Made available in DSpace on 2015-07-22T20:49:35Z (GMT). No. of bitstreams: 0 Previous issue date: 2010-03-31 / Objetivo: avaliar, comparativamente, o estado nutricional de indivíduos vegetarianos e onívoros, com relação ao estado nutricional de proteínas, vitamina B12, ácido fólico, homocisteína e metabólico pela avaliação da glicemia, insulinemia, perfil inflamatório e de lípides séricos. Métodos: estudo prospectivo, transversal com 59 indivíduos do sexo feminino fora de período de gestação ou amamentação, eutróficas, entre 20 e 50 anos de idade, com tempo de dieta superior a um ano, sem uso de suplementos nem consumo de cigarro ou bebidas alcoólicas e com prática equivalente de atividade física e função tireoideana e hepática normais. Os indivíduos foram divididos conforme o consumo de carne ou não, sendo o grupo vegetariano chamado de grupo “sem carne” (SC) e o onívoro de grupo “com carne” (CC). Foram avaliadas as medidas corporais pelo IMC e bioimpedância. Os seguintes parâmetros laboratoriais foram avaliados: hemograma, ferritina, transferrina, PCR-US, vitamina B12, ácido fólico, homocisteína, glicemia, insulinemia, perfil lipídico, uréia e creatinina, proteína total e frações. Resultados: Foram avaliadas 25 mulheres do grupo CC e 34 SC. O grupo foi homogêneo com relação à idade (p=0,731), IMC (p=0,80) e valor percentual de massa gorda e magra (p=0,693 e p= 0,83; respectivamente). O grupo SC apresentou menores níveis de HOMA-IR (p=0,0048) e HOMA-Beta (p=0,040), além de redução no nível de colesterol total de cerca de 10,4% (p=0,039), mas sem diferenças nos índices de Castelli 1 e 2 (p = 0,619 e p = 0,587; respectivamente). Não houve diferenças nos níveis de hemoglobina (p= 0,13), creatinina (p = 0,113), PCR-US (p =0,754), triglicérides (p = 0,592), ferritina (p=0,221), transferrina (p=0,342), albumina (p=0,137), linfócitos totais (p=0,127), vitamina B12 (p=0,971), ácido fólico (p=1) e homocisteína (p=0,062). Os níveis de uréia dosados foram normais, porém mais elevados no grupo CC (p=0,002). Ambos os grupos apresentaram, sem diferenças estatísticas, valores normal baixo de VCM, HCM, CHCH e ferritina, com RDW normal alto. Conclusões: indivíduos que não utilizam carne têm maior sensibilidade à insulina, níveis mais baixos de colesterol e não têm maior risco de deficiência protéica do que o grupo que a utiliza. Os níveis de uréia mais elevados demonstram maior ingestão protéica do grupo CC, mas sem repercussões clínicas aparentes. Não houve diferença na prevalência de deficiência de ferro, vitamina B12 e ácido fólico, mas os dados sugerem que ambos os grupos têm níveis de ferro e vitamina B12 em limites mínimos da normalidade, sendo indicada a correção medicamentosa. / TEDE / BV UNIFESP: Teses e dissertações

No description available.

This study investigated the effect of vitamin B-12 supplementation on visual response time (VRT). Menstrual cycle phase (MCP) and 24-hour dietary intake of B-12 were also observed as dependent variables. This blind, placebo-controlled trial observed 14 young adult females in four treatment groups: control, 500mcg (low dose), 2000mcg (moderate dose), and 3000mcg (high dose). The study lasted 28 days, with participants treated weekly, randomly assigned to each of the treatment groups. When comparing B-12 dose treatment groups to VRT baseline, there was significant improvements in VRT. Compared to the placebo, there were no significant differences among treatment groups. Significant differences were observed among MCP in two of the four treatment groups. No significant differences were observed in 24-hour intake of B-12 prior to treatment.

