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  1. Article: Effect of probiotic feed supplement on performance and disease resistance of indian white shrimp Penaeus indicus H. Milne Edwards

    Uma, A / Abraham, T.J / Jeyaseelan, M.J.P / Sundararaj, V

    Journal of aquaculture in the tropics. May 1999. v. 14 (2)

    1999  

    Keywords disease resistance ; probiotics ; feed supplements ; mortality ; dosage ; feed conversion ; Vibrio ; Fenneropenaeus indicus
    Language English
    Dates of publication 1999-05
    Size p. 159-164.
    Document type Article
    ZDB-ID 58678-x
    ISSN 0970-0846
    ISSN 0970-0846
    Database NAL-Catalogue (AGRICOLA)

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  2. Article ; Online: Talectomy by Medial Surgical Approach for Congenital Vertical Talus in Arthrogryposis Multiplex Congenita.

    Abraham, Edward / Quan Soon, Camille H / Murphy, Angela / Toby, David

    Orthopedics

    2020  Volume 43, Issue 6, Page(s) e623–e626

    Abstract: Arthrogryposis multiplex congenita involves stiff contracture of joints and weak atrophic muscles presenting at birth. The two most common forms are amyoplasia and distal arthrogryposis. Amyoplasia affects all 4 extremities: internally rotated shoulders, ...

    Abstract Arthrogryposis multiplex congenita involves stiff contracture of joints and weak atrophic muscles presenting at birth. The two most common forms are amyoplasia and distal arthrogryposis. Amyoplasia affects all 4 extremities: internally rotated shoulders, extended fixed elbows, flexed fixed wrists, extended fixed knees, clubfeet, and decreased muscle volume. Distal arthrogryposis is a group of syndromes with a genetic basis. The distal joints are contracted. Clubfeet and congenital vertical talus are the most common foot deformities. A 10-year-old boy presented with distal arthrogryposis with bilateral congenital tali. He reported having deformed and painful feet and difficulty wearing shoes. His rocker-bottom foot deformities caused him to walk with a heel to heel gait. He also had stiff extended knees. His previous foot surgeries included failed open reduction and pin fixation of the talonavicular joints with Achilles tendon lengthening and capsulotomies. The boy underwent bilateral talectomies and releases of contracted joint capsules and lengthening of multiple extrinsic tendons through separate incisions. The talectomy of each foot was performed via a novel medial surgical approach. At 2-year follow-up, he had normal-appearing plantar grade feet. He had a painless gait, could ambulate independently, and was considered to have an excellent result. This is the first detailed report of performing a talectomy via a medial approach for bilateral congenital tali in a patient with arthrogryposis multiplex congenita. [Orthopedics. 2020; 43(6):e623-e626.].
    MeSH term(s) Arthrogryposis/physiopathology ; Arthrogryposis/surgery ; Child ; Gait/physiology ; Humans ; Joint Capsule/surgery ; Joint Capsule Release ; Male ; Orthopedic Procedures/methods ; Range of Motion, Articular/physiology ; Talus/physiopathology ; Talus/surgery ; Treatment Outcome ; Walking/physiology
    Language English
    Publishing date 2020-08-20
    Publishing country United States
    Document type Case Reports ; Journal Article
    ZDB-ID 424447-3
    ISSN 1938-2367 ; 0147-7447
    ISSN (online) 1938-2367
    ISSN 0147-7447
    DOI 10.3928/01477447-20200812-01
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Coal mine dust lung disease in miners killed in the Upper Big Branch disaster: a review of lung pathology and contemporary respirable dust levels in underground US coal mines.

    Go, Leonard H T / Green, Francis H Y / Abraham, Jerrold L / Churg, Andrew / Petsonk, Edward L / Cohen, Robert A

    Occupational and environmental medicine

    2021  Volume 79, Issue 5, Page(s) 319–325

    Abstract: Objectives: In 2010, 29 coal miners died due to an explosion at the Upper Big Branch (UBB) mine in West Virginia, USA. Autopsy examinations of 24 individuals with evaluable lung tissue identified 17 considered to have coal workers' pneumoconiosis (CWP). ...

