RESUMO
Oxidative stress has been considered the main contributor to liver injury. Dietary antioxidants would be expected to improve liver function. The hepatoprotective effects of antioxidants are controversial. In the present study, the associations of some dietary antioxidants and the levels of serum liver enzymes were examined. This cross-sectional study was conducted using the Rafsanjan Cohort Study (RCS) data as a population-based prospective cohort which is a part of the Prospective Epidemiological Research Studies in IrAN (PERSIAN). A total of 9942 participants aged 35-70 years old were included in this study. Among this population, 4631 (46.59%) were male, and 5311 (53.42%) were female. Dietary intakes were collected by a validated food frequency questionnaire (FFQ) with 128 items. Aspartate transaminase (AST), Alanine transaminase (ALT), γ-glutamyl transferase (GGT), and Alkaline phosphatase (ALP) were measured by a biotecnica analyzer. Dichotomous logistics regression models were used to investigate the association between the elevated liver enzymes and intake of dietary antioxidants using crude and adjusted models. In the adjusted model, in subjects with higher consumption of Se, Vit A, Vit E, ß-carotene, α-carotene, and ß-cryptoxanthin, the odds ratios of elevated ALP were decreased compared to the reference group (ORs 0.79 (0.64-0.96), 0.80 (0.66-0.98), 0.73 (0.60-0.89), 0.79 (0.64-0.96), 0.78 (0.64-0.95), 0.80 (0.66-0.98), and 0.79 (0.64-0.98), respectively). Subjects with higher consumption of Se, Vit A, Vit E, and provitamin A carotenoids (ß-carotene, α-carotene, ß-cryptoxanthin) showed decreased odds of elevated ALP. These findings support the hypothesis that Se, Vit A, Vit E, and provitamin A carotenoids may be associated with improvements in ALP and act as suppressors against the development of liver injury.
Assuntos
Antioxidantes , beta Caroteno , Masculino , Humanos , Feminino , Adulto , Pessoa de Meia-Idade , Idoso , Antioxidantes/farmacologia , beta Caroteno/farmacologia , Estudos de Coortes , Estudos Prospectivos , beta-Criptoxantina , Provitaminas/farmacologia , Estudos Transversais , Irã (Geográfico) , Carotenoides/farmacologia , Vitamina E/farmacologia , Fígado , Vitamina A/farmacologia , Alanina TransaminaseRESUMO
Influenza, a seasonal acute respiratory disease caused primarily by the influenza virus A or B, manifests with severe symptoms leading to considerable morbidity and mortality and is a major concern worldwide. Therefore, effective preventive measures against it are required. The aim of this trial was to evaluate the preventive effects of heat-killed Levilactobacillus brevis KB290 (KB290) in combination with ß-carotene (ßC) on influenza virus infections in healthy Japanese subjects aged between 20 and 59 y throughout the winter season. We performed a randomized, double-blind, placebo-controlled, parallel-group trial from 16 December 2019 to 8 March 2020, comparing KB290 + ßC beverage with placebo beverage. The primary endpoint was the incidence of influenza based on a doctor's certificate. The incidence of influenza was not significantly different between the two groups. However, the subgroup analysis showed a significant difference between the two groups (influenza incidence: the KB290 + ßC group 1.9%, and the placebo group 3.9%) in the subgroup of subjects aged Ë40 y, but not in the subgroup of subjects aged ≥40 y. The results of this trial suggest that the combination of KB290 and ßC might be a possible candidate supplement for protection against the seasonal influenza virus infection in humans aged <40 y, although further clinical studies are needed to confirm the concrete preventive effect of this combination on influenza.
