#PAGE_PARAMS# #ADS_HEAD_SCRIPTS# #MICRODATA#

Evaluation of the reactivating efficacy of selected reactivators of paraoxon-inhibited acetylcholinesterase in vitro


Authors: O. Holas 1;  K. Musílek 1,2;  V. Opletalová 1;  K. Kuča 2,3
Authors‘ workplace: Univerzita Karlova v Praze, Farmaceutická fakulta v Hradci Králové, Katedra farmaceutické chemie a kontroly léčiv 1;  Univerzita obrany Brno, Fakulta vojenského zdravotnictví Hradec Králové, Katedra toxikologie 2;  Univerzita obrany Brno, Fakulta vojenského zdravotnictví Hradec Králové, Centrum pokročilých studií 3
Published in: Čes. slov. Farm., 2010; 59, 18-22
Category: Original Articles

Overview

Organophosphorus pesticides (OPs) are ranked among the group of highly toxic irreversible inhibitors of acetylcholinesterase (AChE). The causal drugs in OPs intoxications are oxime reactivators of AChE. The reactivating efficacy of five newly prepared bispyridinium reactivators of acetylcholinesterase was tested on a model of a paraoxon-inhibited enzyme. The reactivating efficacy was tested by means of the standard in vitro test, the laboratory rat brain homogenate being used as the source of acetylcholinesterase. The result were compared with five commercially available AChE reactivators.

Key words:
acetylcholinesterase – organophosphorus pesticide – reactivator – in vitro – SAR


Sources

1. Bajgar, J.: Organophosphates/nerve agent poisoning: mechanism of action, diagnosis, prophylaxis, and treatment. Adv. Clin. Chem., 2004; 38, 151–216.

2. Marrs, T. C.: Organophosphate poisoning. Pharmacol. Therapeut., 1993; 58, 51–66.

3. Patocka, J., Kuca, K., Jun D.: Acetylcholinesterase and butyrylcholinesterase – important enzymes of human body. Acta Medica, 2004; 47, 215–228.

4. Satoh, T., Hosokawa, M.: Organophosphates and their impact on the global environment. Neurotoxicol., 2000; 21, 223–227.

5. Francotte, P., Graindorge, E., Boverie, S., de Tullio, P., Pirotte B.: Curr. Med. Chem., 2004; 11, 1757–1778.

6. Marklund, A., Andersson, B., Haglund, P.: Organophosphorus flame retardants and plasticizers in air from various indoor environments. J. Environ. Monit., 2005; 7, 814–819.

7. Tattersall, J.: Seizure activity post organophosphate exposure. Front. Biosci., 2009; 14, 3688-3711.

8. Patocka, J.: Vojenská toxikologie. 1. vyd. Praha: Grada Publishing a.s., 2004; 180.

9. Bajgar, J., Fusek, J., Kuca, K., Bartosova, L., Jun, D.: Treatment of organophosphate intoxication using cholinesterase reactivators: facts and fiction. Mini-Rev. Med. Chem., 2007; 7, 461–466.

10. Newmark, J.: Nerve agents. Neurologist, 2007; 13, 20–32.

11. Saxena, A., Sun, W., Luo, C., Myers, T. M., Koplovitz, I., Lenz, D. E., Doctor, B. P.: Bioscavenger for protection from toxicity of organophosphorus compounds. J. Mol. Neurosci., 2006; 30, 145–148.

12. Kuca, K., Jun, D., Musilek, K.: Structural requirements of acetylcholinesterase reactivators. Mini-Rev. Med. Chem., 2006; 3, 269–277.

13. Poziomek, E. J., Hackley, B. E., Steinberg, G. M.: Pyridinium aldoximes. J. Org. Chem., 1958; 23, 714–717.

14. Kuca, K., Jun, D., Musilek, K. Bajgar, J.: Reactivators of tabun-inhibited acetylcholinesterase: Structure-biological activity relationship. Front. Drug. Des. Discov., 2007; 3, 381–394.

15. Ekstrom, F., Pang, Y. P., Boman, M., Artursson, E., Akfur, C., Borjegren, S.: Crystal structures of acetylcholinesterase in complex with HI-6, Ortho-7 and obidoxime: structural basis for differences in the ability to reactivate tabun conjugates. Biochem. Pharmacol., 2006; 72, 597–607.

