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Disconnect between the effects of serelaxin on renal function and outcome in acute heart failure. Clin Res Cardiol 2023:10.1007/s00392-022-02144-6. [PMID: 36656377 DOI: 10.1007/s00392-022-02144-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Accepted: 12/19/2022] [Indexed: 01/20/2023]
Abstract
BACKGROUND We aimed to study whether improvement in renal function by serelaxin in patients who were hospitalized for acute heart failure (HF) might explain any potential effect on clinical outcomes. METHODS We included 6318 patients from the RELAXin in AHF-2 (RELAX-AHF2) study. Improvement in renal function was defined as a decrease in serum creatinine of ≥ 0.3 mg/dL and ≥ 25%, or increase in estimated glomerular filtration rate of ≥ 25% between baseline and day 2. Worsening renal function (WRF) was defined as the reverse. We performed causal mediation analyses regarding 180-day all-cause mortality (ACM), cardiovascular death (CVD), and hospitalization for HF/renal failure. RESULTS Improvement in renal function was more frequently observed with serelaxin when compared with placebo [OR 1.88 (95% CI 1.64-2.15, p < 0.0001)], but was not associated with subsequent clinical outcomes. WRF occurred less frequent with serelaxin [OR 0.70 (95% CI 0.60-0.83, p < 0.0001)] and was associated with increased risk of ACM, worsening HF and the composite of CVD and HF or renal failure hospitalization. Improvement in renal function did not mediate the treatment effect of serelaxin [CVD HR 1.01 (0.99-1.04), ACM HR 1.01 (0.99-1.03), HF/renal failure hospitalization HR 0.99 (0.97-1.00)]. CONCLUSIONS Despite the significant improvement in renal function by serelaxin in patients with acute HF, the potential beneficial treatment effect was not mediated by improvement in renal function. These data suggest that improvement in renal function might not be a suitable surrogate marker for potential treatment efficacy in future studies with novel relaxin agents in acute HF. Central illustration. Conceptual model explaining mediation analysis; treatment efficacy of heart failure therapies mediated by renal function.
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FREEDOM FROM ITCH AND HIVES IN CHRONIC SPONTANEOUS URTICARIA IS ASSOCIATED WITH IMPROVED QUALITY-OF-LIFE MEASURES. Ann Allergy Asthma Immunol 2022. [DOI: 10.1016/j.anai.2022.08.589] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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P049 LIGELIZUMAB ACHIEVES FREEDOM FROM DISEASE ACTIVITY IN CHRONIC SPONTANEOUS URTICARIA REGARDLESS OF PREVIOUS H1-ANTIHISTAMINE DOSE. Ann Allergy Asthma Immunol 2021. [DOI: 10.1016/j.anai.2021.08.084] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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P047 COMPLETE RESPONSE WITH LIGELIZUMAB IN CHRONIC SPONTANEOUS URTICARIA: A COMPOSITE SCORE OF SYMPTOMS AND QUALITY-OF-LIFE. Ann Allergy Asthma Immunol 2021. [DOI: 10.1016/j.anai.2021.08.082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Developing a Standard Set of Patient-centred Outcomes for Adult Oral Health - An International, Cross-disciplinary Consensus. Int Dent J 2021; 71:40-52. [PMID: 33616051 PMCID: PMC9275363 DOI: 10.1111/idj.12604] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
Objective To develop a minimum Adult Oral Health Standard Set (AOHSS) for use in clinical practice, research, advocacy and population health. Materials and methods An international oral health working group (OHWG) was established, of patient advocates, researchers, clinicians and public health experts to develop an AOHSS. PubMed was searched for oral health clinical and patient-reported measures and case-mix variables related to caries and periodontal disease. The selected patient-reported outcome measures focused on general oral health, and oral health-related quality of life tools. A consensus was reached via Delphi with parallel consultation of subject matter content experts. Finally, comments and input were elicited from oral health stakeholders globally, including patients/consumers. Results The literature search yielded 1,453 results. After inclusion/exclusion criteria, 959 abstracts generated potential outcomes and case-mix variables. Delphi rounds resulted in a consensus-based selection of 80 individual items capturing 31 outcome and case-mix concepts. Global reviews generated 347 responses from 87 countries, and the patient/consumer validation survey elicited 129 responses. This AOHSS includes 25 items directed towards patients (including demographics, the impact of their oral health on oral function, a record of pain and oral hygiene practices, and financial implications of care) and items for clinicians to complete, including medical history, a record of caries and periodontal disease activity, and types of dental treatment delivered. Conclusion In conclusion, utilising a robust methodology, a standardised core set of oral health outcome measures for adults, with a particular emphasis on caries and periodontal disease, was developed.