Assuntos
Influenza Humana/prevenção & controle , Levilactobacillus brevis , Provitaminas/farmacologia , beta Caroteno/farmacologia , Adulto , Método Duplo-Cego , Feminino , Temperatura Alta , Humanos , Japão , Masculino , Pessoa de Meia-Idade , Adulto JovemRESUMO
ß-Carotene displays antioxidant and anti-inflammatory activities and prevents the development of cancer. Ulcerative colitis (UC) is a kind of inflammatory bowel disease that is accompanied by a certain risk of colon cancer. However, the role of ß-carotene in the modulation of gut microbiota and UC improvement is unclear. In this research, the properties of ß-carotene on anti-inflammatory and the composition of gut microbiota were evaluated in a rat model of UC induced by dextran sulfate sodium (DSS). The results revealed that ß-carotene significantly (p < 0.05) decreased the severity of colitis in rats, as assessed using body weight (6.00 ± 1.73%), colon length (22.23 ± 0.53%), and disease activity index, and improved the structure of the colon damaged. Moreover, colonic levels of proinflammatory cytokines were significantly lower following ß-carotene supplementation. ß-Carotene intervention also lowered the expression levels of phosphorylated p65 (0.60 ± 0.02), p38 (0.57 ± 0.00), Erk (0.63 ± 0.04), and JNK (0.70 ± 0.00). The result of the relative abundance of gut microbiota showed that DSS administration significantly changed the microbial structure at the phylum and genus levels of rats. Furthermore, ß-carotene treatment significantly increased the abundance of Faecalibacterium, the levels of which negatively correlated with the levels of inflammatory cytokines. Faecalibacterium may be a potential target in the alleviation of DSS-induced UC. ß-Carotene can alleviate DSS-induced UC through the regulation of gut microbiota. This study provides a reference for the rational use of ß-carotene in the treatment of UC. PRACTICAL APPLICATION: ß-Carotene can relieve ulcerative colitis and regulate the gut microbiota; the nutritional intervention of ß-carotene enhancing animal health.
Assuntos
Anti-Inflamatórios/farmacologia , Colite Ulcerativa/tratamento farmacológico , Sulfato de Dextrana/toxicidade , Modelos Animais de Doenças , Microbioma Gastrointestinal/efeitos dos fármacos , beta Caroteno/farmacologia , Animais , Colite Ulcerativa/induzido quimicamente , Colite Ulcerativa/microbiologia , Citocinas/metabolismo , Masculino , Provitaminas/farmacologia , Ratos , Ratos Sprague-DawleyRESUMO
Vitamin A is a family of derivatives synthesized from carotenoids acquired from the diet and can be converted in animals to bioactive forms essential for life. Vitamin A1 (all-trans-retinol/ATROL) and provitamin A1 (all-trans-ß,ß-carotene/ATBC) are precursors of all-trans-retinoic acid acting as a ligand for the retinoic acid receptors. The contribution of ATROL and ATBC to formation of 9-cis-13,14-dihydroretinoic acid (9CDHRA), the only endogenous retinoid acting as retinoid X receptor (RXR) ligand, remains unknown. To address this point novel and already known retinoids and carotenoids were stereoselectively synthesized and administered in vitro to oligodendrocyte cell culture and supplemented in vivo (orally) to mice with a following high-performance liquid chromatography-mass spectrometry (HPLC-MS)/UV-Vis based metabolic profiling. In this study, we show that ATROL and ATBC are at best only weak and non-selective precursors of 9CDHRA. Instead, we identify 9-cis-13,14-dihydroretinol (9CDHROL) and 9-cis-13,14-dihydro-ß,ß-carotene (9CDHBC) as novel direct nutritional precursors of 9CDHRA, which are present endogenously in humans and the human food chain matrix. Furthermore, 9CDHROL displayed RXR-dependent promnemonic activity in working memory test similar to that reported for 9CDHRA. We also propose that the endogenous carotenoid 9-cis-ß,ß-carotene (9CBC) can act as weak, indirect precursor of 9CDHRA via hydrogenation to 9CDHBC and further metabolism to 9CDHROL and/or 9CDHRA. In summary, since classical vitamin A1 is not an efficient 9CDHRA precursor, we conclude that this group of molecules constitutes a new class of vitamin or a new independent member of the vitamin A family, named "Vitamin A5/X".