    Abstract Objectives: In 2010, 29 coal miners died due to an explosion at the Upper Big Branch (UBB) mine in West Virginia, USA. Autopsy examinations of 24 individuals with evaluable lung tissue identified 17 considered to have coal workers' pneumoconiosis (CWP). The objectives of this study were to characterise histopathological findings of lung tissue from a sample of UBB fatalities and better understand the respirable dust concentrations experienced by these miners at UBB relative to other US coal mines.
    Methods: Occupational pulmonary pathologists evaluated lung tissue specimens from UBB fatalities for the presence of features of pneumoconiosis. Respirable dust and quartz samples submitted for regulatory compliance from all US underground coal mines prior to the disaster were analysed.
    Results: Families of seven UBB fatalities provided consent for the study. Histopathologic evidence of CWP was found in all seven cases. For the USA, central Appalachia and UBB, compliance dust samples showed the geometric mean for respirable dust was 0.468, 0.420 and 0.518 mg/m
    Conclusions: Although higher than average respirable dust and quartz levels were observed at UBB, over 200 US underground coal mines had higher dust concentrations than UBB and over 100 exceeded the PEL more frequently. Together with lung histopathological findings among UBB fatalities, these data suggest exposures leading to CWP in the USA are more prevalent than previously understood.
    MeSH term(s) Anthracosis ; Coal/adverse effects ; Coal/analysis ; Coal Mining ; Dust/analysis ; Humans ; Lung ; Lung Diseases ; Occupational Exposure/adverse effects ; Occupational Exposure/analysis ; Pneumoconiosis ; Quartz/adverse effects ; Quartz/analysis
    Chemical Substances Coal ; Dust ; Quartz (14808-60-7)
    Language English
    Publishing date 2021-12-08
    Publishing country England
    Document type Journal Article ; Review
    ZDB-ID 1180733-7
    ISSN 1470-7926 ; 1351-0711
    ISSN (online) 1470-7926
    ISSN 1351-0711
    DOI 10.1136/oemed-2021-107694
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Phenol-soluble modulins PSMα3 and PSMβ2 form nanotubes that are cross-α amyloids.

    Kreutzberger, Mark A B / Wang, Shengyuan / Beltran, Leticia C / Tuachi, Abraham / Zuo, Xiaobing / Egelman, Edward H / Conticello, Vincent P

    Proceedings of the National Academy of Sciences of the United States of America

    2022  Volume 119, Issue 20, Page(s) e2121586119

    Abstract: Phenol-soluble modulins (PSMs) are peptide-based virulence factors that play significant roles in the pathogenesis of staphylococcal strains in community-associated and hospital-associated infections. In addition to cytotoxicity, PSMs display the ... ...

