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  • Glutathione transferase-A2 S112T polymorphism predicts survival, transplant-related mortality, busulfan and bilirubin blood levels after allogeneic stem cell transplantation.

Glutathione transferase-A2 S112T polymorphism predicts survival, transplant-related mortality, busulfan and bilirubin blood levels after allogeneic stem cell transplantation.

Haematologica (2013-09-24)
Francesca Bonifazi, Gianluca Storci, Giuseppe Bandini, Elena Marasco, Elisa Dan, Elena Zani, Fiorenzo Albani, Sara Bertoni, Andrea Bontadini, Sabrina De Carolis, Maria Rosaria Sapienza, Simonetta Rizzi, Maria Rosa Motta, Martina Ferioli, Paolo Garagnani, Michele Cavo, Vilma Mantovani, Massimiliano Bonafè
ABSTRACT

Busulfan liver metabolism depends on glutathione, a crucial mediator of cellular and systemic stress. Here we investigated 40 polymorphisms at 27 loci involved in hepatic glutathione homeostasis, with the aim of testing their impact on the clinical outcome of 185 busulfan-conditioned allogeneic transplants. GSTA2 S112T serine allele homozygosity is an independent prognostic factor for poorer survival (RR=2.388), for increased any time- and 100-day transplant-related mortality (RR=4.912 and RR=5.185, respectively). The genotype also predicts a wider busulfan area under the concentration-time curve (1214.36 ± 570.06 vs. 838.10 ± 282.40 mMol*min) and higher post-transplant bilirubin serum levels (3.280 ± 0.422 vs. 1.874+0.197 mg/dL). In vitro, busulfan elicits pro-inflammatory activation (increased NF-KappaB activity and interleukin-8 expression) in human hepatoma cells. At the same time, the drug down-regulates a variety of genes involved in bilirubin liver clearance: constitutive androstane receptor, multidrug resistance-associated protein, solute carrier organic anion transporters, and even GSTA2. It is worthy of note that GSTA2 also acts as an intra-hepatic bilirubin binding protein. These data underline the prognostic value of GSTA2 genetic variability in busulfan-conditioned allotransplants and suggest a patho-physiological model in which busulfan-induced inflammation leads to the impairment of post-transplant bilirubin metabolism.

MATERIALS
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Brand
Product Description

Sigma-Aldrich
GST A2-2, Recombinant Human