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Sclerostin and bone metabolism markers in hyperthyroidism before treatment and interrelations between them

100%

Sarıtekin İ., Açıkgöz Ş., Bayraktaroğlu T., Kuzu F., Can M., Güven B., Mungan G., Büyükuysal Ç., Sarıkaya S.

2017

vol. 64

issue 4

597-602

Sclerostin, which is a glycoprotein produced by osteocytes, reduces the formation of bones by inhibiting the Wnt signal pathway. Thyroid hormones are related with Wnt signal pathway and it has been reported that increased thyroid hormones in hyperthyroidism fasten epiphysis maturation in childhood, and increase the risk of bone fractures by stimulating the bone loss in adults. The aim of this study was to examine the sclerostin serum levels, the relation between sclerostin and thyroid hormones as well as the biochemical markers of the bone metabolism in patients with hyperthyroidism (including multinodular goiter and Graves' disease), whose treatments have not started yet. No difference was found in the serum sclerostin levels between the hyperthyroidism group (n=24) and the control group (n=24) (p=0.452). The serum osteocalcin levels and 24-hour urinary phosphorus excretion were found to be higher in the hyperthyroid group than in the control group (p<0.001, p=0.009). A positive correlation was determined between the sclerostin and bone alkaline phosphatase levels (p<0.001); a negative correlation between the osteocalcin and thyroid stimulating hormone (TSH) (p<0.05); a positive correlation between the osteocalcin and thyroid hormones (FT3,FT4) (p<0.001); and a positive correlation between the deoxypyridinoline and hydroxyproline (p<0.001). No correlation was determined between sclerostin and TSH,FT3,FT4 (p>0.05). Therefore, we consider that a long-term study that covers the pre-post treatment stages of hyperthyroidism, including both the destruction and construction of the skeleton would be more enlightening. Moreover, the assessment of the synthesis of sclerostin in the bone tissue and in the serum level might show differences.

Role of osteoblasts and osteocytes in bone remodeling

51%

Cegieła U., Korzeniowska H., Wilk A.

Annales Academiae Medicae Silesiensis

2011

vol. 65

issue 3

49-53

Bone remodeling is an integrated process of resorption and osteogenesis. Such processes are performed on cyclical basis, as regulated by specifi c bone cells, including osteoclasts, osteoblasts and osteocytes. Not long ago it was claimed that bone remodeling involves only osteoclasts, conditioning bone resorption and osteoblasts, responsible for osteogenesis. Recent studies have shown however, that the major regulatory part in bone remodeling is taken by osteocytes. Such cells regulate the activity of osteoclasts and osteoblasts, infl uencing the RANK/RANKL/OPG pathway as well as the signalling canonical pathway Wint/􀈕-catenine. The role of osteocytes in regulation of RANK/RANKL/OPG pathway is basically associated with regulation of RANKL secretion by osteoblasts, while in regulation of Wnt/ /􀈕-catenine, with secretion of sclerostin, which inhibits osteogenesis by blocking activation, proliferation and diff erentiation of osteoblasts from the mesenchymal stem cells and slows down Wnt/􀈕-catenine signalling.

Aktywność metaboliczna szkieletu związana jest z ciągłą przebudową tkanki kostnej. Mechanizm ten jest niezbędny do przystosowania szkieletu do warunków zewnętrznych i obciążeń mechanicznych oraz zapewnia równowagę mineralną. Prawidłowy przebieg procesu przebudowy kości zależy od aktywności komórek kostnych, do których należą osteoblasty, osteoklasty i osteocyty. Osteoblasty uczestniczą w kościotworzeniu oraz resorpcji kości. Wydzielają cytokiny i czynniki wzrostu, dzięki czemu pełnią rolę regulacyjną procesu osteoklastogenezy i resorpcji kości przez wpływ na szlak regulacyjny RANK/RANKL/OPG. Osteocyty z kolei regulują osteoblastogenezę, proces apoptozy osteoblastów oraz funkcję szlaku RANK/RANKL/OPG przez wpływ na kanoniczny szlak sygnalizacyjny Wnt/􀈕-katenina. Osteocyty wydzielają również sklerostynę, działającą antagonistycznie w stosunku do szlaku kanonicznego WNT/􀈕–katenina. Sklerostyna hamuje proces kościotworzenia. Szlak Wnt/􀈕–katenina może być potencjalnym celem terapii, prowadzącym do zwiększenia masy kostnej, natomiast sklerostyna – jako inhibitor tego szlaku – stanowi nowy obiecujący cel w badaniach nad terapią anaboliczną schorzeń tkanki kostnej.

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1 Acta Biochimica Polonica

1 Annales Academiae Medicae Silesiensis

1 2017

1 2011

1 Açıkgöz Ş.

1 Bayraktaroğlu T.

1 Büyükuysal Ç.

1 Can M.

1 Cegieła U.

1 Güven B.

1 Korzeniowska H.

1 Kuzu F.

1 Mungan G.

1 Sarıkaya S.

1 Sarıtekin İ.

1 Wilk A.

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Sclerostin and bone metabolism markers in hyperthyroidism before treatment and interrelations between them

Role of osteoblasts and osteocytes in bone remodeling