Cisplatin

Cisplatin
Systematic (IUPAC) name
(SP-4-2)-diamminedichloroplatinum(II)
Clinical data
Trade names Platinol
AHFS/Drugs.com monograph
MedlinePlus a684036
Pregnancy
category
  • US: D (Evidence of risk)
Routes of
administration		 Intravenous
Legal status
Legal status
Pharmacokinetic data
Bioavailability complete
Protein binding > 95%
Biological half-life 30–100 hours
Excretion Renal
Identifiers
CAS Number 15663-27-1 YesY
ATC code L01XA01 (WHO)
PubChem CID 84691
DrugBank DB00515 YesY
ChemSpider 76401 N
UNII Q20Q21Q62J YesY
KEGG D00275 YesY
ChEBI CHEBI:27899 YesY
ChEMBL CHEMBL2068237 N
PDB ligand ID CPT (PDBe, RCSB PDB)
Chemical data
Formula Cl2H6N2Pt
Molar mass 300.01 g/mol
 NYesY (what is this?)  (verify)

Cisplatin, cisplatinum, platamin, neoplatin, cismaplat[1] or cis-diamminedichloridoplatinum(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 the body, binding to DNA and causing the DNA strands to crosslink, which ultimately triggers cells to die in a programmed way.

The compound 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]

Medical use

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.

Side effects

Cisplatin has a number of side-effects that can limit its use:

Mechanism of action

Cisplatin interferes with DNA replication, which kills the fastest proliferating cells, which in theory are carcinogenic. Following administration, one of the two chloride ligands is slowly displaced by water to give the aquo complex cis-[PtCl(NH3)2(H2O)]+, in a process termed aquation. Dissociation of the chloride ligand is favored inside the cell because where the background chloride concentration is 3–20% of the approximately 100 mM chloride concentration in the extracellular fluid.[10][11]

The aqua ligand in cis-[PtCl(NH3)2(H2O)]+ is itself easily displaced by the N-heterocyclic bases on DNA. Guanine preferentially binds. Subsequent to formation of [PtCl(guanine-DNA)(NH3)2]+, crosslinking can occur via displacement of the other chloride ligand, typically by another guanine.[12] 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.[13] 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.

Although cisplatin is frequently designated as an alkylating agent, it has no alkyl group and it therefore cannot carry out alkylating reactions. It is correctly classified as alkylating-like.

Cisplatin resistance

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.[14] 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.[14] The drug paclitaxel may be useful in the treatment of cisplatin-resistant cancer; the mechanism for this activity is unknown.[15]

Transplatin

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. 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.[16]

History

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.[17] The structure was deduced by Alfred Werner in 1893.[12] 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.[18] 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.[19][20] This finding led to the observation that cis-[PtCl2(NH3)2] was indeed highly effective at regressing the mass of sarcomas in rats.[21] 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.,[12][22][23] and in the UK (and in several other European countries) in 1979.[24]

Synthesis

The synthesis of cisplatin starts from potassium tetrachloroplatinate.[25][26] 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 [25] In the triiodo intermediate the addition of the second ammonia ligand is governed by the trans effect.[25]

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.[25]

