoskeletal modifications occurred in parallel with PRL release phases and intracellular PRL granule redistribution.

Conclusions:

  • TRH induces rapid and transient cytoskeletal reorganization in GH3B6 cells.
  • A parallelism exists between the redistribution of intracellular PRL compartments and cytoskeletal element reorganization during TRH exposure.
  • The precise transduction mechanisms linking TRH action to these cytoskeletal modifications require further investigation.

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