Histochemical and autoradiographic studies on elcatonin internalization and intracellular movement in osteoclasts

Mika Ikegame, Sadakazu Ejiri, Hidehiro Ozawa

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Abstract

The binding sites and chronologic localization of elcatonin (eCT) in osteoclasts were examined by autoradiography using [125I]elcatonin (125I-eCT). In addition to the structural changes induced by calcitonin (CT) reported so far, changes were also observed in the structure of Golgi apparatus. These changes continued until 48-72 h after incubation with eCT. Developed silver grains of 125I-eCT were localized into multinucleated osteoclasts and mononuclear cells that were ultrastructurally defined as "preosteoclasts." The silver grains located on plasma membranes of those cells and were then internalized; they accumulated, especially in the Golgi apparatus, and remained for 48-72 h. A few silver grains were also detected in lysosomes and small vesicles. The decrease in the number of silver grains in the Golgi apparatus accompanied the recovery of osteoclast structures - Golgi apparatus and then ruffled borders. These findings suggest that (1) CT especially inhibits the sorting function of Golgi apparatus in osteoclasts, resulting in prolonged retention of CT in this organelle. (2) The CT in Golgi apparatus may keep its activity and cause the prolonged effect of CT on osteoclast activity.

Original languageEnglish
Pages (from-to)25-37
Number of pages13
JournalJournal of Bone and Mineral Research
Volume9
Issue number1
Publication statusPublished - Jan 1994
Externally publishedYes

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Golgi Apparatus
Osteoclasts
Calcitonin
Silver
Lysosomes
Autoradiography
Organelles
elcatonin
Binding Sites
Cell Membrane

ASJC Scopus subject areas

  • Surgery

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Histochemical and autoradiographic studies on elcatonin internalization and intracellular movement in osteoclasts. / Ikegame, Mika; Ejiri, Sadakazu; Ozawa, Hidehiro.

In: Journal of Bone and Mineral Research, Vol. 9, No. 1, 01.1994, p. 25-37.

Research output: Contribution to journalArticle

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