See also

References

  1. ↑ "Substance Details: Cisplatin". SciFinder. Retrieved 2014-11-13.
  2. ↑ See also metal amine complex.
  3. ↑ Apps, M. G.; Choi, E. H. Y.; Wheate, N. J. (2015). "The state-of-play and future of platinum drugs". Endocrine-related Cancer 22 (4): 219–233. doi:10.1530/ERC-15-0237. PMID 26113607.
  4. ↑ "www.who.int" (PDF).
  5. ↑ "Cisplatin". National Cancer Institute. Retrieved 2014-11-13.
  6. ↑ Einhorn LH (1 November 1990). "Treatment of testicular cancer: a new and improved model". J. Clin. Oncol. 8 (11): 1777–81. PMID 1700077.
  7. ↑ Loehrer, P. J.; Einhorn, L. H. (May 1984). "Drugs five years later. Cisplatin". Annals of Internal Medicine 100 (5): 704–13. doi:10.7326/0003-4819-100-5-704. PMID 6370067.
  8. 1 2 3 Milosavljevic, N.; Duranton, C.; Djerbi, N.; Puech, P. H.; Gounon, P.; Lagadic-Gossmann, D.; Dimanche-Boitrel, M. T.; Rauch, C.; Tauc, M.; Counillon, L.; Poët, M. (2010). "Nongenomic effects of cisplatin: acute inhibition of mechanosensitive transporters and channels without actin remodeling". Cancer Res. 70 (19): 7514–22. doi:10.1158/0008-5472.CAN-10-1253. PMID 20841472. Lay summary – ScienceDaily.
  9. ↑ Levi, J. A.; Aroney, R. S.; Dalley, D. N. (June 1981). "Haemolytic anaemia after cisplatin treatment". Br. Med. J. (Clin. Res. Ed.) 282 (6281): 2003–4. doi:10.1136/bmj.282.6281.2003. PMC 1505958. PMID 6788166.
  10. ↑ Wang, Dong; Lippard, Stephen J. (2005). "Cellular processing of platinum anticancer drugs". Nature Reviews Drug Discovery 4 (4): 307–320. doi:10.1038/nrd1691. ISSN 1474-1776.
  11. ↑ Johnstone, Timothy C.; Suntharalingam, Kogularamanan; Lippard, Stephen J. (2016). "The Next Generation of Platinum Drugs: Targeted Pt(II) Agents, Nanoparticle Delivery, and Pt(IV) Prodrugs". Chem. Rev. 116: 3436–3486. doi:10.1021/acs.chemrev.5b00597.
  12. 1 2 3 Trzaska, Stephen (20 June 2005). "Cisplatin". Chemical & Engineering News 83 (25).
  13. ↑ Pruefer, F. G.; Lizarraga, F.; Maldonado, V.; Melendez-Zajgla, J. (June 2008). "Participation of Omi HtrA2 serine–protease activity in the apoptosis induced by cisplatin on SW480 colon cancer cells". J. Chemother. 20 (3): 348–54. doi:10.1179/joc.2008.20.3.348. PMID 18606591.
  14. 1 2 Stordal, B; Davey, M. (November 2007). "Understanding cisplatin resistance using cellular models". IUBMB Life 59 (11): 696–9. doi:10.1080/15216540701636287. PMID 17885832.
  15. ↑ Stordal, B.; Pavlakis, N.; Davey, R. (December 2007). "A systematic review of platinum and taxane resistance from bench to clinic: an inverse relationship". Cancer Treat. Rev. 33 (8): 688–703. doi:10.1016/j.ctrv.2007.07.013. PMID 17881133.
  16. ↑ Woollins, J. D.; Woollins, A.; Rosenberg, B. (1983). "The detection of trace amounts of trans-Pt(NH3)2Cl2 in the presence of cis-Pt(NH3)2Cl2. A high performance liquid chromatographic application of kurnakow's test". Polyhedron 2 (3): 175–178. doi:10.1016/S0277-5387(00)83954-6.
  17. ↑ Peyrone, M. (1844). "Ueber die Einwirkung des Ammoniaks auf Platinchlorür" [On the action of ammonia on platinum chloride]. Ann. Chem. Pharm. 51 (1): 1–29. doi:10.1002/jlac.18440510102.
  18. ↑ Rosenberg, B.; Vancamp, L.; Krigas, T. (1965). "Inhibition of cell division in Escherichia coli by electrolysis products from a platinum electrode". Nature 205 (4972): 698–699. doi:10.1038/205698a0. PMID 14287410.
  19. ↑ Rosenberg, B.; Van Camp, L.; Grimley, E. B.; Thomson, A. J. (March 1967). "The inhibition of growth or cell division in Escherichia coli by different ionic species of platinum(IV) complexes". J. Biol. Chem. 242 (6): 1347–52. PMID 5337590.
  20. ↑ Thomson, A. J. (2007). Christie, D. A.; Tansey, E. M., eds. "The Discovery, Use and Impact of Platinum Salts as Chemotherapy Agent for Cancer". Wellcome Trust Witnesses to Twentieth Century Medicine 30: 6–15. ISBN 978-0-85484-112-7.
  21. ↑ Rosenberg, B.; Van Camp, L.; Trosko, J. E.; Mansour, V. H. (April 1969). "Platinum compounds: a new class of potent antitumour agents". Nature 222 (5191): 385–6. doi:10.1038/222385a0. PMID 5782119.
  22. ↑ Carpenter, D. P. (2010). Reputation and power: organizational image and pharmaceutical regulation at the FDA. Princeton, NJ: Princeton University Press. ISBN 0-691-14180-0.
  23. ↑ "Approval Summary for cisplatin for Metastatic ovarian tumors". FDA Oncology Tools. Food and Drug Administration, Center for Drug Evaluation and Research. 19 December 1978. Archived from the original on 8 February 2008. Retrieved 2009-07-15.
  24. ↑ Wiltshaw, E. (1979). "Cisplatin in the treatment of cancer". Platinum Metals Review 23 (3): 90–8.
  25. 1 2 3 4 Alderden, Rebecca A.; Hall, Matthew D.; Hambley, Trevor W. (2006). "The Discovery and Development of Cisplatin". J. Chem. Educ. 83 (5): 728. doi:10.1021/ed083p728.
  26. ↑ Dhara, S. C. (1970). "Cisplatin". Indian J. Chem. 8: 193–134.

External links

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