GST isoenzymes in matched normal and neoplastic breast tissue
Yükleniyor...
Tarih
2011
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Aepress Sro
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
The potential to metabolize endogenous and exogenous substances may influence breast cancer development and tumor growth. Therefore we investigated GST activity and the protein expression of glutathione S-transferases (GSTs) isoenzymes known to be involved in the metabolism of endogenous and exogenous carcinogens in breast cancer tissue to obtain new information on their possible role in tumor progression. The interindividual variation in the conjugation of 1-chloro-2,4-dinitrobenzene (CDNB) and of 1,2-epoxy-3-(p-nitrophenoxy) propane (EPNP) with glutathione (GSH) by cytosolic glutathione S-transferases (GSTs) were investigated in human breast matched normal and tumor samples. The GSTA, GSTM, GSTP and GSTT isoenzymes from the crude extracts of matched breast normal and tumor tissues in terms of their immunological properties using western blotting were compared. In most of the samples, the GST activities were higher in the tumor than in the normal cytosolic fractions against both CDNB and EPNP. In the western blotting analysis, it was proved statistically that in normal and tumor epithelial cells, there was difference between GST pi and theta isoenzymes expressions (p<0.05), but no difference between the staining scores of GST mu and alpha isoenzymes (p>0.05). In normal epithelium there was a stronger GST theta expression than in invasive tumor tissues (p=0.013). However, the stronger GST pi expression was observed in tumor epithelium than in normal epithelium in human breast cancers (p=0.000). We found the GSTP protein level and GST activities were higher in the breast tumor than in the normal cytosolic fractions against both CDNB and EPNP, thus implicating a certain biological importance.
Açıklama
Kilic, Murat/0000-0002-1377-2021
Anahtar Kelimeler
Breast cancer, glutathione S-transferases, theta, alpha, mu and pi classes of GSTs, western blotting
Kaynak
Neoplasma
WoS Q Değeri
Q3
Scopus Q Değeri
Q2
Cilt
58
Sayı
4
Künye
Oguztuzun, S., Abu-Hijleh, A., Coban, T., Bulbul, D., Kilic, M., Iscan, M., & Iscan, M. (2011). GST isoenzymes in matched normal and neoplastic breast tissue. Neoplasma, 58(4), 304–310.
