シスプラチン、シスジアミンジクロロプラチナム cis-diamine-dichloroplatinum
出典(authority):フリー百科事典『ウィキペディア(Wikipedia)』「2015/12/14 14:13:21」(JST)
IUPAC命名法による物質名 | |
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(SP-4-2)-Diamminedichloroplatinum
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臨床データ | |
胎児危険度分類 |
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法的規制 |
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投与方法 | 点滴静注 |
薬物動態データ | |
生物学的利用能 | - |
血漿タンパク結合 | 98%(24時間) |
代謝 | - |
半減期 | 20〜30分 |
排泄 | 尿中 |
識別 | |
CAS番号 | 15663-27-1 |
ATCコード | L01XA01 |
PubChem | CID: 84691 |
DrugBank | APRD00359 |
KEGG | D00275 |
化学的データ | |
化学式 | Cl2H6N2Pt |
分子量 | 300.05 |
シスプラチン(cisplatin : CDDP)は白金錯体に分類される抗悪性腫瘍剤(抗がん剤)。シスプラチンの「シス」は、立体化学の用語のシスに由来する。錯体の中心金属は白金、配位子はアンミンと塩化物イオンであり、物質名はシス-ジアミンジクロロ白金(II)(cis-diamminedichloro-platinum(II)、cis-[PtCl2(NH3)2])である。なお、日光によって分解されるため、直射日光を避けて保存する必要があり、点滴にかかる時間を長く取る必要がある場合は点滴容器の遮光が必要となることもある。
商品名は、ブリプラチン(ブリストル・マイヤーズ)、ランダ(日本化薬)など。白金製剤としては、ほかにカルボプラチン、ネダプラチン、オキサリプラチンがある。 薬理作用を発現するのはシス型だけでトランス型は抗がん作用を示さない。
シスプラチンは、1845年にイタリアの化学者ミケーレ・ペイローネ(Michele Peyrone、1813-1883年)により錯体の研究材料として合成され[1]、「ペイロン塩(Peyrone's salt)」と呼ばれた。
1965年、アメリカ合衆国のバーネット・ローゼンバーグ(w:Barnett Rosenberg)らは、細菌に対して電場が及ぼす影響を調べている時に、偶然プラチナ電極の分解産物が大腸菌の増殖を抑制し、フィラメントを形成させることを発見した。その後1969年には、ローゼンバーグらにより白金化合物の大腸菌に対する細胞分裂阻止作用を応用して癌細胞の分裂抑制に対する研究が行われ、その結果ペイロン塩、つまりシスプラチンが動物腫瘍において比較的広い抗腫瘍スペクトルを有する化合物であることが判明した。
1972年にはアメリカ国立癌研究所(NCI)の指導で臨床試験が開始されたが、強い腎毒性のため、いったんは開発が中断された。しかし、その後シスプラチン投与時に大量の水分負荷と、さらに利尿薬を使用することによって腎障害を軽減することが可能となった。その後の臨床開発により、1978年にカナダ、アメリカ等で承認され、1983年に日本で承認された。
シスプラチンの合成反応は、トランス効果の典型例である。まず、テトラクロリド白金(II)酸カリウム([PtCl4]2−)を出発物質とする。最初のNH3基は4つのCl基どれとも無作為に置換される。しかし、Cl−はNH3より大きなトランス効果を持ち、そのトランス位を置換活性とするため、NH3基の置換は、すでに存在しているNH3基に対してトランスの位置にはあまりおこらず、Cl基のトランスの位置におきやすい。したがって、2番目のNH3基はシス型に置換される。一方、[Pt(NH3)4]2+が出発物質であれば、Cl基のトランス効果のため2番目のCl基は最初のCl基のトランスの位置に入り、生成物はトランス型になる。
en:Image:trans_effect.png
シスプラチンは、DNAの構成塩基であるグアニン、アデニンのN-7位に結合する。2つの塩素原子部位でDNAと結合するため、DNA鎖内には架橋が形成される。シス体に比べ、トランス体は架橋が形成されにくいため、投与量の制限により臨床的に用いることはできない。
禁忌:重篤な腎障害
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この項目は、薬学に関連した書きかけの項目です。この項目を加筆・訂正などしてくださる協力者を求めています(プロジェクト:薬学/Portal:医学と医療)。 |
この項目は、医学に関連した書きかけの項目です。この項目を加筆・訂正などしてくださる協力者を求めています(プロジェクト:医学/Portal:医学と医療)。 |
Systematic (IUPAC) name | |
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(SP-4-2)-diamminedichloroplatinum(II)
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Clinical data | |
Trade names | Platinol |
AHFS/Drugs.com | monograph |
MedlinePlus | a684036 |
Pregnancy category |
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Legal status |
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Routes of administration |
Intravenous |
Pharmacokinetic data | |
Bioavailability | complete |
