背景資料
Parathyroid hormone （PTH）， or parathormone， is secreted by the parathyroid glands as a polypeptide containing 84 amino acids. It acts to increase the concentration of calciumin the blood， whereas calcitonin （a hormone produced by the parafollicular cells of the thyroid gland） acts to decrease calcium concentration. PTH acts to increase the concentration of calcium in the blood by acting upon parathyroid hormone receptorin three parts of the body: In the bones- It enhances the release of calcium from the large reservoir contained in the bones. Bone resorption is the normal destruction of bone by osteoclasts， which are indirectly stimulated by PTH. Stimulation is indirect since osteoclasts do not have a receptor for PTH； rather， PTH binds to osteoblasts， the cells responsible for creating bone. Binding stimulates osteoblasts to increase their expression of RANKL， which can bind to osteoclast precursors containing RANK， a receptor for RANKL. The binding of RANKL to RANK stimulates these precursors to fuse， forming new osteoclasts which ultimately enhances the resorption of bone.
In the kidney- It enhances active reabsorption of calcium from distal tubules and the thick ascending limb.
In the intestine- It enhances the absorption of calcium in the intestine by increasing the production of vitamin D and upregulating the enzyme responsible for 1-alpha hydroxylationof 25-hydroxy vitamin D， converting vitamin D to its active form （1，25-dihydroxy vitamin D） which effects the actual absorption of calcium （as Ca2+ ions） by the intestine via calbindin.
Recombinant Human full length PTH 1-84 has potential as an anti-osteoporotic agent， due to its properties as a bone formation stimulant， it increases bone turnover， stimulating osteoblasts and reducing both vertebral and non vertebral fractures.
序列
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來源宿主
大腸桿菌中重組表達
溶解建議
提供的重組人甲狀旁腺素（1-84）產品為白色無菌凍干粉末.推薦使用無菌的18MΩ的超純水來溶解，濃度不低于100ug/ml，便于后續稀釋.
保存建議
Lyophilized Parathyrin although stable at room temperature for 3 weeks， should be stored desiccated below -18℃. Upon reconstitution PTH should be stored at 4℃ between 2-7 days and for future use below -18℃. For long term storage it is recommended to add a carrier protein （0.1% HSA or BSA）. Please prevent freeze-thaw cycles.
其他
ProSpec 是一家全球著名細胞因子蛋白生產和研發的公司，具有20多年的生產經驗，專注于蛋白（重組及合成）生產研發。我們的核心產品包括：干擾素、白介素、骨蛋白、腫瘤壞死因子、成纖維生長因子、瘦素、干細胞因子、催乳素、表皮生長因子、胰島素樣生長因子、神經生長因子、集落刺激因子、激素、酶、病毒抗原以及各種重組蛋白等。 的生產工藝和規模使其可以提供毫克到克級蛋白，價格優于同類公司。絕大部分產品是天然成熟型蛋白，而不含有標簽蛋白。考慮到大部分研究者希望能更靈活地配制蛋白溶液，ProSpec-Tany絕大部分產品沒有添加保護劑或鹽，這就對工藝提出了更高的要求。同時，ProSpec-Tany絕大部分產品為凍干粉，因此易于運輸和保存。
