Qi Yao , Kanako Tsuboi , Hiromi Hongo , Mako Sakakibara , Tomomaya Yamamoto , Mai Haraguchi-Kitakamae , Hotaka Ishizu , Xuanyu Liu , Yan Shi , Weisong Li , Jiaxin Cui , Tomohiro Shimizu , Norio Amizuka , Atsuro Yokoyama , Tomoka Hasegawa , Kiwamu Sakaguchi
{"title":"模拟II型糖尿病的自发性糖尿病Torii-Leprfa （SDT-fa/fa）大鼠股骨的组织化学评价","authors":"Qi Yao , Kanako Tsuboi , Hiromi Hongo , Mako Sakakibara , Tomomaya Yamamoto , Mai Haraguchi-Kitakamae , Hotaka Ishizu , Xuanyu Liu , Yan Shi , Weisong Li , Jiaxin Cui , Tomohiro Shimizu , Norio Amizuka , Atsuro Yokoyama , Tomoka Hasegawa , Kiwamu Sakaguchi","doi":"10.1016/j.job.2024.100602","DOIUrl":null,"url":null,"abstract":"<div><h3>Objective</h3><div>To elucidate the mechanisms underlying diabetic osteoporosis, we conducted a comprehensive histological examination of the femora of Spontaneously Diabetic Torii-<em>Lepr</em><sup><em>fa</em></sup> (SDT-<em>fa/fa</em>) rats, an established model of obesity-related type 2 diabetes.</div></div><div><h3>Materials and methods</h3><div>Femora from 12 30-week-old male SDT-<em>fa/fa</em> rats and age-matched Sprague–Dawley (SD) rats (controls) were used for detailed histochemical analyses, including tartrate-resistant acid phosphatase (TRAP), cathepsin K, tissue nonspecific alkaline phosphatase (ALP), phosphoethanolamine/phosphocholine phosphatase 1 (PHOSPHO1), dentin matrix protein 1 (DMP-1), matrix extracellular phosphoglycoprotein (MEPE), sclerostin, osteocalcin staining, silver impregnation, von Kossa staining, and micro-computed tomography (CT).</div></div><div><h3>Results</h3><div>Micro-CT and hematoxylin-eosin staining demonstrated significantly reduced trabecular bone volume in the femoral metaphyses of SDT-<em>fa/fa</em> rats. Although the number of TRAP-positive osteoclasts per bone surface remained comparable between both groups, SDT-<em>fa/fa</em> rats exhibited reduced areas of ALP-positive and PHOSPHO1-reactive mature osteoblasts/BS. Silver impregnation revealed a well-organized osteocytic lacunar–canalicular system in both groups. However, immunostaining identified aberrant DMP-1 and MEPE expression localized predominantly in the lacunae in SDT-<em>fa/fa</em> rats and in the lacunae and canaliculi of SD rats. Additionally, intense osteocalcin and sclerostin immunoreactivity was detected in osteocytes, along with a higher proportion of osteocalcin-positive osteocytes in SDT-<em>fa/fa</em> rats, distinguishing them from controls.</div></div><div><h3>Conclusion</h3><div>SDT-<em>fa/fa</em> rats displayed a significant decline in osteoblastic function and distinctive distribution patterns of osteocyte-derived peptides, suggesting that this diabetic model may manifest alterations in osteoblastic activity and the osteocytic lacunar-canalicular network.</div></div>","PeriodicalId":45851,"journal":{"name":"Journal of Oral Biosciences","volume":"67 1","pages":"Article 100602"},"PeriodicalIF":2.3000,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Histochemical assessment of the femora of spontaneously diabetic torii-leprfa (SDT-fa/fa) rats that mimic type II diabetes\",\"authors\":\"Qi Yao , Kanako Tsuboi , Hiromi Hongo , Mako Sakakibara , Tomomaya Yamamoto , Mai Haraguchi-Kitakamae , Hotaka Ishizu , Xuanyu Liu , Yan Shi , Weisong Li , Jiaxin Cui , Tomohiro Shimizu , Norio Amizuka , Atsuro Yokoyama , Tomoka Hasegawa , Kiwamu Sakaguchi\",\"doi\":\"10.1016/j.job.2024.100602\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><h3>Objective</h3><div>To elucidate the mechanisms underlying diabetic osteoporosis, we conducted a comprehensive histological examination of the femora of Spontaneously Diabetic Torii-<em>Lepr</em><sup><em>fa</em></sup> (SDT-<em>fa/fa</em>) rats, an established model of obesity-related type 2 diabetes.</div></div><div><h3>Materials and methods</h3><div>Femora from 12 30-week-old male SDT-<em>fa/fa</em> rats and age-matched Sprague–Dawley (SD) rats (controls) were used for detailed histochemical analyses, including tartrate-resistant acid phosphatase (TRAP), cathepsin K, tissue nonspecific alkaline phosphatase (ALP), phosphoethanolamine/phosphocholine phosphatase 1 (PHOSPHO1), dentin matrix protein 1 (DMP-1), matrix extracellular phosphoglycoprotein (MEPE), sclerostin, osteocalcin staining, silver impregnation, von Kossa staining, and micro-computed tomography (CT).