Research Topics
Species | Robert H AllenSummaryAffiliation: University of Colorado Health Sciences Center Country: USA Publications
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Publications
Cigarette smoke extract increases S-adenosylmethionine and cystathionine in human lung epithelial-like (A549) cellsMihalis I Panayiotidis
Department of Pediatrics, National Jewish Medical and Research Center, 1400 Jackson Street, Denver, CO 80206, USA
Chem Biol Interact 147:87-97. 2004..The transsulfuration pathway was likely activated by CSE since cystathionine increased, potentially contributing to the increased total intracellular GSH content...- Metabolic phenotype of methylmalonic acidemia in mice and humans: the role of skeletal muscleRandy J Chandler
Genetic Diseases Research Branch, National Human Genome Research Institute, National Institutes of Health, Bethesda, MD 20892, USA
BMC Med Genet 8:64. 2007..Current treatment regimens rely on dietary management and, in severely affected patients, liver or combined liver-kidney transplantation. For undetermined reasons, transplantation does not correct the biochemical phenotype... - Identification and quantitation of cobalamin and cobalamin analogues in human fecesRobert H Allen
Division of Hematology, Department of Medicine, University of Colorado Health Sciences Center, Denver, CO 80262, USA
Am J Clin Nutr 87:1324-35. 2008..Cobalamin (vitamin B-12) and cobalamin analogues are present in human feces, but a complete identification has not been established, and the amounts present have not been determined... - Elevated serum S-adenosylhomocysteine in cobalamin-deficient elderly and response to treatmentSally P Stabler
Department of Medicine, University of Colorado Health Sciences Center, Denver, CO, USA
Am J Clin Nutr 84:1422-9. 2006..S-Adenosylmethionine (SAM)-dependent methylation reactions produce S-adenosylhomocysteine (SAH), the precursor of homocysteine, which has been associated with adverse events when it is elevated... - Activation of a novel isoform of methionine adenosyl transferase 2A and increased S-adenosylmethionine turnover in lung epithelial cells exposed to hyperoxiaMihalis I Panayiotidis
Department of Pediatrics, National Jewish Medical and Research Center, 1400 Jackson Street, Denver, CO 80206, USA
Free Radic Biol Med 40:348-58. 2006..These results indicate activation of MAT 2A and the transmethylation pathway in the metabolic response to hyperoxia in lung epithelium... - Vitamin B12 deficiency as a worldwide problemSally P Stabler
Division of Hematology, Department of Medicine, University of Colorado Health Sciences Center, Denver, Colorado 80262, USA
Annu Rev Nutr 24:299-326. 2004..Areas for research include intermittent vitamin B12 supplement dosing and better measurements of the bioavailability of B12 in fermented vegetarian foods and algae... - Maternal Mthfd1 disruption impairs fetal growth but does not cause neural tube defects in miceAnna E Beaudin
Division of Nutritional Sciences, Cornell University, Ithaca, NY, USA
Am J Clin Nutr 95:882-91. 2012..A polymorphism in MTHFD1 (1958G?A) impairs enzymatic activity and is associated with increased risk of adverse pregnancy outcomes, but the mechanisms are unknown... - Quantification of serum and urinary S-adenosylmethionine and S-adenosylhomocysteine by stable-isotope-dilution liquid chromatography-mass spectrometrySally P Stabler
Division of Hematology, Department of Medicine, University of Colorado Health Sciences Center, Denver, CO 80262, USA
Clin Chem 50:365-72. 2004.... - High homocysteine and thrombosis without connective tissue disorders are associated with a novel class of cystathionine beta-synthase (CBS) mutationsKenneth N Maclean
Department of Pediatrics, University of Colorado School of Medicine, Denver, Colorado, USA
Hum Mutat 19:641-55. 2002.... - Cystathionine beta-synthase is coordinately regulated with proliferation through a redox-sensitive mechanism in cultured human cells and Saccharomyces cerevisiaeKenneth N Maclean
Department of Pediatrics, University of Colorado School of Medicine, Denver, Colorado 80262, USA
J Cell Physiol 192:81-92. 2002..Our data indicates that screening compounds for the ability to affect transsulfuration in cultured cell models must take proliferation status into account to avoid masking regulatory interactions that may be of significance in vivo... - Methyl balance and transmethylation fluxes in humansS Harvey Mudd
Laboratory of Molecular Biology, National Institute of Mental Health, Bethesda, MD 20892, USA
Am J Clin Nutr 85:19-25. 2007.... - Evaluation of nutritional and genetic determinants of total homocysteine, methylmalonic acid and S-adenosylmethionine/S-adenosylhomocysteine values in Brazilian childbearing-age womenPatricia R Barbosa
Department of Clinical Chemistry and Toxicology, School of Pharmaceutical Sciences, University of Sao Paulo, Brazil
Clin Chim Acta 388:139-47. 2008..We investigated the nutritional and genetic determinants for total homocysteine (tHcy), methylmalonic acid (MMA) and SAM/SAH in healthy Brazilian childbearing-age women... - Age-related hearing loss, methylmalonic acid, and vitamin B12 status in older adultsSohyun Park
Department of Foods and Nutrition, The University of Georgia, Athens, GA, USA
