合成代谢类固醇激素类固醇减肥

描述：

类固醇是具有以特定构型排列的四个环的有机化合物。实例包括膳食脂质胆固醇，性激素雌二醇和睾酮和抗炎药物地塞米松。类固醇具有两个主要的生物学功能：某些类固醇（例如胆固醇）是改变膜流动性的细胞膜的重要组分，并且许多类固醇是激活类固醇激素受体的信号分子。
类固醇核心结构由十七个碳原子组成，以四个“稠合”环结合：三个六元环己烷环（第一图中的环A，B和C）和一个五元环戊烷环（D环）。类固醇通过连接到该四环核上的官能团和环的氧化态而变化。甾醇是在位置3具有羟基并且源自胆甾烷的骨架的类固醇的形式。它们还可以通过环结构的变化（例如，产生类固醇如维生素D3的环断裂）更显着地变化。
数百种类固醇存在于植物，动物和真菌中。所有类固醇在来自甾醇羊毛甾醇（动物和真菌）或环木菠萝烯醇（植物）的细胞中制造。羊毛甾醇和环木菠萝烯醇来自三萜烯角鲨烯的环化。



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Anabolic Row steroid Hormone Steroid For Weight Loss

Description:

A steroid is an organic compound with four rings arranged in a specific configuration. Examples include the dietary lipid cholesterol, the sex hormones estradiol and testosteron and the anti-inflammatory drug dexamethasone. Steroids have two principal biological functions: certain steroids (such as cholesterol) are important components of cell membranes which alter membrane fluidity, and many steroids are signaling molecules which activate steroid hormone receptors.
The steroid core structure is composed of seventeen carbon atoms, bonded in four 'fused' rings: three six-member cyclohexane rings (rings A, B and C in the first illustration) and one five-membercyclopentane ring (the D ring). Steroids vary by the functional groups attached to this four-ring core and by the oxidation state of the rings. Sterols are forms of steroids with a hydroxyl group at position three and a skeleton derived from cholestane. They can also vary more markedly by changes to the ring structure (for example, ring scissions which produce secosteroids such asvitamin D3).
Hundreds of steroids are found in plants, animals and fungi. All steroids are manufactured in cells from the sterols lanosterol (animals and fungi) or cycloartenol (plants). Lanosterol and cycloartenol are derived from the cyclization of the triterpene squalene.



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