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  1. Article ; Online: Presentation of the 2019 SSCI Founders' Medal Award.

    Lee Hamm, L

    The American journal of the medical sciences

    2019  Volume 358, Issue 1, Page(s) 62

    MeSH term(s) Awards and Prizes ; Clinical Medicine/history ; History, 21st Century ; Humans ; Societies, Medical/history ; United States
    Language English
    Publishing date 2019-05-07
    Publishing country United States
    Document type Editorial ; Historical Article
    ZDB-ID 82078-7
    ISSN 1538-2990 ; 0002-9629
    ISSN (online) 1538-2990
    ISSN 0002-9629
    DOI 10.1016/j.amjms.2019.04.021
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Characteristics of mammalian Rh glycoproteins (SLC42 transporters) and their role in acid-base transport.

    Nakhoul, Nazih L / Lee Hamm, L

    Molecular aspects of medicine

    2013  Volume 34, Issue 2-3, Page(s) 629–637

    Abstract: The mammalian Rh glycoproteins belong to the solute transporter family SLC42 and include RhAG, present in red blood cells, and two non-erythroid members RhBG and RhCG that are expressed in various tissues, including kidney, liver, skin and the GI tract. ... ...

    Abstract The mammalian Rh glycoproteins belong to the solute transporter family SLC42 and include RhAG, present in red blood cells, and two non-erythroid members RhBG and RhCG that are expressed in various tissues, including kidney, liver, skin and the GI tract. The Rh proteins in the red blood cell form an "Rh complex" made up of one D-subunit, one CE-subunit and two RhAG subunits. The Rh complex has a well-known antigenic effect but also contributes to the stability of the red cell membrane. RhBG and RhCG are related to the NH4(+) transporters of the yeast and bacteria but their exact function is yet to be determined. This review describes the expression and molecular properties of these membrane proteins and their potential role as NH3/NH4(+) and CO2 transporters. The likelihood that these proteins transport gases such as CO2 or NH3 is novel and significant. The review also describes the physiological importance of these proteins and their relevance to human disease.
    MeSH term(s) Blood Proteins/genetics ; Blood Proteins/metabolism ; Blood Proteins/physiology ; Carbon Dioxide/metabolism ; Cation Transport Proteins/genetics ; Cation Transport Proteins/metabolism ; Cation Transport Proteins/physiology ; Glycoproteins/genetics ; Glycoproteins/metabolism ; Glycoproteins/physiology ; Humans ; Membrane Glycoproteins/genetics ; Membrane Glycoproteins/metabolism ; Membrane Glycoproteins/physiology ; Membrane Transport Proteins/genetics ; Membrane Transport Proteins/metabolism ; Membrane Transport Proteins/physiology ; Models, Genetic ; Models, Molecular ; Multigene Family/genetics ; Protein Conformation ; Quaternary Ammonium Compounds/metabolism ; Skin/metabolism ; Substrate Specificity ; Viscera/metabolism
    Chemical Substances Blood Proteins ; Cation Transport Proteins ; Glycoproteins ; Membrane Glycoproteins ; Membrane Transport Proteins ; Quaternary Ammonium Compounds ; RHAG protein, human ; RHBG protein, human ; RHCG protein, human ; Carbon Dioxide (142M471B3J)
    Language English
    Publishing date 2013-03-16
    Publishing country England
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 197640-0
    ISSN 1872-9452 ; 0098-2997
    ISSN (online) 1872-9452
    ISSN 0098-2997
    DOI 10.1016/j.mam.2012.05.013
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Acid-base and potassium homeostasis.

    Lee Hamm, L / Hering-Smith, Kathleen S / Nakhoul, Nazih L

    Seminars in nephrology

    2013  Volume 33, Issue 3, Page(s) 257–264

    Abstract: Acid-base balance and potassium disorders are often clinically linked. Importantly, acid-base disorders alter potassium transport. In general, acidosis causes decreased K(+) secretion and increased reabsorption in the collecting duct. Alkalosis has the ... ...

