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PRACA ORYGINALNA
The influence of single application of paracetamol and/or N-acetylcysteine on rats in subchronic exposition to trichloroethylene vapours. III. Effect on some isoforms of cytochrome P450 in liver
 
Więcej
Ukryj
1
Department of Histology, Medical University of Silesia, Katowice. Head of Department: R. Wiaderkiewicz MD, PhD, associated professor
 
2
Department of Proteomics, Medical University of Silesia, Sosnowiec. Head of Department: Prof. A. Plewka MD PhD
 
3
Department of Toxicology, Medical University, Poznań. Head of Department: Prof. J. Jodynis-Liebert PhD
 
 
Autor do korespondencji
Andrzej Plewka   

Department of Proteomics, Medical University of Silesia, ul. Ostrogórska 30 41-200 Sosnowiec tel./fax +48 32 364-14-40 e-mail: aplewka@sum.edu.pl
 
 
Med Srod. 2012;15(4):24-30
 
SŁOWA KLUCZOWE
STRESZCZENIE
Wstęp:
W przypadku przedawkowania paracetamolu, zdolność wątroby do detoksykacji zostaje wysycona i następuje akumulacja toksycznego metabolitu, jaki jest NAPQI. Główne izoformy CYP, uważane za odpowiedzialne za bioaktywację APAP-u i sprzyjające w ten sposób zatruciom wątrobowym, to CYP2E1, CYP1A2 oraz CYP3A4 a u zwierząt dodatkowo izoformy 2B1/2. Celem pracy było zbadanie wpływu paracetamolu i/lub trichloroetylenu na skład wątrobowych izoform cytochromu P450.

Materiał i metody:
Badania wykonano na szczurach, które traktowano trichloroetylenem, paracetamolem i/lub N-acetylocysteiną. We frakcji mikrosomalnej wątroby oznaczano zawartość trzech izoform cytochromu P450, tj., CYP2E1, CYP2B1/2 oraz CYP1A2.

Wyniki:
Paracetamol lekko stymulował CYP2E1 obniżając równocześnie poziom CYP1A2. Trichloroetylen stymulował CYP2B1/2. N-acetylocysteina miała stymulujący wpływ na wszystkie badane izoformy P450. N-acetylocysteina podawana łącznie z badanymi ksenobiotykami prowadziła do wyraźnych wzrostów CYP.

Wnioski:
N-acetylocysteina wykazywała ochronny wpływ na poziomy badanych izoform cytochromu P450, szczególnie, jeśli została podana zaraz po zaprzestaniu ekspozycji na ksenobiotyki.


Introduction:
In case of overdose of paracetamol the,ability of hepatic biotransformation is saturated and accumulation,of toxic metabolite – NAPQI takes place. Main,CYP isoforms considered to be responsible for bioactivation,of APAP and promoting the same liver intoxication are,CYP2E1, CYP1A2, CYP3A4 and in animals 2B1/2 isoforms additionally. Purpose of this work was examination of paracetamol influence and/or trichloroethylene on the composition of hepatic cytochrome P450 isoforms.

Material and Methods:
Tests were carried out on rats which were treated with trichloroethylene, paracetamol and/or N-acetylcysteine. In the microsomal fraction content of three isoforms of cytochrome P450 i.e. CYP2E1, CYP2B1/2 and CYP1A2 were determined.

Results:
Paracetamol slightly stimulated CYP2B1/2 lowering simultaneously level ofCYP1A2. Trichloroethylene stimulated CYP2B1/2. N-acetylcysteine stimulated all tested P450 isoforms. N-acetylcysteine given together with examinated xenobiotics induced studied P450 isoforms.

Conclusions:
N-acetylcysteine demonstrated a protective effect on studied CYP isoforms especially when was given upon termination of xenobiotics exposure.

 
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