Assuntos
Receptores X de Retinoides/efeitos dos fármacos , Transdução de Sinais/efeitos dos fármacos , Tretinoína/análogos & derivados , Vitaminas/farmacologia , Animais , Células Cultivadas , Cromatografia Gasosa-Espectrometria de Massas , Humanos , Masculino , Memória de Curto Prazo/efeitos dos fármacos , Camundongos , Camundongos Endogâmicos C57BL , Oligodendroglia/efeitos dos fármacos , Provitaminas/análise , Provitaminas/síntese química , Provitaminas/farmacologia , Tretinoína/farmacologia , Vitamina A/análogos & derivados , Vitamina A/metabolismo , Vitaminas/análise , Vitaminas/síntese químicaRESUMO
Lumisterol (L3) is a stereoisomer of 7-dehydrocholesterol and is produced through the photochemical transformation of 7-dehydrocholesteol induced by high doses of UVB. L3 is enzymatically hydroxylated by CYP11A1, producing 20(OH)L3, 22(OH)L3, 20,22(OH)2L3, and 24(OH)L3. Hydroxylumisterols function as reverse agonists of the retinoic acid-related orphan receptors α and γ (RORα/γ) and can interact with the non-genomic binding site of the vitamin D receptor (VDR). These intracellular receptors are mediators of photoprotection and anti-inflammatory activity. In this study, we show that L3-hydroxyderivatives significantly increase the expression of VDR at the mRNA and protein levels in keratinocytes, both non-irradiated and after UVB irradiation. L3-hydroxyderivatives also altered mRNA and protein levels for RORα/γ in non-irradiated cells, while the expression was significantly decreased in UVB-irradiated cells. In UVB-irradiated keratinocytes, L3-hydroxyderivatives inhibited nuclear translocation of NFκB p65 by enhancing levels of IκBα in the cytosol. This anti-inflammatory activity mediated by L3-hydroxyderivatives through suppression of NFκB signaling resulted in the inhibition of the expression of UVB-induced inflammatory cytokines, including IL-17, IFN-γ, and TNF-α. The L3-hydroxyderivatives promoted differentiation of UVB-irradiated keratinocytes as determined from upregulation of the expression at the mRNA of involucrin (IVL), filaggrine (FLG), and keratin 14 (KRT14), downregulation of transglutaminase 1 (TGM1), keratins including KRT1, and KRT10, and stimulation of ILV expression at the protein level. We conclude that CYP11A1-derived hydroxylumisterols are promising photoprotective agents capable of suppressing UVB-induced inflammatory responses and restoring epidermal function through targeting the VDR and RORs.
Assuntos
Ergosterol/farmacologia , Queratinócitos/efeitos dos fármacos , Provitaminas/farmacologia , Tolerância a Radiação , Raios Ultravioleta , Células Cultivadas , Enzima de Clivagem da Cadeia Lateral do Colesterol/metabolismo , Ergosterol/análogos & derivados , Proteínas Filagrinas , Humanos , Interferon gama/genética , Interferon gama/metabolismo , Queratinócitos/metabolismo , Queratinócitos/efeitos da radiação , Queratinas/genética , Queratinas/metabolismo , NF-kappa B/genética , NF-kappa B/metabolismo , Membro 3 do Grupo F da Subfamília 1 de Receptores Nucleares/genética , Membro 3 do Grupo F da Subfamília 1 de Receptores Nucleares/metabolismo , Receptores de Calcitriol/genética , Receptores de Calcitriol/metabolismo , Transglutaminases/genética , Transglutaminases/metabolismo , Fator de Necrose Tumoral alfa/genética , Fator de Necrose Tumoral alfa/metabolismoRESUMO
OBJECTIVE: The NLRP3 inflammasome is closely linked to the pathophysiology of a wide range of inflammatory diseases. This study was undertaken to identify small molecules that directly bind to NLRP3 in order to develop pharmacologic interventions for NLRP3-related diseases. METHODS: A structure-based virtual screening analysis was performed with ~62,800 compounds to select efficient NLRP3 inhibitors. The production of caspase 1-p10 and interleukin-1ß (IL-1ß) was measured by immunoblotting and enzyme-linked immunosorbent assay to examine NLRP3 inflammasome activation. Two gouty arthritis models and an air pouch inflammation model induced by monosodium urate monohydrate (MSU) crystal injection were used for in vivo experiments. Primary synovial fluid cells from gout patients were used to determine the relevance of NLRP3 inflammasome inhibition in human gout. RESULTS: Beta-carotene (provitamin A) suppressed the NLRP3 inflammasome activation induced by various activators, including MSU crystals, in mouse bone marrow-derived primary macrophages (P < 0.05). Surface plasmon resonance analysis demonstrated the direct binding of ß-carotene to the pyrin domain (PYD) of NLRP3 (KD = 3.41 × 10-6 ). Molecular modeling and mutation assays revealed the interaction mode between ß-carotene and the NLRP3 PYD. Inflammatory symptoms induced by MSU crystals were attenuated by oral administration of ß-carotene in gouty arthritis mouse models (P < 0.05), correlating with its suppressive effects on the NLRP3 inflammasome in inflamed tissues. Furthermore, ß-carotene reduced IL-1ß secretion from human synovial fluid cells isolated from gout patients (P < 0.05), showing its inhibitory efficacy in human gout. CONCLUSION: Our results present ß-carotene as a selective and direct inhibitor of NLRP3, and the binding of ß-carotene to NLRP3 PYD as a novel pharmacologic strategy to combat NLRP3 inflammasome-driven diseases, including gouty arthritis.
