食物と栄養障害のジャーナル

Clinical Nutrition 2017: Glutathione in parenteral nutrition prevents both the oxidative stress and hypo alveolarization in lungs of newborn guinea pigs- Jean Claude Lavoie- Universite de Montreal

Jean Claude Lavoie

Introduction: Peroxides sullying parenteral nourishment (PN) are related with oxidation of redox capability of glutathione in blood of preterm infants (<30 weeks development) and in lungs of creature model of neonatal PN. These oxidized redox and peroxides are related to bronchopulmonaria dysplasia in preterm infants and actuate loss of alveoli by apoptosis in creatures. Glutathione detoxifies peroxides and standardizes redox potential. In any case, glutathione is low in preterm babies. Glutathione is gotten from liver where methionine is changed in cysteine of which accessibility constrains the glutathione blend. Peroxides from PN hinder the methionine adenosyltransferase, the main compound prompting cysteine. Hence, untimely newborn children have a restricted ability to detoxify peroxides.

Hypothesis: Extension of glutathione in PN compensates for the low hepatic capacity to deftly glutathione, and in this way spares the lung uprightness.

Method: At day 3 of life, through a jugular catheter, guinea pigs (N=55) got PN (dextrose, amino acids, lipids, nutrients, electrolytes) enhanced in glutathione (0, 50, 120, 165, 270, 370, 650 μg GSSG/kg/d). GSSG was utilized instead of GSH in light of the fact that it has a superior steadiness in PN and comparative effectiveness in vivo. A benchmark group (no control, took care of by mouth) filled in as reference. Following 4 days, lungs organ were taken for assurance of GSH, GSSG, redox potential (slim electrophoresis) and alveolarization record (AI) (number of captures between a 1 mm line and histological structures); higher is AI, higher is the quantity of alveoli. Information (mean±sem) from creatures on PN were looked at by ANOVA, p<0.05.

Background: Parenteral nourishment (PN) is debased by peroxides, which initiate oxidative pressure (oxidized redox potential) and hypoalveolarization in lungs of infant creatures. In human untimely babies, PN is related to an oxidized redox potential and to a more noteworthy predominance of bronchopulmonary

dysplasia (BPD). Peroxides are detoxified by glutathione that is inadequate in preterm newborn children. Speculation: Improving glutathione level in untimely babies forestalls BPD advancement brought about by oxidative pressure.

Objectives: Survey portion reaction impact of glutathione included in PN alveolarization record and aspiratory redox capability of glutathione (explicit oxidative pressure marker for peroxides) in infant guinea pigs.

Results: The results of the study were as follows: redox: doses 0-270 = -2091; doses 440-1065 = -2172; p<0.01; control (without manipulation): -2162 mV. GSH: 0-270 = 291; 440-1065 = 301; control = 361 nmol/mg prot. GSSG: 0-270 = 0.820.08; 440-1065 = 0.380.04; p<0.01; control = 0.490.07 nmol/mg prot. Alveoli: 0-200 = 261; 270-1065 = 301; p<0.01; control = 332 count/mm.

There was no distinction in the alveolarization record between bunches accepting portions extending from 0 to 120 μg/kg/d (25.9 ± 0.6 captures/mm) and between those with dosages running somewhere in the range of 165 and 650 μg/kg/d (30.5 ± 0.6 captures/mm). Nonetheless, the contrast between the most minimal (0–120 μg/kg/d) and the most elevated dosages (165–650 μg/kg/d) was profoundly huge (p<0.001). The control AI esteem was 29.4 ± 1.2 captures/mm. Expanding GSSG in PN has permitted a critical (r2=0.47; p<0.001) decrease of redox potential, from oxidized status of - 205 ± 2 in PN without GSSG to - 215 ± 2 mV with the most noteworthy portion (650 μg/kg/d); control = - 222 ± 3 mV. GSSG in PN was additionally connected with a diminishing GSSG values (r2=0.49; p<0.001), from 0.84 ± 0.10 in PN without GSSG to 0.38 ± 0.06 nmol/mg prot with the most noteworthy portion (650 μg/kg/d); control = 0.35 ± 0.07 nmol/mg prot. There was no impact on GSH (mean estimation of 29 ± 1 nmol/mg prot).

Conclusion: Expansion of glutathione into PN forestalls aspiratory oxidative pressure. The portion reaction bend recommends a particular negligible portion of GSSG to keep up the alveolar honesty. Lower portions were wasteful while higher dosages are pointless, as the record of alveolarization arrived at a level with a mean worth like that one saw in the benchmark group. This pre-clinical examination brings fundamental information that will serve for the clinical stage I-II study that we are beginning soon.

Discussion: Expansion of glutathione in PN permits detoxification of peroxides (lower GSSG), forestalling oxidation of redox and loss of alveoli. A clinical report is relied upon to begin soon.