<p>Prema podacima iz 2011 godine, u Srbiji je približno 630 000 ljudi (8,6%) obolelo od dijabetes melitus-a, a procenjuje se da će taj broj porasti na 730 000 (10,2%) do 2030 godine. Preko 90% obolelih ima tip 2 dijabetes melitus (T2DM). Prva linija medikamentne terapije predstavljaju bigvanidi čiji je najznačajniji predstavnik metformin. Prema literaturnim podacima, u oko 10-30% sluĉajeva, kontinuirana upotreba metformina ima za posledicu smanjenu intestinalnu apsorpciju vitamina B12. Tačan patofiziolo&scaron;ki mehanizam koji dovodi do metforminom indukovane malapsorpcije vitamina B12 nije u potpunosti ispitan i poznat i postoji nekoliko aktuelnih teorija s ciljem obja&scaron;njenja ovog kompleksnog problema. Cilj rada je bio utvrđivanje nivoa, dinamike, trenda i učestalosti promena vitamina B12, holotranskobalamina (B12 aktiv), homocisteina i folne kiseline tokom kontinuirane primene metformina tokom godinu dana. Studija praćenja je sprovedena u Centru za laboratorijsku medicinu a u saradnji sa Klinikom za endokrinologiju, dijabetes i bolesti metabolizma, Kliničkog centra Vojvodine. Ovom studijom je obuhvaćeno 50 ispitanika obolelih od T2DM a u momentu uvođenja metformina. Svim ispitanicima je određivana koncentracija vitamina B12, B12 aktiva, homocisteina i folne kiseline, u momentu uvođenja terapije kao i nakon 4, 8 i 12 meseci primene metformina. Za dvanaest meseci kontinuirane primene metformina, utvrđen je kontinuirani pad i redukcija vrednosti ukupnog vitamina B12 za 25.29 %, odnosno vrednosti B12 aktiva za 23.26 %. U toku ispitivanja, utvrđen je kontinuirani trend porasta vrednosti homocisteina u krvi, s statistički značajnim porastom vrednosti homocisteina nakon osam meseci primene metformina. Po&scaron;av&scaron;i od predpostavki da metformin istovremeno blokira apsorpciju vitamina B12 u gastrointestinalnom traktu kao i raspoloživost iz postojećih, tkivnih rezervi, zatečene količine ovog vitamina u ciljnim ćelijama se postepeno redukuju i tro&scaron;e, rezultujući krajnjem snižavanju nivoa metabolički aktivnih oblika kobalamina, te posledičnoj akumulaciji homocisteina kako u ćelijskom, tako i u vanćelijskom prostoru. Na osnovu dobijenih rezultata ispitivanja može se predložiti opservacija nivoa ukupnog vitamina B12 i homocisteina u krvi pre uvođenja metformina u terapiju tipa 2 dijabetes melitusa kao i dvanaest meseci nakon toga. Na osnovu nivoa jednogodi&scaron;njeg pada koncentracija ukupnog vitamina B12, porasta koncentracija homocisteina, kao i drugih kliničkih i laboratorijskih parametara, može se razmatrati opcija uvođenja supstitucione terapije vitaminom B12 ili dalja opservacija nivoa vitamin B12 u krvi i ćelijskom prostoru.</p> / <p>According to data from 2011, in Serbia, approximately 630.000 people (8.6%) were diagnosed with diabetes mellitus, and it is estimated that this number will increase to 730.000 (10.2%) by 2030. Over 90% are type 2 diabetes mellitus (T2DM) patients. The first line of medication therapy is metformin. According to the literature data, in about 10-30% of cases, continuous use of metformin causes impared intestinal absorption of vitamin B12. The exact pathophysiological mechanism leading to metformin induced malabsorption of vitamin B12 has not been fully known, and there are several current theories to explain this complex problem. The aim of this study was to determine the level, dynamics, trend and frequency of changes in blood levels of total vitamin B12, holotranscobalamin (B12 active), homocysteine and folic acid during continuous application of metformin, over a year. The study was carried out at the Center of Laboratory Medicine in cooperation with the Clinic for Endocrinology, Diabetes and Metabolic Diseases, Clinical Center of Vojvodina. This study included 50 T2DM patients at the time of the introduction of metformin therapy. Levels of vitamin B12, holotranscobalamin, homocysteine and folic acid are determined before and after 4, 8 and 12 months of metformin administration, to all subjects. After a year of metformin use, the level of total vitamin B12 has been reduced by 25.29%, as well as holotranskobalamin by 23.26%. During the study, a continuous elevation of homocysteine levels was determined, with statistically significant increase in homocysteine values after eight months of metformin administration. Starting from the assumption that metformin blocks the absorption of vitamin B12 in the gastrointestinal tract as well as the availability of existing tissue reserves, the amount of this vitamin in the target cells is gradually reduced, resulting in an extremely low level of metabolically active forms of this vitamin and the consequent accumulation of homocysteine in intracellular and extracellular space. On the basis of the obtained test results, it may suggest observation of the level of total vitamin B12 and homocysteine prior to the introduction of metformin in T2DM therapy and after one year thereafter. Based on the level of one-year decline of total vitamin B12 and the increase of homocysteine concentrations, as well as other clinical and laboratory parameters, substitution therapy with vitamin B12 or further monitoring of laboratory parameters of vitamin B12 metabolism may be proposed.</p>