Assuntos
Artrite Gotosa/imunologia , Inflamassomos/antagonistas & inibidores , Inflamação/imunologia , Macrófagos/efeitos dos fármacos , Proteína 3 que Contém Domínio de Pirina da Família NLR/efeitos dos fármacos , Provitaminas/farmacologia , beta Caroteno/farmacologia , Animais , Caspase 1/efeitos dos fármacos , Caspase 1/imunologia , Modelos Animais de Doenças , Ensaio de Imunoadsorção Enzimática , Gota/imunologia , Humanos , Inflamassomos/imunologia , Inflamassomos/metabolismo , Interleucina-1beta/efeitos dos fármacos , Interleucina-1beta/imunologia , Macrófagos/imunologia , Camundongos , Simulação de Acoplamento Molecular , Proteína 3 que Contém Domínio de Pirina da Família NLR/antagonistas & inibidores , Proteína 3 que Contém Domínio de Pirina da Família NLR/imunologia , Proteína 3 que Contém Domínio de Pirina da Família NLR/metabolismo , Domínio Pirina , Ressonância de Plasmônio de Superfície , Líquido Sinovial/citologiaRESUMO
Gamma-linolenic acid (GLA) is a fatty acid from the ω-6 family. It is able to deliver a wide range of health benefits arising from its anti-inflammatory effects. An insufficient supply of GLA from agricultural and animal sources resulted in the development of a fermentation technique using lower filamentous fungi, which have the ability to accumulate high concentrations of GLA and beta-carotene during solid-state fermentation of cereals. The goal of this study was to observe the influence of the addition of prefermented cereal product, containing high amounts of GLA and beta-carotene, into the feed of broiler chickens on their immune status, and also the number of lactic acid bacteria and enterobacteria in gut content, which has never been studied before. Immunostimulation in the GLA group was manifested by a significant increase in the oxidative burst of phagocytes, CD4+CD8- lymphocytes in blood, and the CD4: CD8 ratio. Upregulation of gene expression for IgA in the GLA group indicates that the B-lymphocytes were stimulated at a local gut level. In the caecum, increased mRNA expression for mucin-2 and insulin-like growth factor was observed in the GLA group, which could contribute mainly to the protection of the intestinal mucosa and to better growth and regeneration of skeletal muscles. Improved immune activation and protection of the intestinal mucosa were subsequently reflected in a change of the microbial composition in gut contents; a significant reduction of enterobacteria occurred after GLA administration. We can conclude that prefermented cereals containing fungal GLA and beta-carotene represent a low-cost supplement for broiler diet having a beneficial health effect.
