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and Loci Associate with Plasma Osmolality.
Böger CA, Gorski M, McMahon GM, Xu H, Chang YC, van der Most PJ, Navis G, Nolte IM, de Borst MH, Zhang W, Lehne B, Loh M, Tan ST, Boerwinkle E, Grams ME, Sekula P, Li M, Wilmot B, Moon JG, Scheet P, Cucca F, Xiao X, Lyytikäinen LP, Delgado G, Grammer TB, Kleber ME, Sedaghat S, Rivadeneira F, Corre T, Kutalik Z, Bergmann S, Nielson CM, Srikanth P, Teumer A, Müller-Nurasyid M, Brockhaus AC, Pfeufer A, Rathmann W, Peters A, Matsumoto M, de Andrade M, Atkinson EJ, Robinson-Cohen C, de Boer IH, Hwang SJ, Heid IM, Gögele M, Concas MP, Tanaka T, Bandinelli S, Nalls MA, Singleton A, Tajuddin SM, Adeyemo A, Zhou J, Doumatey A, McWeeney S, Murabito J, Franceschini N, Flessner M, Shlipak M, Wilson JG, Chen G, Rotimi CN, Zonderman AB, Evans MK, Ferrucci L, Devuyst O, Pirastu M, Shuldiner A, Hicks AA, Pramstaller PP, Kestenbaum B, Kardia SLR, Turner ST, Study LC, Briske TE, Gieger C, Strauch K, Meisinger C, Meitinger T, Völker U, Nauck M, Völzke H, Vollenweider P, Bochud M, Waeber G, Kähönen M, Lehtimäki T, März W, Dehghan A, Franco OH, Uitterlinden AG, Hofman A, Taylor HA, Chambers JC, Kooner JS, Fox CS, Hitzemann R, Orwoll ES, Pattaro C, Schlessinger D, Köttgen A, Snieder H, Parsa A, Cohen DM
(2017) J Am Soc Nephrol 28: 2311-2321
MeSH Terms: Aged, Continental Population Groups, Female, Genetic Loci, Genome-Wide Association Study, Humans, Male, Middle Aged, Osmolar Concentration, Plasma, Sodium, Sodium-Bicarbonate Symporters, Transcription Factors, Water-Electrolyte Imbalance
Show Abstract · Added September 19, 2017
Disorders of water balance, an excess or deficit of total body water relative to body electrolyte content, are common and ascertained by plasma hypo- or hypernatremia, respectively. We performed a two-stage genome-wide association study meta-analysis on plasma sodium concentration in 45,889 individuals of European descent (stage 1 discovery) and 17,637 additional individuals of European descent (stage 2 replication), and a transethnic meta-analysis of replicated single-nucleotide polymorphisms in 79,506 individuals (63,526 individuals of European descent, 8765 individuals of Asian Indian descent, and 7215 individuals of African descent). In stage 1, we identified eight loci associated with plasma sodium concentration at <5.0 × 10 Of these, rs9980 at replicated in stage 2 meta-analysis (=3.1 × 10), with combined stages 1 and 2 genome-wide significance of =5.6 × 10 Transethnic meta-analysis further supported the association at rs9980 (=5.9 × 10). Additionally, rs16846053 at showed nominally, but not genome-wide, significant association in combined stages 1 and 2 meta-analysis (=6.7 × 10). encodes a ubiquitously expressed transcription factor that coordinates the intracellular response to hypertonic stress but was not previously implicated in the regulation of systemic water balance. encodes a sodium bicarbonate transporter with a brain-restricted expression pattern, and variant rs16846053 affects a putative intronic NFAT5 DNA binding motif. The lead variants for and are expression quantitative trait loci in tissues of the central nervous system and relevant to transcriptional regulation. Thus, genetic variation in and expression and function in the central nervous system may affect the regulation of systemic water balance.
Copyright © 2017 by the American Society of Nephrology.
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Imbalance between HDAC and HAT activities drives aberrant STAT1/MyD88 expression in macrophages from type 1 diabetic mice.