Protein binding | > 95% |
Biological half-life | 30-100 hours |
Excretion | Renal |
Identifiers | |
CAS Number | 15663-27-1 Y |
ATC code | L01XA01 |
PubChem | CID: 84691 |
DrugBank | DB00515 Y |
ChemSpider | 76401 N |
UNII | Q20Q21Q62J Y |
KEGG | D00275 Y |
ChEBI | CHEBI:27899 Y |
ChEMBL | CHEMBL2068237 N |
PDB ligand ID | CPT (PDBe, RCSB PDB) |
Chemical data | |
Formula | H6Cl2N2Pt |
Molecular mass | 300.01 g/mol |
SMILES
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InChI
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Cisplatin, cisplatinum, platamin, neoplatin, cismaplat[1] or cis-diamminedichloroplatinum(II)[2] (CDDP) is a chemotherapy drug. It was the first member of a class of platinum-containing anti-cancer drugs, which now also includes carboplatin and oxaliplatin.[3] These platinum complexes react in vivo, binding to and causing crosslinking of DNA, which ultimately triggers apoptosis (programmed cell death).
It is on the World Health Organization's List of Essential Medicines, a list of the most important medications needed in a basic health system.[4]
Cisplatin is administered intravenously as short-term infusion in normal saline for treatment of solid malignancies. It is used to treat various types of cancers, including sarcomas, some carcinomas (e.g., small cell lung cancer, and ovarian cancer), lymphomas, bladder cancer, cervical cancer,[5] and germ cell tumors.
Cisplatin is particularly effective against testicular cancer; the cure rate was improved from 10% to 85%.[6]
In addition, cisplatin is used in Auger therapy.
Cisplatin has a number of side-effects that can limit its use:
This section needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. (November 2014) |
Following administration, one of the chloride ligands is slowly displaced by water (an aqua ligand), in a process termed aquation[10] . The aqua ligand in the resulting [PtCl(H2O)(NH3)2]+ is itself easily displaced, allowing the platinum atom to bind to bases. Of the bases on DNA, guanine is preferred. Subsequent to formation of [PtCl(guanine-DNA)(NH3)2]+, crosslinking can occur via displacement of the other chloride ligand, typically by another guanine.[11] Cisplatin crosslinks DNA in several different ways, interfering with cell division by mitosis. The damaged DNA elicits DNA repair mechanisms, which in turn activate apoptosis when repair proves impossible. In 2008, researchers were able to show that the apoptosis induced by cisplatin on human colon cancer cells depends on the mitochondrial serine-protease Omi/Htra2.[12] Since this was only demonstrated for colon carcinoma cells, it remains an open question if the Omi/Htra2 protein participates in the cisplatin-induced apoptosis in carcinomas from other tissues.