Assuntos
Galinhas/fisiologia , Trato Gastrointestinal/efeitos dos fármacos , Imunidade Inata/efeitos dos fármacos , Provitaminas/farmacologia , beta Caroteno/farmacologia , Ácido gama-Linolênico/administração & dosagem , Ração Animal/análise , Animais , Galinhas/crescimento & desenvolvimento , Galinhas/imunologia , Dieta/veterinária , Suplementos Nutricionais/análise , Grão Comestível , Fermentação , Fungos/metabolismo , MasculinoRESUMO
Vegetables and fruits contain non-provitamin A (lycopene, lutein, and zeaxanthin) and provitamin A (ß-carotene, ß-cryptoxanthin, and α-carotene) carotenoids. Within these compounds, ß-carotene has been extensively studied for its health benefits, but its supplementation at doses higher than recommended intakes induces adverse effects. ß-Carotene is converted to retinoic acid (RA), a well-known immunomodulatory molecule. Human interventions suggest that ß-carotene and lycopene at pharmacological doses affect immune functions after a depletion period of low carotenoid diet. However, these effects appear unrelated to carotenoids and retinol levels in plasma. Local production of RA in the gut-associated lymphoid tissue, as well as the dependency of RA-induced effects on local inflammation, suggests that personalized nutrition/supplementation should be considered in the future. On the other hand, the differential effect of RA and lycopene on transforming growth factor-beta suggests that lycopene supplementation could improve immune functions without increasing risk for cancers. However, such preclinical evidence must be confirmed in human interventions before any recommendations can be made.
Assuntos
Carotenoides/química , Dieta , Provitaminas/química , Disponibilidade Biológica , Carotenoides/metabolismo , Carotenoides/farmacologia , Humanos , Sistema Imunitário/efeitos dos fármacos , Sistema Imunitário/metabolismo , Provitaminas/metabolismo , Provitaminas/farmacologia , Recomendações Nutricionais , Índice Terapêutico , Xantofilas/química , Xantofilas/metabolismoRESUMO
The retinoid cycle enzymes regenerate the visual chromophore 11-cis retinal to enable vision. Mutations in the genes encoding the proteins of the retinoid cycle are the leading cause for recessively inherited retinal dystrophies such as retinitis pigmentosa, Leber congenital amaurosis, congenital cone-rod dystrophy and fundus albipunctatus. Currently there is no treatment for these blinding diseases. In previous studies we demonstrated that oral treatment with the 9-cis-ß-carotene rich Dunaliella Bardawil algae powder significantly improved visual and retinal functions in patients with retinitis pigmentosa and fundus albipunctatus. Here we developed a convenient and economical synthetic route for biologically active 9-cis-ß-carotene from inexpensive building materials and demonstrated that the molecule is stable for at least one month. Synthetic 9-cis-ß-carotene rescued cone photoreceptors from degeneration in eye cup cultures of mice with a retinoid cycle genetic defect. This study suggests that synthetic 9-cis-ß-carotene may serve as an effective treatment for retinal dystrophies involving the retinoid cycle.
Assuntos
Células Fotorreceptoras de Vertebrados/efeitos dos fármacos , Provitaminas/farmacologia , beta Caroteno/farmacologia , Animais , Células Cultivadas , Técnicas de Química Sintética/métodos , Modelos Animais de Doenças , Camundongos , Provitaminas/síntese química , Provitaminas/química , Degeneração Retiniana/tratamento farmacológico , Doenças Retinianas/tratamento farmacológico , Retinose Pigmentar/tratamento farmacológico , beta Caroteno/síntese química , beta Caroteno/químicaAssuntos
Proteínas Sanguíneas/metabolismo , Favismo/tratamento farmacológico , Testículo/efeitos dos fármacos , Vicia faba/efeitos adversos , beta Caroteno/uso terapêutico , Animais , Células Sanguíneas/efeitos dos fármacos , Deficiência de Glucosefosfato Desidrogenase/complicações , Deficiência de Glucosefosfato Desidrogenase/tratamento farmacológico , Masculino , Provitaminas/farmacologia , Provitaminas/uso terapêutico , Ratos Sprague-Dawley , beta Caroteno/farmacologiaRESUMO
The present study was to evaluate the effect of ergosterol (ER) on CS (cigarette smoke)-induced chronic obstructive pulmonary disease (COPD) in mice. Fifty male ICR mice were randomly assigned to five groups: control group, CS group, CS + dexamethasone (Dex, 2 mg/kg) group, CS + ER (ER, 25 mg/kg) group, CS + ER (ER, 50 mg/kg). H&E staining demonstrated that ER inhibited CS-induced pathological injury in lung tissue. Besides, ER could restore the activities of superoxide dismutase (SOD) in serum and in the lung, catalase (CAT) in serum and reduce the content of malondialdehyde (MDA) in serum and in the lung. ER also inhibited pro-inflammatory cytokines including tumor necrosis factor-α (TNF-α), interleukin-6 (IL-6), and interleukin-1ß (IL-1ß) in serum and the lung. Furthermore, ER significantly inhibited the protein expression of JAK3/STAT3/NF-κB pathway in CS-induced mice. Our findings suggested that ER might effectively ameliorate the progression of COPD via JAK3/STAT3/NF-κB pathway in mice.