Filgueiras LR, Brandt SL, Ramalho TR, Jancar S, Serezani CH
(2017) J Diabetes Complications 31: 334-339
MeSH Terms: Acetylation, Animals, Bone Marrow Cells, Cells, Cultured, Diabetes Mellitus, Type 1, Enzyme Inhibitors, Epigenesis, Genetic, Gene Expression Regulation, Glucose, Histone Acetyltransferases, Histone Deacetylases, Histones, Macrophages, Macrophages, Peritoneal, Male, Mice, Inbred C57BL, Myeloid Differentiation Factor 88, Osmolar Concentration, Promoter Regions, Genetic, Protein Processing, Post-Translational, STAT1 Transcription Factor, Streptozocin
Show Abstract · Added May 4, 2017
AIMS - To investigate the hypothesis that alteration in histone acetylation/deacetylation triggers aberrant STAT1/MyD88 expression in macrophages from diabetics. Increased STAT1/MyD88 expression is correlated with sterile inflammation in type 1 diabetic (T1D) mice.
METHODS - To induce diabetes, we injected low-doses of streptozotocin in C57BL/6 mice. Peritoneal or bone marrow-differentiated macrophages were cultured in 5mM (low) or 25mM (high glucose). ChIP analysis of macrophages from nondiabetic or diabetic mice was performed to determine acetylation of lysine 9 in histone H3 in MyD88 and STAT1 promoter regions. Macrophages from diabetic mice were treated with the histone acetyltransferase inhibitor anacardic acid (AA), followed by determination of mRNA expression by qPCR.
RESULTS - Increased STAT1 and MyD88 expression in macrophages from diabetic but not naive mice cultured in low glucose persisted for up to 6days. Macrophages from diabetic mice exhibited increased activity of histone acetyltransferases (HAT) and decreased histone deacetylases (HDAC) activity. We detected increased H3K9Ac binding to Stat1/Myd88 promoters in macrophages from T1D mice and AA in vitro treatment reduced STAT1 and MyD88 mRNA expression.
CONCLUSIONS/INTERPRETATION - These results indicate that histone acetylation drives elevated Stat1/Myd88 expression in macrophages from diabetic mice, and this mechanism may be involved in sterile inflammation and diabetes comorbidities.
Copyright © 2016 Elsevier Inc. All rights reserved.
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Vitamin D3 inhibits expression and activities of matrix metalloproteinase-2 and -9 in human uterine fibroid cells.
Halder SK, Osteen KG, Al-Hendy A
(2013) Hum Reprod 28: 2407-16
MeSH Terms: Antineoplastic Agents, Calcitriol, Cell Line, Tumor, Enzyme Precursors, Female, Gene Expression Regulation, Neoplastic, Humans, Leiomyoma, Matrix Metalloproteinase 2, Matrix Metalloproteinase 9, Myometrium, Neoplasm Proteins, Osmolar Concentration, RNA, Messenger, Receptors, Calcitriol, Tissue Inhibitor of Metalloproteinase-1, Tissue Inhibitor of Metalloproteinase-2, Tumor Cells, Cultured, Uterine Neoplasms
Show Abstract · Added May 29, 2014
STUDY QUESTION - Can biologically active vitamin D3 [1,25(OH)₂D3] regulate the expression and activity of matrix metalloproteinases (MMPs) in human uterine fibroid cells?
SUMMARY ANSWER - 1,25(OH)₂D3 effectively reduced the expression and activities of MMP-2 and MMP-9 in cultured human uterine fibroid cells.
WHAT IS KNOWN ALREADY - Uterine fibroids (leiomyoma) express higher levels of MMP activity than adjacent normal myometrium, and this is associated with uterine fibroid pathogenesis. However, it is unknown whether 1,25(OH)₂D3 can regulate the expression and activities of MMPs in human uterine fibroid cells.
STUDY DESIGN, SIZE, DURATION - Surgically removed fresh fibroid tissue was used to generate primary uterine fibroid cells.
PARTICIPANTS/MATERIALS, SETTING, METHODS - An immortalized human uterine fibroid cell line (HuLM) and/or primary human uterine fibroid cells isolated from fresh fibroid tissue were used to examine the expression of several MMPs, tissue inhibitors of metalloproteinases (TIMP) 1 and 2 and the activities of MMP-2 and MMP-9 after 1,25(OH)₂D3 treatment. Real-time PCR and western blots analyses were used to measure mRNA and protein expression of MMPs, respectively. Supernatant cell culture media were analyzed for MMP-2 and MMP-9 activities using a gelatin zymography assay.
