M R Zarrinkalam1, A Mulaibrahimovic, G J Atkins, R J Moore. 1. The Adelaide Centre for Spinal Research, SA Pathology, Institute of Medical and Veterinary Science (IMVS), Frome Road, Adelaide, SA 5000, Australia. reza.zarrinkalam@health.sa.gov.au
Abstract
UNLABELLED: Histomorphometric assessment of trabecular bone in osteoporotic sheep showed that bone volume, osteoid surface area, bone formation rate, and osteocyte density were reduced. In contrast, eroded surface area and empty lacunae density were increased. Changes in osteocyte density correlated with changes in osteoblast and osteoclast activity. INTRODUCTION: Osteocytes contribute to the regulation of the activity of osteoclasts and osteoblasts that together control bone mass. Osteocytes therefore likely play a role in the loss of bone mass associated with osteoporosis. The purpose of this study was to investigate the relationships between osteocyte lacunar density and other bone histomorphometric parameters in the iliac crest (IC) and lumbar spine (LS) of osteoporotic sheep. METHODS: Osteoporosis was induced in ten mature ewes by an established protocol involving a combination of ovariectomy, dexamethasone injection, and low calcium diet for 6 months. Five ewes were used as controls. Post-mortem IC and LS biopsies were collected and processed for further histomorphometric assessment. RESULTS: Bone volume, osteoid surface, and bone formation rate in the IC and LS of osteoporotic sheep were reduced compared to those of the controls. In contrast, eroded surface area was increased in osteoporotic sheep. In the osteoporotic group, osteocyte density was reduced in the LS region and to a greater extent in the IC region. The empty osteocyte lacunae were increased 1.7-fold in LS and 2.1-fold in IC in the osteoporotic group. The osteocyte density correlated positively with markers of osteoblast activity and negatively with those of osteoclast activity. CONCLUSIONS: Depletion of osteocytes and an increase in the empty lacunae could be important factors contributing to bone loss in this model since they may adversely affect intercellular communication between osteoblasts and osteoclasts. The regional differences in histology suggest that there may be different pathological mechanisms operating at different anatomical sites.
UNLABELLED: Histomorphometric assessment of trabecular bone in osteoporotic sheep showed that bone volume, osteoid surface area, bone formation rate, and osteocyte density were reduced. In contrast, eroded surface area and empty lacunae density were increased. Changes in osteocyte density correlated with changes in osteoblast and osteoclast activity. INTRODUCTION: Osteocytes contribute to the regulation of the activity of osteoclasts and osteoblasts that together control bone mass. Osteocytes therefore likely play a role in the loss of bone mass associated with osteoporosis. The purpose of this study was to investigate the relationships between osteocyte lacunar density and other bone histomorphometric parameters in the iliac crest (IC) and lumbar spine (LS) of osteoporotic sheep. METHODS:Osteoporosis was induced in ten mature ewes by an established protocol involving a combination of ovariectomy, dexamethasone injection, and low calcium diet for 6 months. Five ewes were used as controls. Post-mortem IC and LS biopsies were collected and processed for further histomorphometric assessment. RESULTS: Bone volume, osteoid surface, and bone formation rate in the IC and LS of osteoporotic sheep were reduced compared to those of the controls. In contrast, eroded surface area was increased in osteoporotic sheep. In the osteoporotic group, osteocyte density was reduced in the LS region and to a greater extent in the IC region. The empty osteocyte lacunae were increased 1.7-fold in LS and 2.1-fold in IC in the osteoporotic group. The osteocyte density correlated positively with markers of osteoblast activity and negatively with those of osteoclast activity. CONCLUSIONS: Depletion of osteocytes and an increase in the empty lacunae could be important factors contributing to bone loss in this model since they may adversely affect intercellular communication between osteoblasts and osteoclasts. The regional differences in histology suggest that there may be different pathological mechanisms operating at different anatomical sites.
Authors: Xiaodong Li; Michael S Ominsky; Qing-Tian Niu; Ning Sun; Betsy Daugherty; Diane D'Agostin; Carole Kurahara; Yongming Gao; Jin Cao; Jianhua Gong; Frank Asuncion; Mauricio Barrero; Kelly Warmington; Denise Dwyer; Marina Stolina; Sean Morony; Ildiko Sarosi; Paul J Kostenuik; David L Lacey; W Scott Simonet; Hua Zhu Ke; Chris Paszty Journal: J Bone Miner Res Date: 2008-06 Impact factor: 6.741
Authors: Isabel R Dias; José A Camassa; João A Bordelo; Pedro S Babo; Carlos A Viegas; Nuno Dourado; Rui L Reis; Manuela E Gomes Journal: Curr Osteoporos Rep Date: 2018-04 Impact factor: 5.096
Authors: Asal Askarinam; Aaron W James; Janette N Zara; Raghav Goyal; Mirko Corselli; Angel Pan; Pei Liang; Le Chang; Todd Rackohn; David Stoker; Xinli Zhang; Kang Ting; Bruno Péault; Chia Soo Journal: Tissue Eng Part A Date: 2013-04-04 Impact factor: 3.845
Authors: Stefan Maenz; Olaf Brinkmann; Raimund W Kinne; Matthias Bungartz; Ines Hasenbein; Christina Braun; Elke Kunisch; Victoria Horbert; Francesca Gunnella; André Sachse; Sabine Bischoff; Harald Schubert; Klaus D Jandt; Jörg Bossert; Dominik Driesch Journal: J Bone Miner Metab Date: 2020-04-15 Impact factor: 2.626
Authors: Srikara V Peelukhana; Shilpi Goenka; Brian Kim; Jay Kim; Amit Bhattacharya; Keith F Stringer; Rupak K Banerjee Journal: Ind Health Date: 2015-04-04 Impact factor: 2.179