Assuntos
Ergosterol/farmacologia , Lesão Pulmonar/prevenção & controle , Doença Pulmonar Obstrutiva Crônica/tratamento farmacológico , Transdução de Sinais/efeitos dos fármacos , Animais , Fumar Cigarros/efeitos adversos , Ergosterol/uso terapêutico , Janus Quinase 3/metabolismo , Lesão Pulmonar/tratamento farmacológico , Masculino , Camundongos , Camundongos Endogâmicos ICR , NF-kappa B/metabolismo , Provitaminas/farmacologia , Fator de Transcrição STAT3/metabolismoRESUMO
AIMS: ß-Carotene is a natural anti-oxidant, which has been used for treatment of cancer and cardiovascular diseases. Recently, the ameliorating function of ß-carotene in osteoporosis has been implicated. However, the precise mechanism of ß-carotene in prevention and treatment of osteoporosis is largely unknown. In the present study, we aimed to elucidate how ß-carotene affects osteoclast formation and bone resorption. MAIN METHODS: Bone marrow-derived monocytes/-macrophages (BMM) were exposed to 0.05, 0.1, 0.2, 0.4 and 0.6µM ß-carotene, followed by evaluation of cell viability, lactate dehydrogenase (LDH) release, receptor activator of nuclear factor kappa B ligand (RANKL)-induced osteoclastogenesis and resorption pits formation. Key factors in nuclear factor kappa B (NF-ĸB) and mitogen-activated protein kinases (MAPK) pathways were evaluated with western blot after BMM cells were exposed to RANKL and ß-carotene. The effects of ß-carotene in nuclear factor of activated T-cells cytoplasmic 1 (NFATc1), c-Fos and cathepsin K (CTSK) expression were also evaluated. KEY FINDINGS: ß-Carotene significantly inhibited BMM viability and promoted LDH release at concentrations of 0.4 and 0.6µM. A decrease in RANKL-induced osteoclastogenesis and resorption was also observed after ß-carotene treatment. ß-Carotene attenuated the NF-ĸB pathway activation by RANKL, with no effect on MAPK pathway. ß-Carotene suppressed the upregulation of NFATc1 and c-Fos by RANKL. SIGNIFICANCE: We clarified the anti-osteoclastogenic role of ß-carotene, which is mediated by NF-κB signaling.