MAIN RESULTS AND THE ROLE OF CHANCE - 1-1000 nM 1,25(OH)₂D3 significantly reduced mRNA levels of MMP-2 and MMP-9 in HuLM cells in a concentration-dependent manner (P < 0.5 to P < 0.001). The mRNA levels of MMP-1, MMP-3, MMP-13 and MMP-14 in HuLM cells were also reduced by 1,25(OH)₂D3. 1,25(OH)₂D3 significantly reduced MMP-2 and MMP-9 protein levels in a concentration-dependent manner in both HuLM and primary uterine fibroid cells (P < 0.05 to P < 0.001). Moreover, 1,25(OH)₂D3 increased the mRNA levels of vitamin D receptor (VDR) and TIMP-2 in a concentration-dependent manner in HuLM cells (P < 0.05 to P < 0.01). 1,25(OH)₂D3 also significantly increased protein levels of VDR and TIMP-2 in all cell types tested (P < 0.05 to P < 0.001). Gelatin zymography revealed that pro-MMP-2, active MMP-2 and pro-MMP-9 were down-regulated by 1,25(OH)₂D3 in a concentration-dependent manner; however, the active MMP-9 was undetectable.
LIMITATIONS, REASONS FOR CAUTION - This study was performed using in vitro uterine fibroid cell cultures and the results were extrapolated to in vivo situation of uterine fibroids. Moreover, in this study the interaction of vitamin D3 with other regulators such as steroid hormone receptors was not explored.
WIDER IMPLICATIONS OF THE FINDINGS - This study reveals an important biological function of 1,25(OH)₂D3 in the regulation of expression and activities of MMP-2 and MMP-9. Thus, 1,25(OH)₂D3 might be a potential effective, safe non-surgical treatment option for human uterine fibroids.
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19 MeSH Terms
Immune cells control skin lymphatic electrolyte homeostasis and blood pressure.
Wiig H, Schröder A, Neuhofer W, Jantsch J, Kopp C, Karlsen TV, Boschmann M, Goss J, Bry M, Rakova N, Dahlmann A, Brenner S, Tenstad O, Nurmi H, Mervaala E, Wagner H, Beck FX, Müller DN, Kerjaschki D, Luft FC, Harrison DG, Alitalo K, Titze J
(2013) J Clin Invest 123: 2803-15
MeSH Terms: Animals, Cells, Cultured, Homeostasis, Hyperplasia, Hypertension, Keratinocytes, Lymph, Lymphatic Vessels, Macrophages, Male, Mice, Mice, 129 Strain, Mice, Inbred C57BL, Osmolar Concentration, Rats, Rats, Sprague-Dawley, Skin, Sodium Chloride, Dietary, Transcription Factors, Vascular Endothelial Growth Factor C, Vascular Endothelial Growth Factor Receptor-3, Water-Electrolyte Balance
Show Abstract · Added March 31, 2015
The skin interstitium sequesters excess Na+ and Cl- in salt-sensitive hypertension. Mononuclear phagocyte system (MPS) cells are recruited to the skin, sense the hypertonic electrolyte accumulation in skin, and activate the tonicity-responsive enhancer-binding protein (TONEBP, also known as NFAT5) to initiate expression and secretion of VEGFC, which enhances electrolyte clearance via cutaneous lymph vessels and increases eNOS expression in blood vessels. It is unclear whether this local MPS response to osmotic stress is important to systemic blood pressure control. Herein, we show that deletion of TonEBP in mouse MPS cells prevents the VEGFC response to a high-salt diet (HSD) and increases blood pressure. Additionally, an antibody that blocks the lymph-endothelial VEGFC receptor, VEGFR3, selectively inhibited MPS-driven increases in cutaneous lymphatic capillary density, led to skin Cl- accumulation, and induced salt-sensitive hypertension. Mice overexpressing soluble VEGFR3 in epidermal keratinocytes exhibited hypoplastic cutaneous lymph capillaries and increased Na+, Cl-, and water retention in skin and salt-sensitive hypertension. Further, we found that HSD elevated skin osmolality above plasma levels. These results suggest that the skin contains a hypertonic interstitial fluid compartment in which MPS cells exert homeostatic and blood pressure-regulatory control by local organization of interstitial electrolyte clearance via TONEBP and VEGFC/VEGFR3-mediated modification of cutaneous lymphatic capillary function.
