Dexmedetomidine-ketamine combination mitigates pulmonary type-2 cationic amino acid transporter isozymes upregulation in hemorrhagic shock rats

Shih Jen Huang, Pei Shan Tsai, Chun Jen Huang

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Objective: Dexmedetomidine-ketamine combination has been reported to mitigate inducible nitric oxide synthase (iNOS) upregulation in rats with hemorrhagic shock. Type-2 cationic amino acid transporter isozymes, including CAT-2 and CAT-2B, are essential in regulating iNOS activity. We sought to elucidate the effects of dexme-detomidine-ketamine combination on regulating the expression of pulmonary CAT-2 isozymes in rats with hemorrhagic shock. Methods : Forty adult male rats were randomized to one of four groups (10 rats in each group): sham-instrumentation (Sham); sham-instrumentation plus dexmedetomidine-ketamine combination (Sham-D + K); hemorrhagic shock (HS); or hemorrhagic shock plus dexmedetomidine-ketamine combination (HS-D + K). Rats in the HS and HS-D + K groups sustained controlled hemorrhagic shock (mean blood pressure was lowered to 40-45 mmHg by bloodletting for 60 minutes), followed by resuscitation with reinfusion of the shed blood mixed with saline. After close observation for 5 hours, the rats were sacrificed and the expression of CAT-2 isozymes was evaluated. Results : Sham-instrumentation and dexmedetomidine- ketamine combination did not affect CAT-2 isozymes expression, as pulmonary CAT-2 and CAT-2B mRNA concentrations in the Sham and Sham-D + K groups were low. Hemorrhagic shock significantly upregu-lated CAT-2 isozymes expression as pulmonary CAT-2 and CAT-2B mRNA concentrations in the HS group were significantly higher than in the two Sham groups. Pulmonary CAT-2 and CAT-2B mRNA concentrations in the HS-D + K group were significantly lower than in the HS group, indicating that the effects of hemorrhagic shock on upregulating CAT-2 isozymes expression were attenuated by dexmedetomidine-ketamine combination. Conclusion : Dexmedetomidine-ketamine combination mitigates pulmonary CAT-2 isozymes upregulation in rats with hemorrhagic shock.

Original languageEnglish
Pages (from-to)110-116
Number of pages7
JournalActa Anaesthesiologica Taiwanica
Volume48
Issue number3
DOIs
Publication statusPublished - Sep 2010

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Cationic Amino Acid Transporter 2
Dexmedetomidine
Hemorrhagic Shock
Ketamine
Isoenzymes
Up-Regulation
Lung
Nitric Oxide Synthase Type II
Messenger RNA
Bloodletting

Keywords

  • cationic amino acid transporter 2
  • hemorrhage
  • lung
  • rats

ASJC Scopus subject areas

  • Anesthesiology and Pain Medicine

Cite this

Dexmedetomidine-ketamine combination mitigates pulmonary type-2 cationic amino acid transporter isozymes upregulation in hemorrhagic shock rats. / Huang, Shih Jen; Tsai, Pei Shan; Huang, Chun Jen.

In: Acta Anaesthesiologica Taiwanica, Vol. 48, No. 3, 09.2010, p. 110-116.

Research output: Contribution to journalArticle

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abstract = "Objective: Dexmedetomidine-ketamine combination has been reported to mitigate inducible nitric oxide synthase (iNOS) upregulation in rats with hemorrhagic shock. Type-2 cationic amino acid transporter isozymes, including CAT-2 and CAT-2B, are essential in regulating iNOS activity. We sought to elucidate the effects of dexme-detomidine-ketamine combination on regulating the expression of pulmonary CAT-2 isozymes in rats with hemorrhagic shock. Methods : Forty adult male rats were randomized to one of four groups (10 rats in each group): sham-instrumentation (Sham); sham-instrumentation plus dexmedetomidine-ketamine combination (Sham-D + K); hemorrhagic shock (HS); or hemorrhagic shock plus dexmedetomidine-ketamine combination (HS-D + K). Rats in the HS and HS-D + K groups sustained controlled hemorrhagic shock (mean blood pressure was lowered to 40-45 mmHg by bloodletting for 60 minutes), followed by resuscitation with reinfusion of the shed blood mixed with saline. After close observation for 5 hours, the rats were sacrificed and the expression of CAT-2 isozymes was evaluated. Results : Sham-instrumentation and dexmedetomidine- ketamine combination did not affect CAT-2 isozymes expression, as pulmonary CAT-2 and CAT-2B mRNA concentrations in the Sham and Sham-D + K groups were low. Hemorrhagic shock significantly upregu-lated CAT-2 isozymes expression as pulmonary CAT-2 and CAT-2B mRNA concentrations in the HS group were significantly higher than in the two Sham groups. Pulmonary CAT-2 and CAT-2B mRNA concentrations in the HS-D + K group were significantly lower than in the HS group, indicating that the effects of hemorrhagic shock on upregulating CAT-2 isozymes expression were attenuated by dexmedetomidine-ketamine combination. Conclusion : Dexmedetomidine-ketamine combination mitigates pulmonary CAT-2 isozymes upregulation in rats with hemorrhagic shock.",
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AB - Objective: Dexmedetomidine-ketamine combination has been reported to mitigate inducible nitric oxide synthase (iNOS) upregulation in rats with hemorrhagic shock. Type-2 cationic amino acid transporter isozymes, including CAT-2 and CAT-2B, are essential in regulating iNOS activity. We sought to elucidate the effects of dexme-detomidine-ketamine combination on regulating the expression of pulmonary CAT-2 isozymes in rats with hemorrhagic shock. Methods : Forty adult male rats were randomized to one of four groups (10 rats in each group): sham-instrumentation (Sham); sham-instrumentation plus dexmedetomidine-ketamine combination (Sham-D + K); hemorrhagic shock (HS); or hemorrhagic shock plus dexmedetomidine-ketamine combination (HS-D + K). Rats in the HS and HS-D + K groups sustained controlled hemorrhagic shock (mean blood pressure was lowered to 40-45 mmHg by bloodletting for 60 minutes), followed by resuscitation with reinfusion of the shed blood mixed with saline. After close observation for 5 hours, the rats were sacrificed and the expression of CAT-2 isozymes was evaluated. Results : Sham-instrumentation and dexmedetomidine- ketamine combination did not affect CAT-2 isozymes expression, as pulmonary CAT-2 and CAT-2B mRNA concentrations in the Sham and Sham-D + K groups were low. Hemorrhagic shock significantly upregu-lated CAT-2 isozymes expression as pulmonary CAT-2 and CAT-2B mRNA concentrations in the HS group were significantly higher than in the two Sham groups. Pulmonary CAT-2 and CAT-2B mRNA concentrations in the HS-D + K group were significantly lower than in the HS group, indicating that the effects of hemorrhagic shock on upregulating CAT-2 isozymes expression were attenuated by dexmedetomidine-ketamine combination. Conclusion : Dexmedetomidine-ketamine combination mitigates pulmonary CAT-2 isozymes upregulation in rats with hemorrhagic shock.

KW - cationic amino acid transporter 2

KW - hemorrhage

KW - lung

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