Methionine dependence, the inability of cells to grow when the amino acid methionine is replaced in culture medium by its metabolic precursor homocysteine, is characteristic of many cancer cell lines. Most cells proliferate normally under these conditions. The methionine dependent tumorigenic human melanoma cell line MeWo-LC1 was derived from the methionine independent non-tumorigenic line MeWo. The MeWo-LC1 cell line has been shown to have a cellular phenotype similar to that of cells from patients with the cblC inborn error of cobalamin metabolism, with decreased synthesis of cobalamin coenzymes and decreased activity of the cobalamin dependent enzymes methionine synthase and methylmalonyl-CoA mutase. Inability of cblC cells to complement the defect in cobalamin metabolism in MeWo-LC1 suggested that the defect was caused by decreased activity of the MMACHC gene product. However, no potentially disease causing mutations could be detected in the coding sequence of MMACHC in MeWo-LC1. No MMACHC expression could be detected in MeWo-LC1, and there was virtually complete methylation of a CpG island at the 5' end of the MMACHC gene in MeWo-LC1, consistent with inactivation of the gene by methylation; the CpG island was partially methylated in MeWo and only lightly methylated in control fibroblasts. Transfection of MeWo-LC1 with wild type MMACHC with a constitutive promoter resulted in correction of the defect in cobalamin metabolism and restoration of the ability of cells to grow in medium containing homocysteine. We conclude that epigenetic inactivation of the MMACHC gene is responsible for methionine dependence in MeWo-LC1.

Diss. (sammanfattning) Stockholm : Karolinska institutet, 2007. / Härtill 4 uppsatser.