    Abstract Acid-base balance and potassium disorders are often clinically linked. Importantly, acid-base disorders alter potassium transport. In general, acidosis causes decreased K(+) secretion and increased reabsorption in the collecting duct. Alkalosis has the opposite effects, often leading to hypokalemia. Potassium disorders also influence acid-base homeostasis. Potassium depletion causes increased H(+) secretion, ammoniagenesis and H-K-ATPase activity. Hyperkalemia decreases ammoniagenesis and NH4(+) transport in the thick ascending limb. Some combined potassium and acid-base disorders involve indirect factors such as aldosterone, impaired renal function, volume depletion, and diarrhea. In summary, disorders of potassium and acid-base homeostasis are mechanistically linked and clinically important.
    MeSH term(s) Acid-Base Equilibrium/physiology ; Acid-Base Imbalance/metabolism ; Acid-Base Imbalance/physiopathology ; Homeostasis/physiology ; Humans ; Hyperkalemia/metabolism ; Hyperkalemia/physiopathology ; Hypokalemia/metabolism ; Hypokalemia/physiopathology ; Kidney Tubules/metabolism ; Potassium/metabolism
    Chemical Substances Potassium (RWP5GA015D)
    Language English
    Publishing date 2013-08-16
    Publishing country United States
    Document type Journal Article ; Review
    ZDB-ID 604652-6
    ISSN 1558-4488 ; 0270-9295
    ISSN (online) 1558-4488
    ISSN 0270-9295
    DOI 10.1016/j.semnephrol.2013.04.006
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Hematuria as a risk factor for progression of chronic kidney disease and death: findings from the Chronic Renal Insufficiency Cohort (CRIC) Study.

    Orlandi, Paula F / Fujii, Naohiko / Roy, Jason / Chen, Hsiang-Yu / Lee Hamm, L / Sondheimer, James H / He, Jiang / Fischer, Michael J / Rincon-Choles, Hernan / Krishnan, Geetha / Townsend, Raymond / Shafi, Tariq / Hsu, Chi-Yuan / Kusek, John W / Daugirdas, John T / Feldman, Harold I

    BMC nephrology

    2018  Volume 19, Issue 1, Page(s) 150

    Abstract: Background: Hematuria is associated with chronic kidney disease (CKD), but has rarely been examined as a risk factor for CKD progression. We explored whether individuals with hematuria had worse outcomes compared to those without hematuria in the CRIC ... ...

    Abstract Background: Hematuria is associated with chronic kidney disease (CKD), but has rarely been examined as a risk factor for CKD progression. We explored whether individuals with hematuria had worse outcomes compared to those without hematuria in the CRIC Study.
    Methods: Participants were a racially and ethnically diverse group of adults (21 to 74 years), with moderate CKD. Presence of hematuria (positive dipstick) from a single urine sample was the primary predictor. Outcomes included a 50% or greater reduction in eGFR from baseline, ESRD, and death, over a median follow-up of 7.3 years, analyzed using Cox Proportional Hazards models. Net reclassification indices (NRI) and C statistics were calculated to evaluate their predictive performance.
    Results: Hematuria was observed in 1145 (29%) of a total of 3272 participants at baseline. Individuals with hematuria were more likely to be Hispanic (22% vs. 9.5%, respectively), have diabetes (56% vs. 48%), lower mean eGFR (40.2 vs. 45.3 ml/min/1.73 m2), and higher levels of urinary albumin > 1.0 g/day (36% vs. 10%). In multivariable-adjusted analysis, individuals with hematuria had a greater risk for all outcomes during the first 2 years of follow-up: Halving of eGFR or ESRD (HR Year 1: 1.68, Year 2: 1.36), ESRD (Year 1: 1.71, Year 2: 1.39) and death (Year 1:1.92, Year 2: 1.77), and these associations were attenuated, thereafter. Based on NRIs and C-statistics, no clear improvement in the ability to improve prediction of study outcomes was observed when hematuria was included in multivariable models.
    Conclusion: In a large adult cohort with CKD, hematuria was associated with a significantly higher risk of CKD progression and death in the first 2 years of follow-up but did not improve risk prediction.
    MeSH term(s) Adult ; Aged ; Cohort Studies ; Disease Progression ; Female ; Hematuria/diagnosis ; Hematuria/mortality ; Hematuria/urine ; Humans ; Kidney Failure, Chronic/diagnosis ; Kidney Failure, Chronic/mortality ; Kidney Failure, Chronic/urine ; Male ; Middle Aged ; Mortality/trends ; Prospective Studies ; Renal Insufficiency, Chronic/diagnosis ; Renal Insufficiency, Chronic/mortality ; Renal Insufficiency, Chronic/urine ; Risk Factors
    Language English
    Publishing date 2018-06-26
    Publishing country England
    Document type Journal Article ; Multicenter Study ; Research Support, N.I.H., Extramural
    ZDB-ID 2041348-8
    ISSN 1471-2369 ; 1471-2369
    ISSN (online) 1471-2369
    ISSN 1471-2369
    DOI 10.1186/s12882-018-0951-0
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: DNA methylation levels of CYP2R1 and CYP24A1 predict vitamin D response variation.