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Plasma Dickkopf1 (DKK1) concentrations negatively associate with atherosclerotic calcified plaque in African-Americans with type 2 diabetes.
Register TC, Hruska KA, Divers J, Bowden DW, Palmer ND, Carr JJ, Wagenknecht LE, Hightower RC, Xu J, Smith SC, Dietzen DJ, Langefeld CD, Freedman BI
(2013) J Clin Endocrinol Metab 98: E60-5
MeSH Terms: Adult, African Americans, Aged, Bone Density, Calcinosis, Cross-Sectional Studies, Diabetes Mellitus, Type 2, Female, Humans, Intercellular Signaling Peptides and Proteins, Male, Middle Aged, Osmolar Concentration, Plaque, Atherosclerotic
Show Abstract · Added February 15, 2014
BACKGROUND - Bone mineral density (BMD) and atherosclerotic arterial calcified plaque (CP) demonstrate inverse relationships through unknown mechanisms. Dickkopf-1 (DKK1) is an endogenous inhibitor of bone formation, and serum DKK1 has been associated with impaired osteoblast activation and susceptibility to bone loss. Plasma DKK1, BMD in the spine, and CP in three arterial beds were assessed in African-Americans (AAs) to determine relationships of serum DKK1 with atherosclerotic vascular calcification.
METHODS - Plasma DKK1, computed tomography-derived trabecular volumetric BMD (vBMD) in thoracic and lumbar vertebrae, and coronary artery, carotid artery, and aortoiliac CP were measured in 450 unrelated AAs with type 2 diabetes. Generalized linear models were fitted to test for associations between DKK1, vBMD, and CP.
RESULTS - Participants were 56% female with mean/SD/median age of 55.4/9.5/55.0 yr, diabetes duration of 10.3/8.2/8.0 yr, plasma DKK1 of 481.6/271.8/417 pg/ml, coronary artery CP mass score of 284/648/13, carotid artery CP mass score of 46/132/0, and aortoiliac CP mass score of 1613/2910/282. Adjusting for age, sex, body mass index, mean arterial blood pressure, smoking, hemoglobin A(1c), and low-density lipoprotein-cholesterol, DKK1 was inversely associated with coronary artery and aortoiliac CP [parameter estimates -0.0011 (P = 0.0137) and -0.0010 (P = 0.0214), respectively], with a trend for carotid artery CP (P = 0.1404). No associations were observed between DKK1 and vBMD in the thoracic or lumbar vertebrae.
CONCLUSIONS - Plasma DKK1 levels were inversely associated with coronary artery and aortoiliac CP, but not vBMD, in this cross-sectional study of AAs with type 2 diabetes. DKK1 may play a role in vascular mineral metabolism in this clinical setting.
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Total body water in elderly adults--assessing hydration status by bioelectrical impedance analysis vs urine osmolality.
Powers JS, Buchowski M, Wang L, Otoo-Boameh A
(2012) J Am Geriatr Soc 60: 388-90
MeSH Terms: Aged, Aged, 80 and over, Body Water, Electric Impedance, Female, Humans, Male, Osmolar Concentration, Urine, Water-Electrolyte Balance
Added December 10, 2013
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Sex differences in the effects of MDMA (ecstasy) on plasma copeptin in healthy subjects.
Simmler LD, Hysek CM, Liechti ME
(2011) J Clin Endocrinol Metab 96: 2844-50
MeSH Terms: Adult, Arginine Vasopressin, Cross-Over Studies, Duloxetine Hydrochloride, Female, Glycopeptides, Humans, Male, N-Methyl-3,4-methylenedioxyamphetamine, Osmolar Concentration, Serotonin Agents, Serotonin Uptake Inhibitors, Sex Characteristics, Thiophenes
Show Abstract · Added August 3, 2013
BACKGROUND - 3,4-Methylenedioxymethamphetamine (MDMA, ecstasy) misuse is associated with hyponatremia particularly in women. Hyponatremia is possibly due to inappropriate secretion of plasma arginine vasopressin (AVP).