Catosal ist ein Produkt, das weit verbreitet zur Behandlung von sekundären Keto-sen sowie zu Gebärpareseprophylaxe und Behandlung von Fruchtbarkeitsstörungen eingesetzt wird. Zielstellung: Ziel dieser Studie war es, in zwei Versuchsanordnungen (Studie 1 und Studie 2) zu prüfen, ob Catosal Einfluss auf den klinischen Allgemeinzustand und den Stoffwechsel von Milchkühen in Phasen hoher Belastung nimmt. Versuchsanordnung: Studie 1: Es wurden 30 Kühe mit linksseitiger Dislocatio a-bomasi aus dem Patientengut der Medizinischen Tierklinik Leipzig untersucht. Diese wurden alternierend den beiden Gruppen VG 1 und KG 1 zugeteilt. Der VG 1 wurde vor der Operation 25 ml Catosal intravenös verabreicht. Die KG 1 diente zur Kon-trolle und blieb unbehandelt. In den darauffolgenden Untersuchungen wurden der klinische Allgemeinzustand sowie klinisch-chemische und weitere Parameter unter-sucht. Studie 2: In die Studie wurden 79 Kühe im peripartalen Zeitraum aus einem Milchviehbetrieb in der Nähe von Leipzig einbezogen. Diese wurden alternierend drei Gruppen zugeordnet. VG 2 (n=26) wurde 10 d ante partum (ap) und 3 d post partum (pp) je 25 ml Catosal subcutan (s.c.) verabreicht. Der VG 3 (n=28) wurden 3 d pp und 5-7 d pp je 25 ml Catosal s.c. verabreicht. Die KG 2 (n=25) diente zur Kontrolle und blieb unbehandelt. Jede der drei Gruppen hatte einen Anteil von je 10 Färsen. Das Untersuchungsspektrum wurde anhand der Ergebnisse des ersten Ansatzes modifiziert. Ergebnisse Studie 1: Zwischen VG 1 und KG 1 wurden folgende Unterschiede fest-gestellt: 1) Der klinische Allgemeinzustand verbesserte sich in der VG 1. Dies ließ sich anhand der signifikanten Unterschiede (p<0,05) bei Futteraufnahme und Wie-derkauverhalten (WKV) feststellen. Die Entwicklung der Puls (PF)- und Atemfre-quenzen (AF) in der VG 1 zeigte ein tendenziell (0,1>p>0,05) früheres Erreichen des physiologischen Bereichs. 2) Der Energie-Leber-Stoffwechsel zeigte für die VG 1 ei-ne günstigere Entwicklung. Dies wurde anhand des postoperativen Verlaufs der kli-nisch-chemischen Parameter ß-Hydroxybutyrat (BHB), Glucose, freie Fettsäuren (FFS), Bilirubin, Aspartat-Aminotransferase (ASAT), Glutamat-Dehydrogenase (GLDH), Creatinkinase (CK) und Harnstoff deutlich, wobei für BHB, FFS, ASAT so-wie CK signifikant (p<0,05) geringere Konzentrationen/Aktivitäten in der VG 1 bestanden. Die Gruppenunterschiede von Glucose, Bilirubin und GLDH waren nicht signifikant. 3) Die Vormagenmotorik verbesserte sich post op (0,1>p>0,05). Dies spiegelte sich in der für die VG 1 zeitweise (8 h; 10 h pp: p<0,05) signifikant höheren Pansenmotorik wider. 4) Der Rückgang der Bluteisenkonzentration fiel in der VG 1 post op nicht so stark wie in der KG 1 aus und lag 24 h post op signifikant (p<0,05) über jener der KG 1. Ergebnisse Studie 2: Folgende Unterschiede konnten zwischen den Versuchsgrup-pen VG 2 und VG 3 sowie der KG 2 festgestellt werden: 5) Die Parameter des Stoff-wechsels und des klinischen Allgemeinzustands befanden sich während des gesam-ten Untersuchungszeitraums in allen drei Gruppen im physiologischen Bereich. 6) Die Parameter des Energie-Fettstoffwechsels lagen im physiologischen Bereich und zeigten keine klinisch relevanten Unterschiede zwischen den Gruppen. 7) Körperin-nentemperatur (T), PF sowie AF lagen in der Gruppe VG 23 d pp signifikant (p<0,05) unter denen der VG 3 und KG 2, in allen drei Gruppen jedoch innerhalb des physio-logischen Bereiches. 8) Bei den Mineralstoffen Eisen und Calcium (Ca) konnten in der Gruppe VG 2 3 d pp signifikant (p<0,05) höhere Konzentrationen im Blut be-stimmt werden, wobei bei Ca die geringere Milchleistung der VG 2 berücksichtigt werden musste. 9) Die geringgradig höhere Leukozytenzahl sowie die zeitweise sig-nifikant (3 d pp: VG 2:VG 3: p<0,05) geringere Konzentration an Albumin bei gleicher Gesamteiweißkonzentration im Blut ergaben einen Hinweis auf eine Verbesserung der unspezifischen Immunabwehr. 10) Die Milchleistung der VG 3 lag 45 d pp signifi-kant (p<0,05) über der von VG 2 und KG 2. Auch 100 d pp bestand dieser Unter-schied noch. 11) Die Erstbesamung fand in der VG 2 und VG 3 früher als bei der KG 2 statt (0,1>p>0,05). Bei den Kühen war der Unterschied jedoch signifikant (VG 3:KG 2: p<0,05). Schlussfolgerung: Eine Beeinflussbarkeit einzelner Aspekte des Stoffwechsels sowie des klinischen Allgemeinzustands durch Catosal konnte mit der Studie 1 belegt werden. Bezüglich der Einflüsse von Catosal auf die Leistungsfähigkeit, den Stoffwechsel und den klinischen Allgemeinzustand im peripartalen Zeitraum sind die Ergebnisse in ihrer Gesamtheit nicht eindeutig und bedürfen weiterer Untersuchungen.