    Zhou, Yu / Zhao, Lan-Juan / Xu, Xiaojing / Ye, An / Travers-Gustafson, Dianne / Zhou, Boting / Wang, Hong-Wei / Zhang, Weidong / Lee Hamm, L / Deng, Hong-Wen / Recker, Robert R / Lappe, Joan M

    The Journal of steroid biochemistry and molecular biology

    2013  Volume 144 Pt A, Page(s) 207–214

    Abstract: Factors contributing to the variability of serum 25-hydroxyvitamin D [25(OH)D] in response to a given dose of vitamin D supplementation are largely unknown. We examined whether DNA methylation levels of Cytochrome P450 (CYP) enzymes (CYP2R1, CYP24A1, ... ...

    Abstract Factors contributing to the variability of serum 25-hydroxyvitamin D [25(OH)D] in response to a given dose of vitamin D supplementation are largely unknown. We examined whether DNA methylation levels of Cytochrome P450 (CYP) enzymes (CYP2R1, CYP24A1, CYP27A1, and CYP27B1) are potential biomarkers predicting vitamin D response variation. We randomized 446 white postmenopausal women to a calcium and vitamin D (1100IU/day) intervention for at least 12 months. From these subjects, 18 with the highest 12-month increase in serum 25(OH)D were selected as "responders." Another 18 with the lowest 12-month increase in serum 25(OH)D were selected as "non-responders." DNA methylation levels between the groups were compared. To validate findings in the first study, association between DNA methylation levels and vitamin D response variation was studied in another 145 extended independent white postmenopausal women. In the first study, compared to non-responders, responders had significantly lower baseline DNA methylation levels in the promoter region of CYP2R1 (8% in the responders vs. 30% in the non-responders, P=0.004), and CYP24A1 (13% in the responders vs. 32% in the non-responders, P=0.001). In the validation study, for CYP2R1, baseline DNA methylation levels at eight CpG sites were negatively associated with 12-month increases in serum 25(OH)D (P<0.05). For CYP24A1, baseline DNA methylation levels at two CpG sites were also negatively associated with vitamin D response variation (r=-0.151, P=0.011; r=-0.131, P=0.025). These negative associations were consistent with the first study's results. Our findings indicate that baseline DNA methylation levels of CYP2R1 and CYP24A1 may predict vitamin D response variation. This article is part of a Special Issue entitled '16th Vitamin D Workshop'.
    MeSH term(s) Cholestanetriol 26-Monooxygenase/genetics ; Cytochrome P450 Family 2 ; DNA Methylation ; Female ; Genetic Variation ; Humans ; Randomized Controlled Trials as Topic ; Steroid Hydroxylases/genetics ; Vitamin D/administration & dosage ; Vitamin D/analogs & derivatives ; Vitamin D/blood ; Vitamin D3 24-Hydroxylase ; Vitamins/administration & dosage ; Vitamins/blood
    Chemical Substances Vitamins ; Vitamin D (1406-16-2) ; 25-hydroxyvitamin D (A288AR3C9H) ; Steroid Hydroxylases (EC 1.14.-) ; Cytochrome P450 Family 2 (EC 1.14.14.1) ; CYP2R1 protein, human (EC 1.14.14.24) ; Cholestanetriol 26-Monooxygenase (EC 1.14.15.15) ; CYP24A1 protein, human (EC 1.14.15.16) ; Vitamin D3 24-Hydroxylase (EC 1.14.15.16)
    Language English
    Publishing date 2013-10-12
    Publishing country England
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 1049188-0
    ISSN 1879-1220 ; 0960-0760
    ISSN (online) 1879-1220
    ISSN 0960-0760
    DOI 10.1016/j.jsbmb.2013.10.004
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Urine angiotensinogen and salt-sensitivity and potassium-sensitivity of blood pressure.

    Rebholz, Casey M / Chen, Jing / Zhao, Qi / Chen, Ji-Chun / Li, Jianxin / Cao, Jie / Gabriel Navar, Luis / Lee Hamm, Lotuce / Gu, Dongfeng / He, Jiang

    Journal of hypertension

    2015  Volume 33, Issue 7, Page(s) 1394–1400

    Abstract: Objective: Urinary excretion of angiotensinogen [urine angiotensinogen (UAGT)] has been proposed as a biomarker of intrarenal renin-angiotensin system activity. We investigated the association between UAGT and salt-sensitivity and potassium-sensitivity ... ...