Most notable among the changes in DNA are the 1,2-intrastrand cross-links with purine bases. These include 1,2-intrastrand d(GpG) adducts which form nearly 90% of the adducts and the less common 1,2-intrastrand d(ApG) adducts. 1,3-intrastrand d(GpXpG) adducts occur but are readily excised by the nucleotide excision repair (NER). Other adducts include inter-strand crosslinks and nonfunctional adducts that have been postulated to contribute to cisplatin's activity. Interaction with cellular proteins, particularly HMG domain proteins, has also been advanced as a mechanism of interfering with mitosis, although this is probably not its primary method of action.
Note that although cisplatin is frequently designated as an alkylating agent, it has no alkyl group and so cannot carry out alkylating reactions. It is correctly classified as alkylating-like.
Cisplatin combination chemotherapy is the cornerstone of treatment of many cancers. Initial platinum responsiveness is high but the majority of cancer patients will eventually relapse with cisplatin-resistant disease. Many mechanisms of cisplatin resistance have been proposed including changes in cellular uptake and efflux of the drug, increased detoxification of the drug, inhibition of apoptosis and increased DNA repair.[13] Oxaliplatin is active in highly cisplatin-resistant cancer cells in the laboratory; however, there is little evidence for its activity in the clinical treatment of patients with cisplatin-resistant cancer.[13] The drug paclitaxel may be useful in the treatment of cisplatin-resistant cancer; the mechanism for this activity is unknown.[14]
Transplatin, the trans stereoisomer of cisplatin, has formula trans-[PtCl2(NH3)2] and does not exhibit a comparably useful pharmacological effect. Its low activity is generally thought to be due to rapid deactivation of the drug before it can arrive at the DNA.[citation needed] It is toxic, and it is desirable to test batches of cisplatin for the absence of the trans isomer. In a procedure by Woollins et al., which is based on the classic 'Kurnakov test', thiourea reacts with the sample to give derivatives which can easily be separated and detected by HPLC.[15]
The compound cis-[Pt(NH3)2(Cl)2] was first described by Michele Peyrone in 1845, and known for a long time as Peyrone's salt.[16] The structure was deduced by Alfred Werner in 1893.[11] In 1965, Barnett Rosenberg, van Camp et al. of Michigan State University discovered that electrolysis of platinum electrodes generated a soluble platinum complex which inhibited binary fission in Escherichia coli (E. coli) bacteria. Although bacterial cell growth continued, cell division was arrested, the bacteria growing as filaments up to 300 times their normal length.[17] The octahedral Pt(IV) complex cis[PtCl4(NH3)2], but not the trans isomer, was found to be effective at forcing filamentous growth of E. coli cells. The square planar Pt(II) complex, cis-[PtCl2(NH3)2] turned out to be even more effective at forcing filamentous growth.[18][19] This finding led to the observation that cis-[PtCl2(NH3)2] was indeed highly effective at regressing the mass of sarcomas in rats.[20] Confirmation of this discovery, and extension of testing to other tumour cell lines launched the medicinal applications of cisplatin. Cisplatin was approved for use in testicular and ovarian cancers by the U.S. Food and Drug Administration on 19 December 1978.,[11][21][22] and in the UK (and in several other European countries) in 1979.[23]
The synthesis of cisplatin starts from potassium tetrachloroplatinate. [24] [25] The tetraiodide is formed by reaction with an excess of potassium iodide. Reaction with ammonia forms K2[PtI2(NH3)2] which is isolated as a yellow compound. When silver nitrate in water is added insoluble silver iodide precipitates and K2[Pt(OH2)2(NH3)2] remains in solution. Addition of potassium chloride will form the final product which precipitates [24] In the triiodo intermediate the addition of the second ammonia ligand is governed by the trans effect. [24]
For the synthesis of transplatin K2[PtCl4] is first converted to Cl2[Pt(NH3)4] by reaction with ammonia. The trans product is then formed by reaction with hydrochloric acid. [24]
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リンク元 | 「シスプラチン」「cisplatinum」 |
関連記事 | 「CD」 |
-CDDP
.