No description available.

Realizou-se um estudo descritivo conduzido no Hospital de Clínicas de Porto Alegre, no período de outubro de 2001 a outubro de 2002, com pacientes HIV positivos e anêmicos. Objetivo: avaliar a associação entre anemia e o perfil nutricional em uma amostra de pacientes HIV+ . Métodos: Foram incluídos 34 pacientes maiores de 18 anos, sendo todos pacientes diagnosticados com anemia. Foram analisados exames laboratoriais, avaliação da ingestão alimentar (recordatório alimentar de 24h), freqüência alimentar e coleta dos parâmetros antropométricos dos pacientes. Resultados: O recordatório alimentar de 24 horas demonstrou a deficiência na ingestão de folato pela maioria dos pacientes; enquanto que vitamina B12 e ferro estiveram de acordo com as RDA’s. Conclusão: A causa da anemia nestes pacientes talvez não tenha sido em função desta deficiente ingestão de folato, ainda mais por se tratar de um estudo descritivo. Ressalta-se a importância do profissional para o acompanhamento nutricional destes pacientes, para a promoção de um adequado estado nutricional e qualidade de vida. / Was develop a descritive study conducted in the Porto Alegre Clinics’ Hospital, from october 2001 to October 2002, with positive HIV and anemics patients. Objectives: Evaluate the association between anemia and nutritional status in positive HIV patients. Methodology: Were included 34 patients under 18 years old, all diagnosed with anemia. Laboratorial exams, evaluation of food intake (24h register), questionary of food intake frequence and anthropometrics data were collected. Results: The 24h register food intake showed the deficiency in folate intake by most of patients ,while vitamine B12 and iron intake were accorded RDA’s. Conclusions: The etiology of anemia in these patients maybe wasn´t cause by this folate deficiency, also because this was a describe study. The presence of a professional appears to be important for the nutritional treatment of these patients, to develop a health nutrional status and quality of life.

Realizou-se um estudo descritivo conduzido no Hospital de Clínicas de Porto Alegre, no período de outubro de 2001 a outubro de 2002, com pacientes HIV positivos e anêmicos. Objetivo: avaliar a associação entre anemia e o perfil nutricional em uma amostra de pacientes HIV+ . Métodos: Foram incluídos 34 pacientes maiores de 18 anos, sendo todos pacientes diagnosticados com anemia. Foram analisados exames laboratoriais, avaliação da ingestão alimentar (recordatório alimentar de 24h), freqüência alimentar e coleta dos parâmetros antropométricos dos pacientes. Resultados: O recordatório alimentar de 24 horas demonstrou a deficiência na ingestão de folato pela maioria dos pacientes; enquanto que vitamina B12 e ferro estiveram de acordo com as RDA’s. Conclusão: A causa da anemia nestes pacientes talvez não tenha sido em função desta deficiente ingestão de folato, ainda mais por se tratar de um estudo descritivo. Ressalta-se a importância do profissional para o acompanhamento nutricional destes pacientes, para a promoção de um adequado estado nutricional e qualidade de vida. / Was develop a descritive study conducted in the Porto Alegre Clinics’ Hospital, from october 2001 to October 2002, with positive HIV and anemics patients. Objectives: Evaluate the association between anemia and nutritional status in positive HIV patients. Methodology: Were included 34 patients under 18 years old, all diagnosed with anemia. Laboratorial exams, evaluation of food intake (24h register), questionary of food intake frequence and anthropometrics data were collected. Results: The 24h register food intake showed the deficiency in folate intake by most of patients ,while vitamine B12 and iron intake were accorded RDA’s. Conclusions: The etiology of anemia in these patients maybe wasn´t cause by this folate deficiency, also because this was a describe study. The presence of a professional appears to be important for the nutritional treatment of these patients, to develop a health nutrional status and quality of life.