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Maneikyte, J; Bausys, A; Leber, B; Horvath, A; Feldbacher, N; Hoefler, G; Strupas, K; Stiegler, P; Schemmer, P.
Dietary glycine decreases both tumor volume and vascularization in a combined colorectal liver metastasis and chemotherapy model.
Int J Biol Sci. 2019; 15(8):1582-1590 Doi: 10.7150/ijbs.35513 [OPEN ACCESS]
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Führende Autor*innen der Med Uni Graz
Schemmer Peter
Co-Autor*innen der Med Uni Graz
Höfler Gerald
Horvath Angela
Leber Bettina
Stiegler Philipp

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Rationale: Chemotherapy (CTx) with FOLFOX is indicated prior to resection of liver metastases; however, its effect is limited due to chemoresistance and its toxicity prevents from aggressive surgery needed in some cases. Hepatoprotective glycine has been shown to have anti-tumorigenic properties in various cancers. Thus, this study was designed to evaluate the effects of glycine combined with FOLFOX on colorectal liver metastases (CRLM). Methods: The effect of glycine combined with 5-fluorouracil and oxaliplatin was investigated in vitro on colorectal cancer (CC531). Further, Wag/Rij rats with CRLM were treated with 5% dietary glycine ± FOLFOX. µCT liver scan, anti-Ki67, and anti-CD31 were compared. Results: Glycine alone and combined with CTx has no effect on both CC531 viability in vitro and tumor proliferation in vivo; however, glycine significantly decreased tumor volume to about 42-35% of controls in vivo (p<0.05) with a 60% decreased tumor microvascular density (MVD) (p=0.004). Further glycine doesn't counteract anti-tumor properties of CTx. Conclusions: This study nicely demonstrates that glycine inhibits the growth of CRLM and does not decrease CTx effectiveness. Underlying mechanisms most likely include a decreased tumor MVD. Clinical trials are warranted to implement non-toxic hepatoprotective glycine in novel anti-cancer strategies in humans.

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colorectal liver metastasis
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