J Nutr Elder 25:105-20. 2006..Thus, elevated MMA concentration may be associated with hearing loss in older adults. However, short-term B12 supplementation was unrelated to improvements in hearing status in B12-deficient individuals... - Hyperhomocysteinemia and vitamin B-12 deficiency in elderly using Title IIIc nutrition servicesMary Ann Johnson
Department of Foods and Nutrition, University of Georgia, Athens, USA
Am J Clin Nutr 77:211-20. 2003..042). High-dose oral B-12 therapy lowered mean MMA and tHcy by 49% and 32%, respectively. CONCLUSION: Vitamin B-12 deficiency was prevalent and was associated with poor cognition, anemia, and hyperhomocysteinemia... - Low ratio of S-adenosylmethionine to S-adenosylhomocysteine is associated with vitamin deficiency in Brazilian pregnant women and newbornsElvira M Guerra-Shinohara
Departamento de Analises Clinicas e Toxicologicas, Faculdade de Ciências Farmacêuticas da Universidade de São Paulo, Sao Paulo, Brazil
Am J Clin Nutr 80:1312-21. 2004..The effect of low maternal cobalamin concentrations on transmethylation metabolism in pregnant women and their newborns is unknown... - Elevated serum S-adenosylhomocysteine in cobalamin-deficient megaloblastic anemiaElvira M Guerra Shinohara
Department of Clinical and Toxicological Analysis, Pharmaceutical School, University of Sao Paulo, Sao Paulo 05508 900, Brazil
Metabolism 56:339-47. 2007..In conclusion, serum SAH is elevated in cobalamin-deficient subjects with megaloblastic anemia and corrects with parenteral cobalamin therapy... - Zinc, gravida, infection, and iron, but not vitamin B-12 or folate status, predict hemoglobin during pregnancy in Southern EthiopiaRosalind S Gibson
Department of Human Nutrition, University of Otago, Dunedin, New Zealand 9015
J Nutr 138:581-6. 2008..Despite some early functional vitamin B-12 deficiency, there was no macrocytic anemia. Consumption of fermented enset may have increased vitamin B-12 levels in diet and plasma... - Adverse event associated with methionine loading test: a case reportE M Cottington
Case Western Reserve University, Cleveland, Ohio, USA
Arterioscler Thromb Vasc Biol 22:1046-50. 2002.... - Prevention of brain disease from severe 5,10-methylenetetrahydrofolate reductase deficiencyKevin A Strauss
Clinic for Special Children, Strasburg, PA 17579, USA
Mol Genet Metab 91:165-75. 2007..To effectively support the metabolic requirements of rapid brain growth, a large dose of betaine should be started early in life... - The descent curve of the grand multiparous womanEdith D Gurewitsch
Department of Obstetrics and Gynecology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
Am J Obstet Gynecol 189:1036-41. 2003..The purpose of this study was to compare the descent curves and second-stage length among grand multiparous, nulliparous, and lower parity multiparous women... - Response of elevated methylmalonic acid to three dose levels of oral cobalamin in older adultsSuparna Rajan
Seattle Veteran Affairs Puget Sound Health Care System, Seattle, Washington, USA
J Am Geriatr Soc 50:1789-95. 2002..CONCLUSIONS: Most Cbl-deficient older people require more than 100 microg of oral Cbl to normalize serum MMA, which is a larger dose than is available in most standard multivitamins and Cbl supplements... - Homocysteine and methylmalonic acid: markers to predict and avoid toxicity from pemetrexed therapyClet Niyikiza
Eli Lilly and Company, Lilly Corporate Center, Indianapolis, Indiana 46285, USA
Mol Cancer Ther 1:545-52. 2002..Most importantly, decreasing homocysteine levels via vitamin supplementation leads to a better safety profile of pemetrexed and possibly to an improved efficacy... - Vitamin B12, homocysteine and carotid plaque in the era of folic acid fortification of enriched cereal grain productsJulie Robertson
Department of Family Medicine, McMaster University, Hamilton, Ont
CMAJ 172:1569-73. 2005.... - Elevated methylmalonic acid is related to cognitive impairement in older adults enrolled in an elderly nutrition programMonica S Lewis
Department of Psychology, The University of Georgia, Athens, GA 30602, USA
J Nutr Elder 24:47-65. 2005..Monitoring and reducing serum MMA concentrations by increasing the intake of vitamin B12 may provide protection against cognitive decline in this and other older populations... - Infantile hypermethioninemia and hyperhomocysteinemia due to high methionine intake: a diagnostic trapS Harvey Mudd
NIMH DIRP LMB, Laboratory of Molecular Biology, National Institute of Mental Health, Building 36, Room 1B 08, 36 Convent Drive, MSC 4034, Bethesda, MD 20892 4034, USA
Mol Genet Metab 79:6-16. 2003.... - S-adenosylhomocysteine hydrolase deficiency in a human: a genetic disorder of methionine metabolismIvo Baric
Department of Pediatrics, University Hospital Center, Kispaticeva 12, 10000 Zagreb, Croatia
Proc Natl Acad Sci U S A 101:4234-9. 2004..Gene analysis revealed two mutations in exon 4: a maternally derived stop codon, and a paternally derived missense mutation. We discuss reasons for biochemical abnormalities and pathophysiological aspects of AdoHcy hydrolase deficiency... - Total homocysteine is associated with white matter hyperintensity volume: the Northern Manhattan StudyClinton B Wright
Department of Neurology, Columbia University College of Physicians and Surgeons and the Mailman School of Public Health, New York, NY, USA
Stroke 36:1207-11. 2005..White matter hyperintensities may be a risk factor for both, but studies of the relationship between tHcy and quantitative measures of white matter hyperintensity volume (WMHV) are lacking, especially in minority populations...