    Abstract Phenol-soluble modulins (PSMs) are peptide-based virulence factors that play significant roles in the pathogenesis of staphylococcal strains in community-associated and hospital-associated infections. In addition to cytotoxicity, PSMs display the propensity to self-assemble into fibrillar species, which may be mediated through the formation of amphipathic conformations. Here, we analyze the self-assembly behavior of two PSMs, PSMα3 and PSMβ2, which are derived from peptides expressed by methicillin-resistant Staphylococcus aureus (MRSA), a significant human pathogen. In both cases, we observed the formation of a mixture of self-assembled species including twisted filaments, helical ribbons, and nanotubes, which can reversibly interconvert in vitro. Cryo–electron microscopy structural analysis of three PSM nanotubes, two derived from PSMα3 and one from PSMβ2, revealed that the assemblies displayed remarkably similar structures based on lateral association of cross-α amyloid protofilaments. The amphipathic helical conformations of PSMα3 and PSMβ2 enforced a bilayer arrangement within the protofilaments that defined the structures of the respective PSMα3 and PSMβ2 nanotubes. We demonstrate that, similar to amyloids based on cross-β protofilaments, cross-α amyloids derived from these PSMs display polymorphism, not only in terms of the global morphology (e.g., twisted filament, helical ribbon, and nanotube) but also with respect to the number of protofilaments within a given peptide assembly. These results suggest that the folding landscape of PSM derivatives may be more complex than originally anticipated and that the assemblies are able to sample a wide range of supramolecular structural space.
    MeSH term(s) Amyloid/chemistry ; Bacterial Toxins ; Cryoelectron Microscopy ; Humans ; Nanotubes ; Peptides/chemistry ; Staphylococcus aureus/metabolism
    Chemical Substances Amyloid ; Bacterial Toxins ; Peptides ; staphylococcal delta toxin
    Language English
    Publishing date 2022-05-09
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 209104-5
    ISSN 1091-6490 ; 0027-8424
    ISSN (online) 1091-6490
    ISSN 0027-8424
    DOI 10.1073/pnas.2121586119
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Factors associated with increased length of stay in degenerative cervical spine surgery: a cohort analysis from the Canadian Spine Outcomes and Research Network.

    Moskven, Eryck / McIntosh, Greg / Nataraj, Andrew / Christie, Sean D / Kumar, Rajesh / Phan, Philippe / Wang, Zhi / Tarabay, Bilal / Weber, Michael H / Singh, Supriya / Bailey, Christopher S / Manson, Neil A / Abraham, Edward / Paquet, Jérôme / Wilson, Jefferson R / Rampersaud, Y Raja / Fisher, Charles G / Dea, Nicolas / Charest-Morin, Raphaële

    Journal of neurosurgery. Spine

    2024  , Page(s) 1–10

    Abstract: Objective: Postoperative length of stay (LOS) significantly contributes to healthcare costs and resource utilization. The primary goal of this study was to identify patient, clinical, surgical, and institutional variables that influence LOS after ... ...

    Abstract Objective: Postoperative length of stay (LOS) significantly contributes to healthcare costs and resource utilization. The primary goal of this study was to identify patient, clinical, surgical, and institutional variables that influence LOS after elective surgery for degenerative conditions of the cervical spine. The secondary objectives were to examine the variability in LOS and institutional practices used to decrease LOS.
    Methods: This was a multicenter observational retrospective cohort study of patients enrolled in the Canadian Spine Outcomes and Research Network (CSORN) between January 2015 and October 2020 who underwent elective anterior cervical discectomy and fusion (ACDF) (1-3 levels) or posterior cervical fusion (PCF) (between C2 and T2) with/without decompression for degenerative conditions of the cervical spine. Prolonged LOS was defined as LOS greater than the median for the ACDF and PCF populations. The principal investigators at each participating CSORN healthcare institution completed a survey to capture institutional practices implemented to reduce postoperative LOS.
    Results: In total, 1228 patients were included (729 ACDF and 499 PCF patients). The median (IQR) LOS for ACDF and PCF were 1.0 (1.0) day and 5.0 (4.0) days, respectively. Predictors of prolonged LOS after ACDF were female sex, myelopathy diagnosis, lower baseline SF-12 mental component summary score, multilevel ACDF, and perioperative adverse events (AEs) (p < 0.05). Predictors of prolonged LOS after PCF were nonsmoking status, education less than high school, lower baseline numeric rating scale score for neck pain and EQ5D score, higher baseline Neck Disability Index score, and perioperative AEs (p < 0.05). Myelopathy did not significantly predict prolonged LOS within the PCF cohort after multivariate analysis. Of the 8 institutions (57.1%) with an enhanced recovery after surgery (ERAS) protocol or standardized protocol, only 3 reported using an ERAS protocol specific to patients undergoing ACDF or PCF.
    Conclusions: Patient and clinical factors predictive of prolonged LOS after ACDF and PCF are highly variable, warranting individual consideration for possible mitigation. Perioperative AEs remained a consistent independent predictor of prolonged LOS in both cohorts, highlighting the importance of preventing intra- and postoperative complications.
    Language English
    Publishing date 2024-04-05
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2158643-3
    ISSN 1547-5646 ; 1547-5654
    ISSN (online) 1547-5646
    ISSN 1547-5654
    DOI 10.3171/2024.1.SPINE231211
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Molecular surface programming of rectifying junctions between InAs colloidal quantum dot solids.