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Le traitement à long terme par le ligélizumab permet un contrôle prolongé des symptômes chez les patients atteints d’urticaire chronique spontanée pendant le suivi post-traitement. Ann Dermatol Venereol 2020. [DOI: 10.1016/j.annder.2020.09.535] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Le retraitement par ligélizumab est très efficace chez les patients atteints d’urticaire chronique spontanée. Ann Dermatol Venereol 2020. [DOI: 10.1016/j.annder.2020.09.534] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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P155 SLEEP AND QUALITY OF LIFE IMPROVES WITH BETTER CONTROL OF URTICARIA SYMPTOMS: LIGELIZUMAB PHASE-2B STUDIES. Ann Allergy Asthma Immunol 2020. [DOI: 10.1016/j.anai.2020.08.088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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P153 COMPLETE CONTROL OF URTICARIA SYMPTOMS WITH LIGELIZUMAB HELPS NORMALIZE QUALITY OF LIFE. Ann Allergy Asthma Immunol 2020. [DOI: 10.1016/j.anai.2020.08.086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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D101 EFFICACY OF LIGELIZUMAB IN PATIENTS WITH CHRONIC SPONTANEOUS URTICARIA INADEQUATELY CONTROLLED WITH OMALIZUMAB. Ann Allergy Asthma Immunol 2020. [DOI: 10.1016/j.anai.2020.08.062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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P153 LIGELIZUMAB REDUCES RESCUE MEDICATION USE IN PATIENTS WITH CHRONIC SPONTANEOUS URTICARIA: PHASE 2B STUDY RESULTS. Ann Allergy Asthma Immunol 2019. [DOI: 10.1016/j.anai.2019.08.257] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Dynamics ofHeterocapsasp. and the associated attached and free-living bacteria under the influence of dispersed and undispersed crude oil. Lett Appl Microbiol 2016; 63:419-425. [DOI: 10.1111/lam.12661] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2016] [Revised: 07/11/2016] [Accepted: 08/20/2016] [Indexed: 12/22/2022]
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Harmonising spirometry education with HERMES: training a new generation of qualified spirometry practitioners across Europe. Eur Respir J 2011; 37:479-81. [PMID: 21357919 DOI: 10.1183/09031936.00187810] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Adult HERMES: criteria for accreditation of ERS European training centres in adult medicine. Breathe (Sheff) 2010. [DOI: 10.1183/20734735.020910] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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HERMES criteria for accreditation of European Training Centres: overcoming challenges of accreditation. Eur Respir J 2010; 36:1239-41. [DOI: 10.1183/09031936.00152310] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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[Quality of life after radical cystectomy - an overview and analysis of a contemporary series]. Aktuelle Urol 2010; 41:245-51. [PMID: 20517822 DOI: 10.1055/s-0030-1247394] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
OBJECTIVE Published evidence does not support a clear advantage in quality of life for continent versus incontinent urinary diversion or vice versa. PATIENTS AND METHODS We retrospectively assessed 61 patients after radical cystectomy with the EORTC-QLQ-C30 and -BLM30 instruments. Analysis was performed in dependence of age, sex, technique of urinary diversion and time-course of therapy. RESULTS 36 patients had an incontinent and 20 patients a continent urinary diversion. Younger patients (p = 0.001) and those with a continent urinary diversion (p = 0.03) were found to have a statistically significant higher incidence of financial problems. Also patients with continent urinary diversion had significantly (p = 0.032) more problems in social integration. Furthermore, there were significant differences in social integration (p = 0.03) and emotional ability (p = 0.008) in the age-dependent analysis. Patients with a continent diversion had significantly more meteoristic problems (p = 0.007). CONCLUSION This study also could not demonstrate any clear differences in dependence on the technique of urinary diversion. A good postoperative quality of life seems possible independent of age.
