A study of the influence of newly synthesized acyclonucleosides and 1,2,3,4-tetrahydroisoquinoline derivatives on deoxythymidine and deoxycytidine kinase activities in human neurofibrosarcoma and ovarian cancer

• Autorzy: Modrzejewska H. , Brzezinska E. , Draminski M. , Zgit-Wroblewska A. , Krzykowska K. , Rozponczyk E. , Greger J.
• Języki publikacji: EN

Abstrakty

EN

The influence of nine newly synthesized uracil acyclonucleosides, and 36 derivatives of 1,2,3,4-tetrahydroisoquinoline on the activity of enzymes catalysing dTMP and dGMP synthesis, on the content of dTTP and dGTP in acid soluble fraction and on the incorporation of [14C]dThd and [14C ]dGuo into DNA in tumour homogenates was studied. The influence of the compounds was studied in the cytosol from intraoperatively excised human tumours — neurofibrosarcoma and ovarian cancer. It was shown that dTMP and dGMP synthesis is inhibited competitively by 34.1±4.0% in both types of tumours by 0.2 mM 1-N-(3'-hydroxypropyl)-6-methyluracil (1) and 0.2 mM 1-N-(3'-hydroxypropyl)- 5,6- tetramethyleneuracil (2). The mentioned acyclonucleosides reduced the content of dTTP and dGTP in the acid soluble fraction of tumours (59.7±3.1% of control). 1-(4-chlorophenyl)-6,7-dihydroxy- 1,2,3,4-tetrahydroisoquinoline (3), 1-(2,3-dichlorophenyl)-6,7-dihydroxy 1,2,3,4-tetrahydroisoquinoline (4) and 1-(3-methoxyphenyl)-6,7-dihydroxy 1,2,3,4-tetrahydroisoquinoline (5) at 0.2 mM concentration caused a mixed type inhibition of the synthesis of dTMP and dGMP by, on average, 33.2±4.4%, and reduced the content of dTTP and dGTP in the acid soluble fraction (52.6±3.7% of control) but were active only in the cytosol of neurofibrosarcoma. While acyclonucleosides undergo phosphorylation in the cytosol by cellular kinases, with their triphosphates being active acyclonucleoside metabolites, active 1,3,4,5-tetrahydroisoquinoline derivatives (compounds not containing a deoxyribose moiety), cannot be phosphorylated. ACN and THI derivatives which inhibit dThd and dCyd kinase activities, inhibit also the incorporation of [14C]dThd and [14C]dGuo (ACN — 50.2±2.7%, THI — 53.4±3.9% of incorporation inhibition) into tumour DNA. The obtained results point to the mechanism of uracil acyclonucleosides and 1,2,3,4-tetrahydroisoquinoline biological activity consisting in inhibiting the synthesis of DNA components.

Słowa kluczowe

EN

man; neurofibrosarcoma; deoxycytidine kinase; enzyme activity; ovarian cancer; deoxythymidine; 1,2,3,4-tetrahydroisoquinoline

• Wydawca: -
• Czasopismo: Acta Biochimica Polonica
• Rocznik: 2003
• Tom: 50
• Numer: 4
• Opis fizyczny: p.1175-1185,fig.,ref.

Twórcy

autor

Modrzejewska H.

• Medical University of Lodz, Mazowiecka 6-8, 92-215 Lodz, Poland

autor

Brzezinska E.

autor

Draminski M.

autor

Zgit-Wroblewska A.

autor

Krzykowska K.

autor

Rozponczyk E.

autor

Greger J.

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