Abstract | BACKGROUND:
Malignant hyperthermia susceptibility (MHS) is diagnosed by an invasive in vitro caffeine- halothane contracture test (CHCT) carried out on biopsied skeletal muscle tissue. We are presenting a novel blood test approach for malignant hyperthermia testing in a swine model. Our main aim was to determine whether adenosine production from lymphocytes after 4-chloro-m-cresol (4CmC) stimulation distinguishes homozygous swine carrying the Arg615Cys mutation in the ryanodine receptor type 1 ( RyR1) gene (MHS swine) from normal swine. METHODS: Lymphocytes were isolated from arterial blood (40 ml) obtained from MHS (n = 7) and normal (n = 7) swine. Cells were suspended in Hank's balanced salt solution and treated with 4CmC (0-10 mm) at 37°C in the presence of adenosine deaminase inhibitor. After termination and purification of samples, aliquots (50 μl) were assayed for adenosine content using high performance liquid chromatography. RESULTS: Baseline adenosine levels before stimulating lymphocytes with 4CmC were 0.025 ± 0.004 and 0.041 ± 0.006 μm (mean ± SEM) in lymphocytes from normal and MHS swine, respectively (P = 0.125). Maximum responses were achieved at 1 mm 4CmC for both cell-line groups. Adenosine levels after stimulation with 4CmC (1 mm) were 0.185 ± 0.009 and 0.397 ± 0.038 μm in lymphocytes from normal and MHS swine, respectively (P = 0.0035). There was no overlap between adenosine levels in stimulated lymphocytes from MHS and normal swine. CONCLUSION: 4CmC stimulation of porcine lymphocytes induces increased adenosine formation in MHS cells relative to those from normal swine; evaluation of adenosine formation in response to RyR1 agonists in human lymphocytes is needed.
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Authors | Saiid Bina, John Capacchione, Sheila Muldoon, Munkhuu Bayarsaikhan, Rolf Bunger |
Journal | Anesthesiology
(Anesthesiology)
Vol. 113
Issue 4
Pg. 917-24
(Oct 2010)
ISSN: 1528-1175 [Electronic] United States |
PMID | 20823761
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't, Research Support, U.S. Gov't, Non-P.H.S.)
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Chemical References |
- Adenosine Deaminase Inhibitors
- Enzyme Inhibitors
- Imidazoles
- Muscle Relaxants, Central
- Oxazoles
- Ryanodine Receptor Calcium Release Channel
- Uncoupling Agents
- Inosine
- azumolene
- Adenosine Triphosphate
- Magnesium
- Adenosine
- Calcium
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Topics |
- Adenosine
(metabolism)
- Adenosine Deaminase Inhibitors
- Adenosine Triphosphate
(metabolism)
- Animals
- Calcium
(metabolism, pharmacology)
- Chromatography, High Pressure Liquid
- Disease Susceptibility
- Enzyme Inhibitors
(pharmacology)
- Imidazoles
(pharmacology)
- Inosine
(metabolism)
- Lymphocytes
(physiology)
- Magnesium
(pharmacology)
- Malignant Hyperthermia
(diagnosis)
- Muscle Relaxants, Central
(pharmacology)
- Oxazoles
(pharmacology)
- Oxidative Phosphorylation
(drug effects)
- Pilot Projects
- Ryanodine Receptor Calcium Release Channel
(physiology)
- Sarcoplasmic Reticulum
(drug effects)
- Swine
- Uncoupling Agents
(pharmacology)
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