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Continuing medical education across Europe: the role of EBAP and the ERS in facing the challenges of life-long learning. Eur Respir J 2010; 35:721-2. [DOI: 10.1183/09031936.00191209] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Collateral blood flow complicating surgical repair of congenital heart disease. Thorac Cardiovasc Surg 2008. [DOI: 10.1055/s-2008-1037905] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Actual management of patients with familial ascending aortic aneurysms and type-A aortic dissections. Thorac Cardiovasc Surg 2007; 55:19-23. [PMID: 17285469 DOI: 10.1055/s-2006-924575] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
BACKGROUND There are few families with the diagnosis of ascending aortic aneurysm and acute type-A aortic dissection inherited as an autosomal-dominant disorder in the absence of a known genetic syndrome. METHODS We investigated a family with 26 members in whom ascending aortic aneurysms and acute type-A aortic dissections occurred over three generations. Examinations were performed to identify family members at specific risk. RESULTS Six members presented with acute type-A aortic dissections and three relatives had ascending aortic aneurysms. Clinical examinations showed no characteristics of a known genetic syndrome. Molecular genetic analysis revealed no mutations known to cause a form of autosomal-dominant inherited aortic disease. CONCLUSION Adequate diagnostic measures are mandatory in families with ascending aortic aneurysms or type-A aortic dissections to identify or exclude family members at risk for aortic diseases. Even in the absence of identifiable mutations causing isolated aortic aneurysms or aortic dissections, we recommend standardised examinations of all first-degree relatives of affected families. An indication for prophylactic aortic root replacement should be considered for patients at risk.
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Multi-lineage stem cells derived from the thymus gland of children during cardiac surgery as a source for regenerative medicine. Thorac Cardiovasc Surg 2006. [DOI: 10.1055/s-2006-925758] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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CFD-Simulation der reaktiven Zweiphasenströmung in einer Vorcalcinieranlage der Zementindustrie. CHEM-ING-TECH 2005. [DOI: 10.1002/cite.200590188] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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CFD-Simulation des Strahlungs- und Turbulenzverhaltens einer hochbeladenen reaktiven Zweiphasenströmung in einem großindustriellen Prozess. CHEM-ING-TECH 2005. [DOI: 10.1002/cite.200590128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Modellierung der Kohleverbrennung für die CFD-Simulation technischer Feuerungen. CHEM-ING-TECH 2005. [DOI: 10.1002/cite.200590187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Flow Characteristics of Countercurrent Spray Tower. CHEM-ING-TECH 2001. [DOI: 10.1002/1522-2640(200106)73:6<751::aid-cite7511111>3.0.co;2-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Abstract
As in adult patients, heparin is used for prophylaxis and treatment of thromboembolism in newborns, children, and adolescents. Patients receiving heparin are potentially at risk to develop heparin-induced thrombocytopenia (HIT). HIT type II has been extensively described in the adult population; only a few reports address HIT type II in pediatric patients (total of 15 neonates, 4 young children, 12 older children and adolescents). The available data are discussed, and the case of a patient with recurrent thrombosis and HIT type II without thrombocytopenia is presented. The review of the literature reveals that HIT type II occurs especially in neonates and adolescents, corresponding to the two age peaks of thrombosis in pediatric patients. Risk factors for thrombosis include hereditary factors, immobilization, and surgery. HIT complications are severe and partly lead to life-threatening thromboembolism. In three patients, an increasing heparin demand was found. In five cases, thrombocytopenia was absent. Heparin was replaced mostly by danaparoid sodium; in three patients hirudin was used as an alternative anticoagulant. HIT type II represents a potentially dangerous complication of heparin therapy in pediatric patients and should be taken into consideration whenever heparin is given for prophylactic or therapeutic use in newborns, children, or adolescents.
