Ultrastructural Cytochemistry of Complex Carbohydrates in Osteoblasts, Osteoid, and Bone Matrix
Overview
Authors
Affiliations
Glycosaminoglycans (GAGs) and glycoproteins are essential components for osteogenesis. We have examined rat osteoblasts, osteoid, transitional zone, and fully calcified bone matrix, utilizing Spicer's high-iron diaminethiocarbohydrazide-silver protein (HID-TCH-SP) method for sulfated glycoconjugates and Thiéry's periodate-TCH-SP (PA-TCH-SP) method for vicinal glycol-containing glycoconjugates. HID-TCH-SP stained cytoplasmic granules of osteoblasts. Stain deposits in the extracellular matrix were observed in decreasing amounts in osteoid, the transitional zone, and fully calcified bone matrix. Enzyme digestion with testicular hyaluronidase removed most HID-TCH-SP stain deposits. PA-TCH-SP staining was observed with increasing intensity in rough endoplasmic reticulum, Golgi saccules, and cytoplasmic granules. Collagen fibrils in osteoid were weakly stained with PA-TCH-SP, and their staining appeared even weaker in fully calcified bone matrix. In contrast, collagen fibrils in calcified cartilage stained intensely with the PA-TCH-SP method. Focal circular profiles (0.1-0.5 mumol in diameter), which lacked collagen fibrils but reacted moderately with PA-TCH-SP, were frequently seen in the transitional zone and fully calcified bone matrix, but were only occasionally present in osteoid. The presence of testicular hyaluronidase-resistant GAG and acid phosphatase in these focal areas suggests that they represent sites of GAG degradation. The eventual loss of HID-TCH-SP staining in the bone matrix suggests that removal of sulfated glycoconjugates may be a requisite for expansion of initial calcification sites and/or complete calcification.
Histological and chemical diagnosis of a combat lesion in Triceratops.
DAnastasio R, Cilli J, Bacchia F, Fanti F, Gobbo G, Capasso L Sci Rep. 2022; 12(1):3941.
PMID: 35393445 PMC: 8990019. DOI: 10.1038/s41598-022-08033-2.
Smith A, Singhrao S, Newman G, Waddington R, Embery G Histochem J. 1997; 29(1):1-9.
PMID: 9088940 DOI: 10.1023/a:1026406932452.
Occurrence of osteoblast necroses during ossification of long bone cortices in mouse fetuses.
Zimmermann B Cell Tissue Res. 1994; 275(2):345-53.
PMID: 8111841 DOI: 10.1007/BF00319433.
Nakamura H, Kenmotsu S, Sakai H, Ozawa H Cell Tissue Res. 1995; 280(2):225-33.
PMID: 7540113 DOI: 10.1007/BF00307793.
Nefussi J, Septier D, Collin P, Goldberg M, FOREST N Calcif Tissue Int. 1989; 44(1):11-9.
PMID: 2492883 DOI: 10.1007/BF02556235.