    Vafaie, Maral / Morteza Najarian, Amin / Xu, Jian / Richter, Lee J / Li, Ruipeng / Zhang, Yangning / Imran, Muhammad / Xia, Pan / Ban, Hyeong Woo / Levina, Larissa / Singh, Ajay / Meitzner, Jet / Pattantyus-Abraham, Andras G / García de Arquer, F Pelayo / Sargent, Edward H

    Proceedings of the National Academy of Sciences of the United States of America

    2023  Volume 120, Issue 41, Page(s) e2305327120

    Abstract: Heavy-metal-free III-V colloidal quantum dots (CQDs) show promise in optoelectronics: Recent advancements in the synthesis of large-diameter indium arsenide (InAs) CQDs provide access to short-wave infrared (IR) wavelengths for three-dimensional ranging ... ...

    Abstract Heavy-metal-free III-V colloidal quantum dots (CQDs) show promise in optoelectronics: Recent advancements in the synthesis of large-diameter indium arsenide (InAs) CQDs provide access to short-wave infrared (IR) wavelengths for three-dimensional ranging and imaging. In early studies, however, we were unable to achieve a rectifying photodiode using CQDs and molybdenum oxide/polymer hole transport layers, as the shallow valence bandedge (5.0 eV) was misaligned with the ionization potentials of the widely used transport layers. This occurred when increasing CQD diameter to decrease the bandgap below 1.1 eV. Here, we develop a rectifying junction among InAs CQD layers, where we use molecular surface modifiers to tune the energy levels of InAs CQDs electrostatically. Previously developed bifunctional dithiol ligands, established for II-VI and IV-VI CQDs, exhibit slow reaction kinetics with III-V surfaces, causing the exchange to fail. We study carboxylate and thiolate binding groups, united with electron-donating free end groups, that shift upward the valence bandedge of InAs CQDs, producing valence band energies as shallow as 4.8 eV. Photophysical studies combined with density functional theory show that carboxylate-based passivants participate in strong bidentate bridging with both In and As on the CQD surface. The tuned CQD layer incorporated into a photodiode structure achieves improved performance with EQE (external quantum efficiency) of 35% (>1 μm) and dark current density < 400 nA cm
    Language English
    Publishing date 2023-10-03
    Publishing country United States
    Document type Journal Article
    ZDB-ID 209104-5
    ISSN 1091-6490 ; 0027-8424
    ISSN (online) 1091-6490
    ISSN 0027-8424
    DOI 10.1073/pnas.2305327120
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: A novel method for predicting superior gluteal nerve safe zones in the lateral approach to the hip.

    Piponov, Hristo / Osmani, Feroz A / Parekh, Amit / Brooker, Jay M / Abraham, Edward / Hussain, Awais K / Patetta, Michael J / Gonzalez, Mark H

    Clinical anatomy (New York, N.Y.)

    2020  Volume 34, Issue 4, Page(s) 522–526

    Abstract: Introduction: The superior gluteal nerve (SGN) is at risk for laceration during lateral approach total hip arthroplasty (THA). The purpose of this study is to assess the accuracy of the trochanter-to-iliac crest distance (TCD) and the nerve-to- ... ...