    Abstract Objective: Urinary excretion of angiotensinogen [urine angiotensinogen (UAGT)] has been proposed as a biomarker of intrarenal renin-angiotensin system activity. We investigated the association between UAGT and salt-sensitivity and potassium-sensitivity of blood pressure (BP) among Genetic Epidemiology Network of Salt Sensitivity study participants.
    Methods: The intervention consisted of a 7-day low-sodium diet (51.3  mmol sodium/day), 7-day high-sodium diet (307.8  mmol sodium/day), and 7-day high-sodium diet with potassium supplementation (307.8  mmol sodium/day and 60  mmol potassium/day). Twenty-four-hour UAGT was estimated at baseline and at the end of each intervention for 100 randomly selected participants.
    Results: Median UAGT (μg/24  h) and UAGT-to-creatinine ratio (UAGT/Cr, μg/g) were significantly reduced during the low-sodium and potassium-supplementation interventions and increased during the high-sodium intervention (both P = 0.01). Baseline log-transformed UAGT and UAGT/Cr ratio were significantly positively associated with BP at baseline and at the end of each intervention. For example, one standard deviation higher log-UAGT/Cr ratio (1.2  μg/g) was associated with a 5.0-mmHg (95% confidence interval 2.3-7.8) higher SBP at the end of the high-sodium intervention, after adjusting for multiple covariates (P = 0.003). In addition, one standard deviation higher log-UAGT/Cr ratio was associated with a 1.6-mmHg increase in age-adjusted and sex-adjusted SBP from the low-sodium intervention to the high-sodium intervention (95% confidence interval 0.1-3.1, P = 0.04). This association was no longer statistically significant after multivariable adjustment.
    Conclusion: These data indicate that elevated UAGT are associated with BP sodium sensitivity. Augmentation of intrarenal renin-angiotensin system activity may play an important role in developing salt-sensitive hypertension.
    MeSH term(s) Adolescent ; Adult ; Angiotensinogen/urine ; Biomarkers/urine ; Blood Pressure/drug effects ; Blood Pressure/physiology ; Creatinine/urine ; Diet, Sodium-Restricted ; Female ; Humans ; Hypertension/chemically induced ; Hypertension/physiopathology ; Male ; Middle Aged ; Potassium/adverse effects ; Renin-Angiotensin System/physiology ; Sodium Chloride, Dietary/adverse effects ; Young Adult
    Chemical Substances Biomarkers ; Sodium Chloride, Dietary ; Angiotensinogen (11002-13-4) ; Creatinine (AYI8EX34EU) ; Potassium (RWP5GA015D)
    Language English
    Publishing date 2015-07
    Publishing country England
    Document type Journal Article ; Research Support, N.I.H., Extramural
    ZDB-ID 605532-1
    ISSN 1473-5598 ; 0263-6352 ; 0952-1178
    ISSN (online) 1473-5598
    ISSN 0263-6352 ; 0952-1178
    DOI 10.1097/HJH.0000000000000564
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Early inhibition of the renin-angiotensin system improves the long-term graft survival of single pediatric donor kidneys transplanted in adult recipients.

    Zhang, Rubin / Laguardia, Heather / Paramesh, Anil / Mills, Katherine / Killackey, Mary / McGee, Jennifer / Alper, Brent / Simon, Eric / Lee Hamm, Lotuce / Slakey, Douglas

    Transplant international : official journal of the European Society for Organ Transplantation

    2013  Volume 26, Issue 6, Page(s) 601–607

    Abstract: Transplanting single pediatric donor kidneys into adult recipients has an increased risk of hyperfiltration injury and graft loss. It is unknown if renin-angiotensin system (RAS) blockers are beneficial in this setting. We retrospectively analyzed 94 ... ...

