Ageing induces a decrease in bone mass, and osteoporosis with its accompanying decrease in bone mass is widely recognised as a major public heath problem. Bone loss with increasing age may be due to decreased osteoblastic bone formation and increased osteoclastic bone resorption. Pharmacologic and nutritional factors may prevent bone loss with ageing. Chemical compounds in food and plants, which regulate on bone metabolism, has been to be worthy of notice in the prevention of osteoporsis. Food chemical factors play a role in bone health and may be important in the prevention of bone loss with increasing age.
Masayoshi Yamaguchi, Ph.D., IOM, FAOE, DDG, DG, is Adjunct Professor, Department of Hematology and Medical Oncology, Emory University School of Medicine, Atlanta, GA, USA (2013 - ). Dr. Yamaguchi is engaged in the fields of endocrinology and cell signaling since 1971, and these researches are developed in the aspect of biochemistry, molecular biology, endocrinology, metabolism, nutrition, pharmacology, and toxicology. Dr Yamaguchi has an interesting for cell signaling mechanism, bone biology, nutritional factor and osteoporosis prevention, diabetes and diabetic osteoporosis, cancer biology, and cancer cell bone metastasis. Dr. Yamaguchi discovered two novel proteins and genes; cell signaling suppressor protein (named regucalcin; 1978) and transcriptional factor RGPR-p117 (regucalcin gene promoter region-related protein; 2001). Dr Yamaguchi generated regucalcin transgenic rats, which were registered as international patents including USA, EU and Japan, and this animal was found to induce osteoporosis and hyperlipidemia. Moreover, Dr. Yamaguchi proposed the potential role of regucalcin as a key suppressor protein in carcinogenesis. Thus far, Dr Yamaguchi published over 550 English articles to professional journals with peer-review, and registered over 20 national and international patents.