    Abstract Introduction: The superior gluteal nerve (SGN) is at risk for laceration during lateral approach total hip arthroplasty (THA). The purpose of this study is to assess the accuracy of the trochanter-to-iliac crest distance (TCD) and the nerve-to-trochanter distance (NTD) ratio in determining a reproducible safe zone around the SGN independent of height.
    Materials and methods: Eighteen hemipelvises were dissected and the SGNs were exposed. The distance (NTD) from greater trochanter (GT) to the most inferior branch of the SGN encountered in each of the three approaches (Bauer et al., 1979) was measured. A reference distance (TCD) was measured from the GT to the highest point on the iliac crest. The NTD was divided by the TCD to generate standardized ratios. Coefficient of variation CV = (SD/mean) × 100 was calculated for each distance and ratio to measure relative variability.
    Results: The standardized ratios (and CV) were determined for the nerve branches in three different surgical approaches: Hardinge 0.464 (0.9%), Bauer 0.406 (1.7%), and Frndak 0.338 (4.1%). There was a strong correlation of the individual NTDs with the TCD: NTD for Hardinge (r = 0.996, p < .001), NTD for Bauer (r = 0.984, p < .001), and NTD for Frndak (r = 0.932, p < .001).
    Conclusion: By measuring the TCD preoperatively and using the respective standardized ratios, surgeons can accurately predict the NTD and how proximal to the GT each SGN branch can be expected to be encountered during lateral approach to the hip. This will allow surgeons to work with a more precise safe zone around the SGN and minimize the possibility for a nerve injury.
    MeSH term(s) Anatomic Landmarks ; Arthroplasty, Replacement, Hip/methods ; Buttocks/innervation ; Buttocks/surgery ; Cadaver ; Female ; Humans ; Male ; Peripheral Nerve Injuries/prevention & control
    Language English
    Publishing date 2020-03-12
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1025505-9
    ISSN 1098-2353 ; 0897-3806
    ISSN (online) 1098-2353
    ISSN 0897-3806
    DOI 10.1002/ca.23584
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Historical shift in pathological type of progressive massive fibrosis among coal miners in the USA.

    Go, Leonard H T / Rose, Cecile S / Zell-Baran, Lauren M / Almberg, Kirsten S / Iwaniuk, Cayla / Clingerman, Sidney / Richardson, Diana L / Abraham, Jerrold L / Cool, Carlyne D / Franko, Angela D / Green, Francis H Y / Hubbs, Ann F / Murray, Jill / Orandle, Marlene S / Sanyal, Soma / Vorajee, Naseema I / Sarver, Emily A / Petsonk, Edward L / Cohen, Robert A

    Occupational and environmental medicine

    2023  Volume 80, Issue 8, Page(s) 425–430

    Abstract: Background: Pneumoconiosis among coal miners in the USA has been resurgent over the past two decades, despite modern dust controls and regulatory standards. Previously published studies have suggested that respirable crystalline silica (RCS) is a ... ...

    Abstract Background: Pneumoconiosis among coal miners in the USA has been resurgent over the past two decades, despite modern dust controls and regulatory standards. Previously published studies have suggested that respirable crystalline silica (RCS) is a contributor to this disease resurgence. However, evidence has been primarily indirect, in the form of radiographic features.
    Methods: We obtained lung tissue specimens and data from the National Coal Workers' Autopsy Study. We evaluated specimens for the presence of progressive massive fibrosis (PMF) and used histopathological classifications to type these specimens into coal-type, mixed-type and silica-type PMF. Rates of each were compared by birth cohort. Logistic regression was used to assess demographic and mining characteristics associated with silica-type PMF.
    Results: Of 322 cases found to have PMF, study pathologists characterised 138 (43%) as coal-type, 129 (40%) as mixed-type and 55 (17%) as silica-type PMF. Among earlier birth cohorts, coal-type and mixed-type PMF were more common than silica-type PMF, but their rates declined in later birth cohorts. In contrast, the rate of silica-type PMF did not decline in cases from more recent birth cohorts. More recent year of birth was significantly associated with silica-type PMF.
    Conclusions: Our findings demonstrate a shift in PMF types among US coal miners, from a predominance of coal- and mixed-type PMF to a more commonly encountered silica-type PMF. These results are further evidence of the prominent role of RCS in the pathogenesis of pneumoconiosis among contemporary US coal miners.
    MeSH term(s) Humans ; United States/epidemiology ; Coal Mining ; Occupational Diseases/epidemiology ; Occupational Diseases/etiology ; Occupational Diseases/pathology ; Pneumoconiosis ; Silicon Dioxide/adverse effects ; Dust ; Coal/adverse effects ; Fibrosis
    Chemical Substances Silicon Dioxide (7631-86-9) ; Dust ; Coal
    Language English
    Publishing date 2023-06-09
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1180733-7
    ISSN 1470-7926 ; 1351-0711
    ISSN (online) 1470-7926
    ISSN 1351-0711
    DOI 10.1136/oemed-2022-108643
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Cost consequence analysis of waiting for lumbar disc herniation surgery.

