Combined use of malachite green fixation and PLA2-gold complex technique to localize phospholipids in areas of early calcification of rat epiphyseal cartilage and bone

G. Silvestrini, N. Zini, P. Sabatelli, P. Mocetti, N. M. Maraldi, Ermanno Bonucci

Research output: Contribution to journalArticlepeer-review

Abstract

Two cytochemical methods (malachite green fixation and PLA2-gold complex technique) were combined in order to detect the presence and ultrastructural distribution of phospholipids in epiphyseal cartilage and metaphyseal bone of 25-day-old rats. Chondrocytes and osteoblasts showed a more intense PLA2-gold complex labeling of rough endoplasmic reticulum than mitochondria and plasma membranes. Roundish osmiophilic, electron-dense, lightly labeled structures were visible at the periphery of the cells. In areas of early mineralization of cartilage, not all the matrix vesicles were labeled by PLA2-gold complex. Calcification nodules showed intense labeling in comparison with the surrounding, lightly labeled uncalcified matrix; gold particles were chiefly found at their periphery. Calcification nodules of metaphyseal bone were deeply electron-dense after glutaraldehyde-malachite green fixation; PLA2-gold labeling was mainly found in connection with crystals, whereas the uncalcified matrix was weakly labeled. Calcified bone matrix showed a heavy labeling with randomly scattered gold particles. When pre-embedding decalcification was carried out in the presence of malachite green, a good preservation of organic component was obtained. The PLA2-gold positivity of decalcified areas of cartilage and bone confirmed the presence of phospholipids in mineralized matrix.

Original languageEnglish
Pages (from-to)559-565
Number of pages7
JournalBone
Volume18
Issue number6
DOIs
Publication statusPublished - Jun 1996

Keywords

  • Calcification
  • Malachite green
  • Phospholipase A (PLA)
  • Phospholipids
  • PLA-gold complex

ASJC Scopus subject areas

  • Physiology
  • Hematology

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