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Formation of a novel colored product during the Maillard reaction of D-glucose. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2001; 49:1966-1970. [PMID: 11308354 DOI: 10.1021/jf001231s] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Reactions between reducing sugars and proteins or amino acids (Maillard reaction) lead to the formation of yellow to brown products (melanoidins) that are important for food preparation and processing, such as baking, roasting, or malt production. Thus far, the structures of the melanoidins have not been elucidated, although some structural insights have been gained from model reactions. In this study, D-glucose was heated with an amine and two colored compounds were detected by HPLC/UV--vis. After purification, the main product was identified as [(4aS,6R,7S,8R,8aR)-4,4a,6,7,8,8a-hexahydro-7,8-dihydroxy-6-hydroxymethyl-1,4-dipropyl-1H-pyrano[2,3-b]pyrazine-2-yl]-1-hydroxy-3-buten-2-one (1a). For the minor compound (2a), some spectral data were obtained, but the structure was not fully characterized. 1a and 2a are the main colored compounds when the reaction is performed in alcoholic solution or on a cellulose surface. Thus, it was concluded that products with an analogous structure are important for the color formation of foodstuffs with low water activity.
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Abstract
We tested the response to desmopressin (1-deamino-cys-8-D-arginine-vasopressin; DDAVP) in four patients with haemophilia B [factor IX (F IX) at diagnosis 1.4-5%]. The activated partial thromboplastin time (aPTT) was significantly shortened in all patients. Although there was an up to 1.4-fold increase in F IX levels in three patients, maximal F IX activity remained below 10%. Much more prominent were the increases in F VIII (three- to fourfold), in von Willebrand factor antigen (VWF:Ag; 2.5-fold) and particularly in VWF collagen-binding activity (VWF:CBA; fivefold). These changes were reflected by the prophylactic efficacy of DDAVP for dental surgery. After pretesting, DDAVP could be a useful drug for reducing the need for plasma products for prevention of minor surgical bleeding in patients with mild to moderate haemophilia B.
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DDAVP (desmopressin; 1-deamino-cys-8- d
-arginine-vasopressin) treatment in children with haemophilia B. Br J Haematol 2000. [DOI: 10.1111/j.1365-2141.2000.02504.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Formation of tetrahydro-beta-carbolines and beta-carbolines during the reaction of L-tryptophan with D-glucose. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2000; 48:2111-2116. [PMID: 10888507 DOI: 10.1021/jf991237l] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The reaction of L-tryptophan (Trp) with D-glucose under conditions that can occur during food processing and preparation was studied by high-performance liquid chromatography with diode array detection (HPLC/DAD). Besides the well-established glucose-tryptophan Amadori product (AP), (1R,3S)-1-(D-gluco-1,2,3,4,5-pentahydroxypentyl)-1,2,3, 4-tetrahydro-beta-carboline-3-carboxylic acid (PHP-THbetaC) was identified as an important product of this reaction. For preparation, PHP-THbetaC was obtained in high yields when Trp and D-glucose were reacted under strongly acidic conditions after heating in methanol. At elevated reaction temperatures (150 degrees C) 1-acetyl-beta-carboline (acetyl-betaC), was detected in significant concentrations. The mixtures were heated under variations of reaction time and temperature, and AP, PHP-THbetaC, and acetyl-betaC were quantified. In the presence of air oxygen or mild, food relevant oxidants, such as L-dehydroascorbic acid, PHP-THbetaC was readily oxidized to a product that was identified as the previously unknown 1-(D-gluco-1,2,3,4,5-pentahydroxypentyl)-beta-carboline (PHP-betaC). Formation of PHP-THbetaC and PHP-betaC in foodstuffs would deserve particular interest because multiple physiological activity of THbetaC and betaC derivatives has been shown previously.