</div></div><div><h3>Results</h3><div>Micro-CT and hematoxylin-eosin staining demonstrated significantly reduced trabecular bone volume in the femoral metaphyses of SDT-<em>fa/fa</em> rats. Although the number of TRAP-positive osteoclasts per bone surface remained comparable between both groups, SDT-<em>fa/fa</em> rats exhibited reduced areas of ALP-positive and PHOSPHO1-reactive mature osteoblasts/BS. Silver impregnation revealed a well-organized osteocytic lacunar–canalicular system in both groups. However, immunostaining identified aberrant DMP-1 and MEPE expression localized predominantly in the lacunae in SDT-<em>fa/fa</em> rats and in the lacunae and canaliculi of SD rats. Additionally, intense osteocalcin and sclerostin immunoreactivity was detected in osteocytes, along with a higher proportion of osteocalcin-positive osteocytes in SDT-<em>fa/fa</em> rats, distinguishing them from controls.</div></div><div><h3>Conclusion</h3><div>SDT-<em>fa/fa</em> rats displayed a significant decline in osteoblastic function and distinctive distribution patterns of osteocyte-derived peptides, suggesting that this diabetic model may manifest alterations in osteoblastic activity and the osteocytic lacunar-canalicular network.</div></div>\",\"PeriodicalId\":45851,\"journal\":{\"name\":\"Journal of Oral Biosciences\",\"volume\":\"67 1\",\"pages\":\"Article 100602\"},\"PeriodicalIF\":2.3000,\"publicationDate\":\"2025-03-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Oral Biosciences\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S1349007924002512\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"2024/12/18 0:00:00\",\"PubModel\":\"Epub\",\"JCR\":\"Q1\",\"JCRName\":\"DENTISTRY, ORAL SURGERY & MEDICINE\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Oral Biosciences","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1349007924002512","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2024/12/18 0:00:00","PubModel":"Epub","JCR":"Q1","JCRName":"DENTISTRY, ORAL SURGERY & MEDICINE","Score":null,"Total":0}
Histochemical assessment of the femora of spontaneously diabetic torii-leprfa (SDT-fa/fa) rats that mimic type II diabetes
Objective
To elucidate the mechanisms underlying diabetic osteoporosis, we conducted a comprehensive histological examination of the femora of Spontaneously Diabetic Torii-Leprfa (SDT-fa/fa) rats, an established model of obesity-related type 2 diabetes.
Materials and methods
Femora from 12 30-week-old male SDT-fa/fa rats and age-matched Sprague–Dawley (SD) rats (controls) were used for detailed histochemical analyses, including tartrate-resistant acid phosphatase (TRAP), cathepsin K, tissue nonspecific alkaline phosphatase (ALP), phosphoethanolamine/phosphocholine phosphatase 1 (PHOSPHO1), dentin matrix protein 1 (DMP-1), matrix extracellular phosphoglycoprotein (MEPE), sclerostin, osteocalcin staining, silver impregnation, von Kossa staining, and micro-computed tomography (CT).
Results
Micro-CT and hematoxylin-eosin staining demonstrated significantly reduced trabecular bone volume in the femoral metaphyses of SDT-fa/fa rats. Although the number of TRAP-positive osteoclasts per bone surface remained comparable between both groups, SDT-fa/fa rats exhibited reduced areas of ALP-positive and PHOSPHO1-reactive mature osteoblasts/BS. Silver impregnation revealed a well-organized osteocytic lacunar–canalicular system in both groups. However, immunostaining identified aberrant DMP-1 and MEPE expression localized predominantly in the lacunae in SDT-fa/fa rats and in the lacunae and canaliculi of SD rats. Additionally, intense osteocalcin and sclerostin immunoreactivity was detected in osteocytes, along with a higher proportion of osteocalcin-positive osteocytes in SDT-fa/fa rats, distinguishing them from controls.
Conclusion
SDT-fa/fa rats displayed a significant decline in osteoblastic function and distinctive distribution patterns of osteocyte-derived peptides, suggesting that this diabetic model may manifest alterations in osteoblastic activity and the osteocytic lacunar-canalicular network.
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