16. Ekstrom, F., Akfur, C., Tunemalm, A. K., Lundberg, S.: Structural changes of phenylalanine 338 and histidine 447 revealed by the crystal structures of tabun-inhibited murine acetylcholinesterase. Biochemistry, 2006; 45, 74–81.

17. Eddelston, M., Dawson, A. H., Buckley, N. A.: Management of acute organophosphorus pesticide poisoning. Lancet, 2008; 371, 597–607.

18. Tattersall, J. E.: Ion channel blockade by oximes and recovery of diaphragm muscle from soman poisoning in vitro. Br. J. Pharmacol., 1993; 108, 1006–1015.

19. Kuca, K., Cabal, J., Musilek, K., Jun, D., Bajgar, J.: Effective bisquaternary reactivators of tabun-inhibited AChE. J. Appl. Toxicol., 2005; 25, 491–495.

20. Musilek, K., Holas, O., Kuca, K., Jun, D., Dohnal, V., Dolezal, M.: Synthesis of asymmetrical bispyridinium compounds bearing cyano-moiety and evaluation of their reactivation activity against tabun and paraoxon-inhibited acetylcholinesterase. Bioorg. Med. Chem. Lett., 2006; 16, 5673–5676.

21. Bartosova, L., Kuca, K., Kunesova, G., Jun, D.: The acute toxicity of acetylcholinesterase reactivators in mice in relation to their structure. Neurotox. Res., 2006; 9, 291–296.

22. Worek, F., Thiermann, H., Szinicz, L., Eyer, P.: Kinetic analysis of interactions between human acetylcholinesterase, structurally different organophosphorus compounds and oximes. Biochem. Pharmacol., 2004; 68, 2237–2248.

23. Racakova, V., Jun, D., Opletalova, V., Kuca, K.: Reactivation of acetycholinesterase inhibited by the pesticide chlorpyrifos. J. Appl. Biomed., 2006; 4, 147–151.

24. Musilek, K., Holas, O., Kuca, K., Jun, D., Dohnal, V., Opletalova, V., Dolezal, M.: Novel series of bispyridinium compounds bearing a (Z)-but-2-ene linker—synthesis and evaluation of their reactivation activity against tabun and paraoxon-inhibited acetylcholinesterase. Bioorg. Med. Chem. Lett., 2007; 17, 3172–3176.

25. Sakurada, K., Matsubara, K., Shimizu, K., Shiono, H., Seto, Y., Tsuge, K., Yoshino, M., Sakai, I., Mukoyama, H., Takatori, T.: Pralidoxime iodide (2-pAM) penetrates across the blood-brain barrier. Neurochem. Res., 2003; 28, 1401–1407.

26. Okuno, S., Sakurada, K., Ohta, H., Ikegaya, H., Kazui, Y., Akutsu, T., Takatori, T., Iwadate, K.: Blood-brain barrier penetration of novel pyridinealdoxime methiodide (PAM)-type oximes examined by brain microdialysis with LC-MS/MS. Toxicol. Appl. Pharmacol., 2008; 227, 8–15.

27. Lorke, D. E., Hasan, M. Y., Nurulain, S. M., Sheen, R., Kuca, K., Petroianu, G. A.: Entry of two new asymmetric bispyridinium oximes (K-27 and K-48) into the rat brain: comparison with obidoxime. J. Appl. Toxicol., 2007; 27, 482–490.

28. Kuca, K., Patocka, J.: Reactivation of cyclosarin-inhibited rat brain acetylcholinesterase by pyridinium-oximes. J. Enzym. Inhib. Med. Chem., 2004; 19, 19–22.

29. Musilek, K., Holas, O., Kuca K., Jun D., Dohnal, V., Opletalova, V., Dolezal, M.: Synthesis of a novel series of non-symmetrical bispyridinium compounds bearing a xylene linker and evaluation of their reactivation activity against tabun and paraoxon-inhibited acetylcholinesterase. J. Enzym. Inhib. Med. Chem., 2007; 22, 425–432.

Labels
Pharmacy Clinical pharmacology
Login
Forgotten password

Enter the email address that you registered with. We will send you instructions on how to set a new password.

Login

Don‘t have an account?  Create new account

#ADS_BOTTOM_SCRIPTS#