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Cross-linking of proteins by Maillard processes--model reactions of D-glucose or methylglyoxal with butylamine and guanidine derivatives. Bioorg Med Chem 1998; 6:993-1002. [PMID: 9730235 DOI: 10.1016/s0968-0896(98)00058-3] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Advanced Maillard reaction in proteins leads to formation of covalently cross-linked aggregates the chemical nature of which is largely unknown. From model reactions of methylglyoxal and butylamine with creatine or alpha-N-acetyl-L-arginine, one main product each was isolated. These two compounds were identified, on the basis of unequivocal spectroscopic evidence, as 2-[(5-butylimino-4-methyl-4,5-dihydro-1H-2-imidazolyl)(methyl)amin o]acetic acid and 2-acetylamino-5-[(5-butylimino-4-methyl-4,5-dihydro-1H-2-imidazoly l)amino]pentanoic acid, respectively. Using D-glucose instead of methylglyoxal, two main products each were obtained from reaction with the respective guanidine derivative. The spectroscopic data definitively establish the formation of the diastereoisomeric 2-[(4-butyl-6,7-dihydroxy-4,5,6,7,8,8a-hexahydroimidazo[4,5-b]a zepin-2-yl)(methyl)amino]acetic acid from the reaction with creatine, and of the diastereoisomeric 2-acetylamino-5-[(4-butyl-6,7-dihydroxy-4,5,6,7,8,8a-hexahydroimidazo [4,5-b]azepin-2-yl)amino]pentanoic acid from the reaction with alpha-N-acetyl-L-arginine. All products were isolated in fairly good yield and represent 1:1:1 adducts of the respective reaction partners. Formation of these compounds thus constitutes an efficient reaction pathway for linking primary amines to guanidine derivatives. It seems justified, therefore, to expect cross-linking of proteins by action of reducing carbohydrates to proceed analogously.
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[Update in ophthalmology (Prague, 10-13 March 1997)]. OFTALMOLOGIA (BUCHAREST, ROMANIA : 1990) 1997; 41:278-80. [PMID: 9409977] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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Relevance of microenvironmental pH for self-organized tumor growth and invasion. Anticancer Res 1994; 14:1573-83. [PMID: 7979188] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The process of tumor cell growth, invasion and metastasis involves a self-organized cascade of multiple tumor-host and tumor-immune interactions. The prediction of cancer development based exclusively on molecular evidence is still impossible because of the complex and heterogeneous control mechanisms actually acting in cellular systems. In contrast, most tumor cell systems display a limited spectrum of macroscopically observable modes of action which emerge as a result of cellular self-organization. The stability of the dynamic modes is controlled by relatively few order parameters. Their number and characteristics are different in normal and neoplastic growth. A systems-oriented analysis utilizing our method of Structured Biological Modelling (SBM) suggests that microenvironmental pH (pHme) can function as an important order parameter for self-organized cancer development. In the scope of an integrated minimal model for the multistep development of invasive tumor growth, this finding will be discussed with respect to its evolution, diagnostic relevance and possible therapeutical implications. The study underlines the necessity of minimal invasive methods for the on-line in vitro and in vivo monitoring of pH, oxygen, signal transducing molecules and essential nutrients in the microenvironment of tumor cells.
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Abstract
In the microenvironment of many solid tumors the pH is considerably lower (mean pH between 6.6 to 7.2) than the pH in normal tissue (pH 7.0-7.5). Therefore, the influence of acidic pH on the cytotoxic activity of lymphokine-activated killer cells (LAK cells) after different culture periods was tested. K-562 human erythroleukemia cells were selected as target cells. Cell killing was measured using a two-color flow cytometric method. At physiological pH of 7.4, LAK cell-mediated cytotoxicity ranged from 15 to 48% (E:T ratio = 50:1). The specific lysis of target cells was considerably reduced (up to 70% inhibition of specific lysis) under acidic conditions (pH 6.8, 6.3, 5.8). This effect was independent of donors, duration of the culture period, and the E:T ratio in the cytotoxic assay. As pH gradients surrounding tumor cells may reach values below pH 6.0 at the cell surface, the pH-dependence of LAK cell cytotoxicity could at least partially explain the inhibition of the natural immune response in solid tumors. Therapeutic immunological strategies concerning the enhancement of the natural immune response like LAK cell and IL-2 immunotherapy including IL-2 gene therapy may only be successful if a simultaneous inhibition of the acidification process and an elevation of tumor pH is achieved.