    Dandurand, Charlotte / Mashayekhi, Mohammad Sadegh / McIntosh, Greg / Singh, Supriya / Paquet, Jerome / Chaudhry, Hasaan / Abraham, Edward / Bailey, Christopher S / Weber, Michael H / Johnson, Michael G / Nataraj, Andrew / Attabib, Najmedden / Kelly, Adrienne / Hall, Hamilton / Rampersaud, Y Raja / Manson, Neil / Phan, Philippe / Thomas, Ken / Fisher, Charles /
    Charest-Morin, Raphaele / Soroceanu, Alex / LaRue, Bernard / Dea, Nicolas

    Scientific reports

    2023  Volume 13, Issue 1, Page(s) 4519

    Abstract: The economic repercussions of waiting for lumbar disc surgery have not been well studied. The primary goal of this study was to perform a cost-consequence analysis of patients receiving early vs late surgery for symptomatic disc herniation from a ... ...

    Abstract The economic repercussions of waiting for lumbar disc surgery have not been well studied. The primary goal of this study was to perform a cost-consequence analysis of patients receiving early vs late surgery for symptomatic disc herniation from a societal perspective. Secondarily, we compared patient factors and patient-reported outcomes. This is a retrospective analysis of prospectively collected data from the CSORN registry. A cost-consequence analysis was performed where direct and indirect costs were compared, and different outcomes were listed separately. Comparisons were made on an observational cohort of patients receiving surgery less than 60 days after consent (short wait) or 60 days or more after consent (long wait). This study included 493 patients with surgery between January 2015 and October 2021 with 272 patients (55.2%) in the short wait group and 221 patients (44.8%) classified as long wait. There was no difference in proportions of patients who returned to work at 3 and 12-months. Time from surgery to return to work was similar between both groups (34.0 vs 34.9 days, p = 0.804). Time from consent to return to work was longer in the longer wait group corresponding to an additional $11,753.10 mean indirect cost per patient. The short wait group showed increased healthcare usage at 3 months with more emergency department visits (52.6% vs 25.0%, p < 0.032), more physiotherapy (84.6% vs 72.0%, p < 0.001) and more MRI (65.2% vs 41.4%, p < 0.043). This corresponded to an additional direct cost of $518.21 per patient. Secondarily, the short wait group had higher baseline NRS leg, ODI, and lower EQ5D and PCS. The long wait group had more patients with symptoms over 2 years duration (57.6% vs 34.1%, p < 0.001). A higher proportion of patients reached MCID in terms of NRS leg pain at 3-month follow up in the short wait group (84.0% vs 75.9%, p < 0.040). This cost-consequence analysis of an observational cohort showed decreased costs associated with early surgery of $11,234.89 per patient when compared to late surgery for lumbar disc herniation. The early surgery group had more severe symptoms with higher healthcare utilization. This is counterbalanced by the additional productivity loss in the long wait group, which likely have a more chronic disease. From a societal economic perspective, early surgery seems beneficial and should be promoted.
    MeSH term(s) Humans ; Intervertebral Disc Displacement/complications ; Retrospective Studies ; Costs and Cost Analysis ; Time ; Lumbosacral Region ; Lumbar Vertebrae/surgery ; Treatment Outcome
    Language English
    Publishing date 2023-03-18
    Publishing country England
    Document type Observational Study ; Journal Article
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-023-31029-5
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Continuous intravenous infusion of ATP in humans yields large expansions of erythrocyte ATP pools but extracellular ATP pools are elevated only at the start followed by rapid declines.

