Absence of fodrin (spectrin-like protein) under the pseudopod membrane in stimulated thyroid cells
Gabrion, J.B.; Barrière, H.; Nguyen Than Dao, B.; Chambard, M.; Mauchamp, J.; Regnouf, F.; Pradel, L.A.
European Journal of Cell Biology 52(2): 282-290
1990
ISSN/ISBN: 0171-9335 PMID: 2081530 Document Number: 351115
A fodrin-like protein purified from porcine thyroid cells and characterized by its properties identical to those of pig brain spectrin (F. Regnouf et al., Eur. J. Biochem. 153, 313-319 (1985)) has been localized by immunofluorescence and electron immunocytochemistry in porcine and rat thyroid. Fodrin-like polypeptides were detected in subplasmalemmal meshworks of microfilaments attached to isolated or in situ plasma membranes. In resting cells, fodrin was found under apical and basolateral membrane domains, whereas it was always absent under the pseudopod membrane domain induced by acute TSH stimulation in vitro, using monolayers of porcine cultured cells attached to collagen permeable substrates, as well as in vivo, using rats intravenously treated with TSH. Thyroid fodrin could be involved in exocytosis and membrane stabilization which occurs during the formation of pseudopods induced by TSH stimulation.