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HPLC separation of some characteristic components in reaction mixtures of disaccharides with amines-model systems for milk and cereal products. ACTA ACUST UNITED AC 1992. [DOI: 10.1007/bf01197723] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Formation of acids, lactones and esters through the Maillard reaction. ZEITSCHRIFT FUR LEBENSMITTEL-UNTERSUCHUNG UND -FORSCHUNG 1990; 190:212-6. [PMID: 2330759 DOI: 10.1007/bf01192968] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
From a glucose/glycine reaction mixture acids, esters and lactones were isolated and identified. Sugar degradation products could also be determined as benzimidazole derivatives after reaction with o-phenylenediamine. Results derived from model systems suggested possible reaction pathways leading to some of the isolated substances. A lactic acid ester is formed as a product of an unstable beta-pyranone intermediate. A 3-deoxyhexosone serves as a precursor of two furanolactones.
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[Maillard reaction of bovine serum albumin with glucose. Determination of 2-formyl-5-(hydroxymethyl)pyrrole-1-norleucine by high-performance liquid chromatography after alkaline hydrolysis]. J Chromatogr A 1989; 463:119-25. [PMID: 2715232 DOI: 10.1016/s0021-9673(01)84458-7] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Reactions between glucose and bovine serum albumin proceed predominantly at the side chain amino groups of lysine residues. Among other products, protein-bound 2-formyl-5-(hydroxymethyl)pyrrole-1-norleucine is formed. After alkaline hydrolysis and fractionation of the protein hydrolysate on RP-18 material this substance can be separated by high-performance liquid chromatography. The identity of the norleucine derivative with a synthesized compound can be determined with fast atom bombardment-mass spectrometry spectral data. A colour reaction with thiobarbituric acid is also suitable for detection.
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[Care for the aged. Attention directed at causes of falls in the elderly]. SYGEPLEJERSKEN 1983; 83:7-9. [PMID: 6553394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/05/2023]
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[Reaction of dihydroxyacetone with methylammoniumacetate. Studies on the maillard-reaction. X. (author's transl)]. ZEITSCHRIFT FUR LEBENSMITTEL-UNTERSUCHUNG UND -FORSCHUNG 1976; 161:45-51. [PMID: 973448 DOI: 10.1007/bf01145419] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
By heating dihydroxyacetone and methylammoniumacetate in aqueous solution, a deeply brown coloured reaction mixture is obtained. The products extractable with methylenechlorid were separated. Several heterocyclic compounds (1-30) could be identified.
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[Reactions of heterocyclic nitro compounds. 3. Reactions of 2-chloro-5-nitro and 2-chloro-3-nitro-pyridinium salts with bases]. CHEMISCHE BERICHTE 1970; 103:1-6. [PMID: 5410746 DOI: 10.1002/cber.19701030102] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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[Transformation of aromatic nitro compounds with sodium borohydride. V]. CHEMISCHE BERICHTE 1969; 102:3909-14. [PMID: 5361866 DOI: 10.1002/cber.19691021135] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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[Transformations of nitroenamines. VII. Transformation of nitroenamines with organometallic compounds]. CHEMISCHE BERICHTE 1969; 102:2966-71. [PMID: 5806149 DOI: 10.1002/cber.19691020911] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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[Transformation of heterocyclic nitro-compounds. II. Addition of bases to 3-nitro-N-methylpyridinium iodide]. CHEMISCHE BERICHTE 1969; 102:2163-8. [PMID: 5802854 DOI: 10.1002/cber.19691020702] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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[Transformations with 1-notro-2-dimethylamino-ethylene. VI. Preparation and reactions of nitroethylidene derivatives of fluorenes and indenes]. CHEMISCHE BERICHTE 1969; 102:1707-14. [PMID: 5801385 DOI: 10.1002/cber.19691020538] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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