    Rapaport, Eliezer / Salikhova, Anna / Abraham, Edward H

    Purinergic signalling

    2015  Volume 11, Issue 2, Page(s) 251–262

    Abstract: ... intravenous infusions of 8 h once weekly for 8 weeks. Three values of blood ATP levels were determined. These were total ... within a narrow range in each individual. At the end of an 8 h continuous intravenous infusion of ATP ... by short-term intravenous infusions, of up to 4 h, may be a favorable way for elevating extracellular ATP ...

    Abstract The pharmacokinetics of adenosine 5'-triphosphate (ATP) was investigated in a clinical trial that included 15 patients with advanced malignancies (solid tumors). ATP was administered by continuous intravenous infusions of 8 h once weekly for 8 weeks. Three values of blood ATP levels were determined. These were total blood (erythrocyte) and blood plasma (extracellular) ATP pools along with the initial rate of release of ATP into the blood plasma. We found that values related to erythrocyte ATP pools showed great variability (diversity) among individuals (standard deviation of about 30-40% of mean at baseline). It was discovered that erythrocyte baseline ATP pool sizes are unique to each individual and that they fall within a narrow range in each individual. At the end of an 8 h continuous intravenous infusion of ATP, intracellular erythrocyte ATP pools were increased in the range of 40-60% and extracellular ATP declined from elevated levels achieved at the beginning and middle of the infusion, to baseline levels. The ability of erythrocytes to sequester exogenously administered ATP to this degree, after its initial conversion to adenosine in the blood plasma is unexpected, considering that some of the adenosine is likely to have been degraded by in vivo catabolic activities or taken up by organs. The data suggest that administration of ATP by short-term intravenous infusions, of up to 4 h, may be a favorable way for elevating extracellular ATP pools. A large fraction of the total exogenously administered ATP is sequestered into the intracellular compartments of the erythrocytes after an 8 h intravenous infusion. Erythrocytes loaded with ATP are known to release their ATP pools by the application of previously established agents or conditions applied locally or globally to circulating erythrocytes. Rapid degradation of intravenously administered ATP to adenosine and subsequent accumulation of ATP inside erythrocytes indicate the existence of very effective mechanisms for uptake of adenosine from blood plasma. These in vivo studies offer an understanding as to how both adenosine and ATP can act as purinergic transmission signals. ATP levels in blood are always accompanied by adenosine formed by catabolism of ATP. The continuous uptake of adenosine enables both to act in transmission of sometimes opposite functions.
    MeSH term(s) Adenosine/metabolism ; Adenosine Triphosphate/administration & dosage ; Adenosine Triphosphate/pharmacokinetics ; Adult ; Erythrocytes/drug effects ; Erythrocytes/metabolism ; Extracellular Space/metabolism ; Female ; Humans ; Infusions, Intravenous/methods ; Middle Aged ; Neoplasms/metabolism ; Purinergic Agents/metabolism ; Time Factors
    Chemical Substances Purinergic Agents ; Adenosine Triphosphate (8L70Q75FXE) ; Adenosine (K72T3FS567)
    Language English
    Publishing date 2015-06
    Publishing country Netherlands
    Document type Clinical Trial, Phase I ; Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2172143-9
    ISSN 1573-9546 ; 1573-9538
    ISSN (online) 1573-9546
    ISSN 1573-9538
    DOI 10.1007/s11302-015-9450-y
    Database MEDical Literature Analysis and Retrieval System OnLINE

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