OBJECTIVE - To assess whether MDMA increases plasma AVP and copeptin in healthy male and female subjects and whether effects depend on MDMA-induced release of serotonin and norepinephrine. Copeptin, the C-terminal part of the AVP precursor preprovasopressin, is cosecreted with AVP and can be determined more reliably.
METHODS - We used a randomized placebo-controlled crossover design. Plasma and urine osmolalities as well as AVP and copeptin levels were measured in 16 healthy subjects (eight female, eight male) at baseline and after MDMA (125 mg) administration. In addition, we tested whether effects of MDMA on AVP and copeptin secretion can be prevented by pretreatment with the serotonin and norepinephrine transporter inhibitor duloxetine (120 mg), which blocks MDMA-induced transporter-mediated release of serotonin and norepinephrine.
RESULTS - MDMA significantly elevated plasma copeptin levels at 60 min and at 120 min compared with placebo in women but not in men. The copeptin response to MDMA in women was prevented by duloxetine. MDMA also nonsignificantly increased plasma AVP levels in women, and the effect was prevented by duloxetine. Although subjects drank more water after MDMA compared with placebo administration, MDMA tended to increase urine sodium levels and urine osmolality compared with placebo, indicating increased renal water retention.
CONCLUSION - MDMA increased plasma copeptin, a marker for AVP secretion, in women but not in men. This sex difference in MDMA-induced AVP secretion may explain why hyponatremia is typically reported in female ecstasy users. The copeptin response to MDMA is likely mediated via MDMA-induced release of serotonin and/or norepinephrine because it was prevented by duloxetine, which blocks the interaction of MDMA with the serotonergic and noradrenergic system.
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14 MeSH Terms
Membrane-type 4 matrix metalloproteinase (MT4-MMP) modulates water homeostasis in mice.
Srichai MB, Colleta H, Gewin L, Matrisian L, Abel TW, Koshikawa N, Seiki M, Pozzi A, Harris RC, Zent R
(2011) PLoS One 6: e17099
MeSH Terms: Animals, Gene Deletion, Gene Expression Regulation, Enzymologic, Homeostasis, Hypothalamus, Anterior, Kidney Medulla, Matrix Metalloproteinase 17, Mice, Osmolar Concentration, Water
Show Abstract · Added February 25, 2014
MT4-MMP is a membrane-type metalloproteinase (MMP) anchored to the membrane by a glycosyl-phosphatidylinositol (GPI) motif. GPI-type MT-MMPs (MT4- and MT6-MMP) are related to other MT-MMPs, but their physiological substrates and functions in vivo have yet to be identified. In this manuscript we show that MT4-MMP is expressed early in kidney development, as well as in the adult kidney, where the highest levels of expression are found in the papilla. MT4-MMP null mice had minimal renal developmental abnormalities, with a minor branching morphogenesis defect in early embryonic kidney development and slightly dysmorphic collecting ducts in adult mice. Interestingly, MT4-MMP null mice had higher baseline urine osmolarities relative to wild type controls, but these animals were able to concentrate and dilute their urines normally. However, MT4-MMP-null mice had decreased daily water intake and daily urine output, consistent with primary hypodipsia. MT4-MMP was shown to be expressed in areas of the hypothalamus considered important for regulating thirst. Thus, our results show that although MT4-MMP is expressed in the kidney, this metalloproteinase does not play a major role in renal development or function; however it does appear to modify the neural stimuli that modulate thirst.
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Inter-individual variation in flavin-containing monooxygenase 3 in livers from Japanese: correlation with hepatic transcription factors.
