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• W2039251461 abstract "Resuscitation with racemic lactated Ringer’s solution (containing equal amounts of D and L isomers of lactate) has been shown to induce pulmonary apoptosis. Substitution of DL-isomer lactate with ketone bodies (β-hydroxybutyrate, BHB), sodium pyruvate, or L-isomer of lactate decrease this injury without changing the energy status of the tissues or the expression of apoptotic genes. These modified solutions however alter the function of apoptotic proteins through an unknown mechanism. We postulated that DL-LR induces apoptosis by restricting the phosphorylation of key apoptotic proteins. Methods: Male Sprague Dawley rats (n = 30, 5/group) were subjected to a three stage, volume-controlled hemorrhage and randomized to the following groups. 1) No hemorrhage (Sham); 2) Hemorrhage and no resuscitation (NR); 3) Resuscitation with 3× shed blood volume of racemic LR (DL-LR); 4) Resuscitation with 3× shed blood volume of LR containing only the L-isomer of lactate (L-LR); 5) Resuscitation with 3× shed blood volume of pyruvate Ringer’s (PR); 6) Resuscitation with 3× shed blood volume of ketone Ringer’s (KR). The modified Ringer’s solutions were identical to racemic LR except for equimolar substitution of DL-lactate for L-lactate, pyruvate and BHB respectively. Lung tissue was obtained 2 hours later and subjected to Western Blotting. The levels of Akt, Bad, and eNOS (total and phosphorylated) proteins were measured. Finally, the expression of gene coding for protein 14–3-3 was measured using RT-PCR. Results: Resuscitation with DL-LR caused a significant (p < 0.05) increase in the total Bad and a decrease in phosphorylated Bad protein expression in the lung. It also caused an increase in the phosphorylated Akt levels and a decrease in gene coding for protein 14–3-3. These changes were consistent with signaling imbalances that favor apoptosis. Modified LR solutions, on the other hand, did not cause these alterations. Phosphorylation pattern of eNOS supported the involvement of PI3K/Akt pathway in this process. Conclusion: Racemic lactate plays a role in the induction of pulmonary apoptosis by restricting phosphorylation of Bad and eNOS proteins." @default.
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• W2039251461 date "2004-08-01" @default.
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• W2039251461 title "D-Lactate Increases Pulmonary Apoptosis by Restricting Phosphorylation of Bad and eNOS in a Rat Model of Hemorrhagic Shock" @default.
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• W2039251461 doi "https://doi.org/10.1097/01.ta.0000133841.95455.73" @default.
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