    Abstract Transplanting single pediatric donor kidneys into adult recipients has an increased risk of hyperfiltration injury and graft loss. It is unknown if renin-angiotensin system (RAS) blockers are beneficial in this setting. We retrospectively analyzed 94 adults who received single kidneys from donors <10 years old during 1996-2009. The recipients were divided into group 1 with RAS blockers (n = 40) and group 2 without RAS blockers (n = 54) in the first year of transplant. There was no significant difference in any donor/recipient demographic between the two groups. Graft function, incidence of delayed graft function, acute rejection, and persistent proteinuria were not statistically different either. Kaplan-Meier estimated death-censored graft survivals were significantly better in group 1 than in group 2: 95 vs. 81.2%, 82.4 vs. 61.2%, 72.6 vs. 58.5%, and 68.5 vs. 47.2% at 1, 3, 5, and 7 years, respectively (log rank P = 0.043). Multivariable analysis found persistent proteinuria was a risk factor for graft loss (OR 2.70, 95% CI 1.33-5.49, P = 0.006), while RAS blockers reduced the risk of graft loss (OR 0.38, 95% CI 0.18-0.79, P = 0.009). Early RAS blockade therapy in the first year of transplant is associated with superior long-term graft survival among adults transplanted with single pediatric donor kidneys.
    MeSH term(s) Adult ; Angiotensin Receptor Antagonists/therapeutic use ; Angiotensin-Converting Enzyme Inhibitors/therapeutic use ; Child ; Child, Preschool ; Female ; Graft Survival/drug effects ; Graft Survival/physiology ; Humans ; Infant ; Kaplan-Meier Estimate ; Kidney/physiology ; Kidney Transplantation/methods ; Male ; Middle Aged ; Proteinuria/prevention & control ; Renin-Angiotensin System/drug effects ; Retrospective Studies ; Tissue Donors
    Chemical Substances Angiotensin Receptor Antagonists ; Angiotensin-Converting Enzyme Inhibitors
    Language English
    Publishing date 2013-06
    Publishing country England
    Document type Journal Article
    ZDB-ID 639435-8
    ISSN 1432-2277 ; 0934-0874
    ISSN (online) 1432-2277
    ISSN 0934-0874
    DOI 10.1111/tri.12087
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  8. Article ; Online: Proteinuria, but Not eGFR, Predicts Stroke Risk in Chronic Kidney Disease: Chronic Renal Insufficiency Cohort Study.

    Sandsmark, Danielle K / Messé, Steven R / Zhang, Xiaoming / Roy, Jason / Nessel, Lisa / Lee Hamm, Lotuce / He, Jiang / Horwitz, Edward J / Jaar, Bernard G / Kallem, Radhakrishna R / Kusek, John W / Mohler, Emile R / Porter, Anna / Seliger, Stephen L / Sozio, Stephen M / Townsend, Raymond R / Feldman, Harold I / Kasner, Scott E

    Stroke

    2015  Volume 46, Issue 8, Page(s) 2075–2080

    Abstract: Background and purpose: Chronic kidney disease is associated with an increased risk of cardiovascular events. However, the impact of chronic kidney disease on cerebrovascular disease is less well understood. We hypothesized that renal function severity ... ...

    Abstract Background and purpose: Chronic kidney disease is associated with an increased risk of cardiovascular events. However, the impact of chronic kidney disease on cerebrovascular disease is less well understood. We hypothesized that renal function severity would be predictive of stroke risk, independent of other vascular risk factors.
    Methods: The study population included 3939 subjects enrolled in the Chronic Renal Insufficiency Cohort (CRIC) study, a prospective observational cohort. Stroke events were reported by participants and adjudicated by 2 vascular neurologists. Cox proportional hazard models were used to compare measures of baseline renal function with stroke events. Multivariable analysis was performed to adjust for key covariates.
    Results: In 3939 subjects, 143 new stroke events (0.62 events per 100 person-years) occurred over a mean follow-up of 6.4 years. Stroke risk was increased in subjects who had worse baseline measurements of renal function (estimated glomerular filtration rate and total proteinuria or albuminuria). When adjusted for variables known to influence stroke risk, total proteinuria or albuminuria, but not estimated glomerular filtration rate, were associated with an increased risk of stroke. Treatment with blockers of the renin-angiotensin system did not decrease stroke risk in individuals with albuminuria.
    Conclusions: Proteinuria and albuminuria are better predictors of stroke risk in patients with chronic kidney disease than estimated glomerular filtration rate. The impact of therapies targeting proteinuria/albuminuria in individuals with chronic kidney disease on stroke prevention warrants further investigation.
    MeSH term(s) Aged ; Cohort Studies ; Female ; Glomerular Filtration Rate/physiology ; Humans ; Male ; Middle Aged ; Predictive Value of Tests ; Prospective Studies ; Proteinuria/diagnosis ; Proteinuria/epidemiology ; Proteinuria/metabolism ; Renal Insufficiency, Chronic/diagnosis ; Renal Insufficiency, Chronic/epidemiology ; Renal Insufficiency, Chronic/metabolism ; Risk Factors ; Stroke/diagnosis ; Stroke/epidemiology ; Stroke/metabolism
    Language English
    Publishing date 2015-08
    Publishing country United States
    Document type Journal Article ; Multicenter Study ; Observational Study ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 80381-9
    ISSN 1524-4628 ; 0039-2499 ; 0749-7954
    ISSN (online) 1524-4628
    ISSN 0039-2499 ; 0749-7954
    DOI 10.1161/STROKEAHA.115.009861
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