Nagashima S, Shimizu M, Yano H, Murayama N, Kumai T, Kobayashi S, Guengerich FP, Yamazaki H
(2009) Drug Metab Pharmacokinet 24: 218-25
MeSH Terms: Asian Continental Ancestry Group, Benzodiazepines, Benzydamine, CCAAT-Binding Factor, Genetic Variation, Hepatocyte Nuclear Factor 4, Humans, Hydrogen-Ion Concentration, Microsomes, Liver, Olanzapine, Osmolar Concentration, Oxygenases, RNA, Messenger, S-Nitroso-N-Acetylpenicillamine, Sulfides
Show Abstract · Added March 26, 2014
Human flavin-containing monooxygenase 3 (FMO3)-mediated microsomal oxygenation activity, levels of FMO3 protein and FMO3 mRNA and modifications were investigated in Japanese livers genotyped for the FMO3 gene. Significant correlations were observed for benzydamine N-oxygenation or methyl p-tolyl sulfide S-oxygenation activity (in the range of approximately 20- to approximately 40-fold) and FMO3 levels determined immunochemically in liver microsomes (r(2)=0.73-0.75, p<0.0001, n=16). Preincubation with the reducing agent ascorbate revealed that FMO3 activity in some liver samples is suppressed. Microsomal FMO3 protein content (approximately 40-fold) was correlated with FMO3 mRNA levels (r(2)=0.55, p=0.0010, n=16), but FMO3 haplotypes did not affect FMO3 mRNA expression (approximately 100-fold) under the conditions used. FMO3 mRNA levels were multivariately correlated with trans-acting factors, i.e. hepatic nuclear factor 4 (HNF-4) mRNA and nuclear factor Y box-binding protein (NF-Y) mRNA (r(2)=0.31, p=0.0017, n=37). These results suggest that considerable individual differences in FMO3 levels may exist in Japanese livers. The liver-enriched transcription factor HNF-4 appears to be a determinant of FMO3 expression in livers, as well as the ubiquitous factor NF-Y.
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Ethnic and genetic determinants of cardiovascular response to the selective alpha 2-adrenoceptor agonist dexmedetomidine.
Kurnik D, Muszkat M, Sofowora GG, Friedman EA, Dupont WD, Scheinin M, Wood AJ, Stein CM
(2008) Hypertension 51: 406-11
MeSH Terms: Adrenergic alpha-2 Receptor Agonists, Adrenergic alpha-Agonists, Adult, African Continental Ancestry Group, Blood Pressure, Cardiovascular System, Cytosine, Dexmedetomidine, European Continental Ancestry Group, Female, Genetic Variation, Genotype, Heterotrimeric GTP-Binding Proteins, Humans, Male, Norepinephrine, Osmolar Concentration, Receptors, Adrenergic, alpha-2, Sequence Deletion, Single-Blind Method, Thymine
Show Abstract · Added December 10, 2013
The alpha(2)-adrenoceptor agonist clonidine reduces blood pressure more effectively in White than Black Americans despite similar degrees of sympatholysis. Functional genetic variation in receptor signaling mechanisms, for example in the beta 3 G-protein subunit (GNB3 C825T) and in the alpha(2C)-adrenoceptor subtype (ADRA2C del322-325), may affect drug responses. We examined the hypothesis that there are ethnic differences in the responses to the highly selective alpha(2)-agonist, dexmedetomidine, and that these genetic variants contribute to interindividual variability in drug responses. In a placebo-controlled, single-masked study, 73 healthy subjects (37 whites and 36 blacks) received 3 placebo infusions and then 3 incremental doses of dexmedetomidine (cumulative dose, 0.4 microg/kg), each separated by 30 minutes. Blood pressure, heart rate, and plasma catecholamine concentrations were determined after each infusion. We measured dexmedetomidine concentrations after the last infusion and determined ADRA2C del322-325 and GNB3 C825T genotypes. Dexmedetomidine lowered blood pressure and plasma catecholamine concentrations significantly (all P<0.001). There was substantial interindividual variability in the reduction of systolic blood pressure (range, 1 to 34 mm Hg) and plasma norepinephrine concentrations (range, 24 to 424 pg/mL). However, there were no differences between black and white subjects in dexmedetomidine responses (P>0.16 for all outcomes) before or after adjustment for covariates. Neither ADRA2C del322-325 nor GNB3 C825T genotypes affected the responses to dexmedetomidine (all P>0.66). There is large interindividual variability in response to the selective alpha(2)-AR agonist dexmedetomidine, and neither ethnicity nor ADRA2C and GNB3 genotypes contribute to it. Further studies to identify determinants of alpha(2)-AR-mediated responses will be of interest.
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21 MeSH Terms