コネッシン 化学特性,用途語,生産方法
外観
白色～うすい黄色, 結晶～結晶性粉末
溶解性
エタノールに溶け、水にほとんど溶けない。
解説
コネシン．ネリイン(neriine)，ロケシン(roquessine)ともいう．ガガイモ科低木Holarrhena antidysentericaの枝皮および根皮に含有されるステロイドアルカロイド．クルチアルカロイドの一つでもある．無色の板状結晶．融点127～129 ℃．[α]20D＋25°(エタノール)．アメーバ赤痢の治療に用いられ，エメチンに比べておう吐の副作用がない．抗菌性がある．ピクリン酸塩は黄色の針状晶．融点222～224 ℃．
用途
薬理作用研究用。
説明
Conessine is a naturally occurring steroid alkaloid found in a number of plant species from the
Apocynaceae family, which have been used in traditional herbal medicine as a treatment for amoebic dysentery. In a radioligand-
based high-
throughput screen, conessine demonstrated high affinity for both rat and human histamine H3 receptors (K
is = 5.2 and 24.5 nM, respectively) and high selectivity against histamine receptors H1, H2, and H4. Though conessine potently blocks H3 agonist-
stimulated GTPγS binding in cell-
and tissue-
based functional assays and efficiently crosses the blood-
brain barrier, it has a poor rate of CNS clearance.
使用
Conessine is a steroidal dibasic alkaloid with a rigid steroid-based skeleton. Conessine is a potent and selective histamine H3 receptor antagonist.
定義
ChEBI: A steroid alkaloid that is con-5-enine substituted by a N,N-dimethylamino group at position 3. It has been isolated from the plant species of the family Apocynaceae.
生物活性
Potent and selective histamine H 3 receptor antagonist (pK i values are 7.61 and 8.27 at rat and human H 3 receptors respectively). A steroidal alkaloid that displays in vitro antiplasmodial activity (IC 50 = 1.04 μ M). Also has high affinity for α 2C adrenoceptors (pK i = 7.98).
純化方法
It crystallises from acetone, sublimes at 95o/0.01mm and boils at 0.1mm with bath temperature at 220o. The dihydrochloride has m >340o (browns at 235o and decomposes at 338-240o) and has [] D +9.3o (c 2, H2O). [Marshall & Johnson J Am Chem Soc 84 1458 1962, Beilstein 22 III/IV 4382.]
コネッシン 上流と下流の製品情報
原材料
準備製品