Bioreactivity and biocompatibility of a vitamin E-modified multi-layer hemodialysis filter View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

1998-08

AUTHORS

F Galli, S Rovidati, L Chiarantini, G Campus, F Canestrari, U Buoncristiani

ABSTRACT

BACKGROUND: The present study was designed to test the biocompatibility of a new vitamin E-modified multi-layer membrane (CL-E filter), as well as its ability to protect against oxygen free radicals during hemodialysis (HD). METHODS: We investigated, both in vitro and in vivo, the bioreactivity of the filter with respect to the blood antioxidants and its ability to prevent lipoperoxidation. The effects on the leukocyte respiratory burst were also studied. Cuprammonium rayon was used as a comparison material (CL-S filter). RESULTS: The in vitro results demonstrated that, under controlled conditions, CL-E is able to preserve blood antioxidants, and particularly vitamin E, from the spontaneous consumption observed in the incubation with CL-S filters and in control incubations. In accordance with this observation, the rate of the oxidative demolition of lipids either in plasma and red blood cells (RBC) or from rat brain homogenate decreased after the exposure to CL-E filters in comparison with the CL-S filter. Moreover, in the absence of any significant cytotoxic effects due to both the types of material studied, the production of oxygen free radicals and nitric oxide (NO) by leukocytes was higher after their in vitro exposure to CL-S, but was quite similar to that of the control leukocytes after exposure to CL-E. In vivo, a one-month treatment with the CL-E filter increased plasma vitamin E by 84.3% with respect to treatment with CL-S; this gain slightly decreased to 68.9% when CL-E treatment was prolonged to three months. In the RBC, vitamin E was found to have increased by 76.7% and 113.4% at one and three months, respectively. Plasma glutathione (GSH) levels determined at three months were significantly increased from 0.10 +/- 0.02 to 0.33 +/- 0.12 mumol/ml, while the erythrocyte GSH was only slightly increased. The leukocyte function estimated as responsiveness to soluble chemical stimuli in CL-S-treated patients was significantly improved both qualitatively and quantitatively after CL-E treatment. The presence of an increased number of mononuclear cells undergoing programmed cell death (apoptosis) in CL-S-treated patients (18.8 +/- 1.7% vs. a control value of 6.5 +/- 2.3%) as well as the apoptogenic effect of their plasma in vitro on U937 cells was significantly corrected after CL-E treatment (mean decrease in apoptotic mononuclear cells at 24 hours of culture, 25.5% and 27.1% at 1 and 3 months, respectively). The anti-apoptogenic effect of CL-E treatment showed a close dependence on the increase in vitamin E in the blood cell compartment. CONCLUSIONS: This study suggests that this vitamin E-modified membrane can be considered a highly biocompatible material, the antioxidant properties of which can exert a site-specific and timely scavenging function against oxygen free radicals in synergy with a hypostimulatory action on the PMN respiratory burst. More... »

PAGES

580-589

Identifiers

URI

http://scigraph.springernature.com/pub.10.1046/j.1523-1755.1998.00021.x

DOI

http://dx.doi.org/10.1046/j.1523-1755.1998.00021.x

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1034790857

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/9690226


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63 schema:description BACKGROUND: The present study was designed to test the biocompatibility of a new vitamin E-modified multi-layer membrane (CL-E filter), as well as its ability to protect against oxygen free radicals during hemodialysis (HD). METHODS: We investigated, both in vitro and in vivo, the bioreactivity of the filter with respect to the blood antioxidants and its ability to prevent lipoperoxidation. The effects on the leukocyte respiratory burst were also studied. Cuprammonium rayon was used as a comparison material (CL-S filter). RESULTS: The in vitro results demonstrated that, under controlled conditions, CL-E is able to preserve blood antioxidants, and particularly vitamin E, from the spontaneous consumption observed in the incubation with CL-S filters and in control incubations. In accordance with this observation, the rate of the oxidative demolition of lipids either in plasma and red blood cells (RBC) or from rat brain homogenate decreased after the exposure to CL-E filters in comparison with the CL-S filter. Moreover, in the absence of any significant cytotoxic effects due to both the types of material studied, the production of oxygen free radicals and nitric oxide (NO) by leukocytes was higher after their in vitro exposure to CL-S, but was quite similar to that of the control leukocytes after exposure to CL-E. In vivo, a one-month treatment with the CL-E filter increased plasma vitamin E by 84.3% with respect to treatment with CL-S; this gain slightly decreased to 68.9% when CL-E treatment was prolonged to three months. In the RBC, vitamin E was found to have increased by 76.7% and 113.4% at one and three months, respectively. Plasma glutathione (GSH) levels determined at three months were significantly increased from 0.10 +/- 0.02 to 0.33 +/- 0.12 mumol/ml, while the erythrocyte GSH was only slightly increased. The leukocyte function estimated as responsiveness to soluble chemical stimuli in CL-S-treated patients was significantly improved both qualitatively and quantitatively after CL-E treatment. The presence of an increased number of mononuclear cells undergoing programmed cell death (apoptosis) in CL-S-treated patients (18.8 +/- 1.7% vs. a control value of 6.5 +/- 2.3%) as well as the apoptogenic effect of their plasma in vitro on U937 cells was significantly corrected after CL-E treatment (mean decrease in apoptotic mononuclear cells at 24 hours of culture, 25.5% and 27.1% at 1 and 3 months, respectively). The anti-apoptogenic effect of CL-E treatment showed a close dependence on the increase in vitamin E in the blood cell compartment. CONCLUSIONS: This study suggests that this vitamin E-modified membrane can be considered a highly biocompatible material, the antioxidant properties of which can exert a site-specific and timely scavenging function against oxygen free radicals in synergy with a hypostimulatory action on the PMN respiratory burst.
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