Assuntos
Reabsorção Óssea/prevenção & controle , Macrófagos/citologia , Monócitos/citologia , NF-kappa B/antagonistas & inibidores , Osteoclastos/citologia , Osteogênese/efeitos dos fármacos , beta Caroteno/farmacologia , Animais , Western Blotting , Diferenciação Celular , Sobrevivência Celular/efeitos dos fármacos , Células Cultivadas , Macrófagos/efeitos dos fármacos , Macrófagos/metabolismo , Camundongos , Camundongos Endogâmicos BALB C , Monócitos/efeitos dos fármacos , Monócitos/metabolismo , NF-kappa B/metabolismo , Osteoclastos/efeitos dos fármacos , Osteoclastos/metabolismo , Osteogênese/fisiologia , Provitaminas/farmacologia , Transdução de SinaisRESUMO
BACKGROUND: Vitamin A deficiency remains a nutritional concern in sub-Saharan Africa. Conventionally bred maize hybrids with high provitamin A carotenoid concentrations may have the potential to improve vitamin A status in maize-consuming populations. OBJECTIVE: We evaluated the efficacy of regular provitamin A carotenoid-biofortified "orange" maizemeal (â¼15 µg ß-carotene/g) consumption in improving vitamin A status and reducing vitamin A deficiency in children. DESIGN: This was a cluster-randomized controlled trial in the rural farming district of Mkushi, Zambia. All 4- to 8-y-old children in an â¼400-km(2) area were identified and grouped by proximity into clusters of â¼15-25 children. We randomly assigned clusters to 1) orange maizemeal (n = 25), 2) white maizemeal (n = 25), or 3) a parallel, nonintervention group (n = 14). Children in intervention clusters (n = 1024) received 200 g maizemeal for 6 d/wk over 6 mo; the maizemeal was prepared according to standardized recipes and served in cluster-level kitchens. Staff recorded attendance and leftovers. We collected venous blood before and after the intervention to measure serum retinol, ß-carotene, C-reactive protein, and α1-acid glycoprotein. RESULTS: Intervention groups were comparable at baseline, and vitamin A status was better than anticipated (12.1% deficient on the basis of serum retinol <0.7 µmol/L). Although attendance at meals did not differ (85%), median daily maize intake was higher in white (154 g/d) than in orange (142 g/d) maizemeal clusters. At follow-up, mean serum ß-carotene was 0.14 µmol/L (95% CI: 0.09, 0.20 µmol/L) higher in orange maizemeal clusters (P < 0.001), but mean serum retinol (1.00 ± 0.33 µmol/L overall) and deficiency prevalence (17.1% overall) did not differ between arms. CONCLUSION: In this marginally nourished population, regular biofortified maizemeal consumption increased serum ß-carotene concentrations but did not improve serum retinol. This trial was registered at clinicaltrials.gov as NCT01695148.
Assuntos
Dieta , Grão Comestível , Alimentos Fortificados , Provitaminas/farmacologia , Vitamina A/sangue , Zea mays , beta Caroteno/farmacologia , Proteína C-Reativa/metabolismo , Criança , Pré-Escolar , Feminino , Humanos , Masculino , Estado Nutricional , Provitaminas/sangue , Provitaminas/uso terapêutico , População Rural , Resultado do Tratamento , Deficiência de Vitamina A/sangue , Deficiência de Vitamina A/dietoterapia , Deficiência de Vitamina A/tratamento farmacológico , Zâmbia , beta Caroteno/sangue , beta Caroteno/uso terapêuticoRESUMO
INTRODUCTION: Due to the high prevalence of vitamin D deficiency, strategies are needed to improve vitamin D status. Food components can affect vitamin D metabolism and have to be considered when estimating the efficacy of vitamin D supplements. 7-dehydrocholesterol (7-DHC) occurs naturally in food, but its impact on vitamin D metabolism has not yet been examined. METHODS: Three groups of male C57BL/6 mice (n=12 per group) were placed on a diet that contained 0, 2.5 or 5mg 7-DHC per kg diet over a period of 6 weeks. Vitamin D and other sterols in the serum, skin, liver and kidney were quantified by LC-MS/MS. The relative mRNA abundance of hepatic genes encoding vitamin D hydroxylation enzymes and transporters was analyzed by real-time RT-PCR. RESULTS: We found a substantial dose-dependent increase of non-hydroxylated vitamin D3 in the liver and kidney of mice fed a diet containing 7-DHC. The vitamin D3 content in the liver was 2.80±0.61pmol/g, 7.34±4.28pmol/g and 12.9±3.58pmol/g in groups that received 0, 2.5 and 5mg/kg 7-DHC, respectively. In the kidney, the vitamin D3 content of these groups was 1.78±1.17pmol/g, 3.55±1.06 and 6.36±2.29pmol/g, respectively. The serum and tissue concentrations of 25-hydroxyvitamin D3 (25(OH)D3) remained unaffected by 7-DHC. The relative mRNA data provided no plausible mechanism for the observed effects of 7-DHC on vitamin D3. All groups of mice had similar concentrations of cholesterol, desmosterol and 7-DHC in their serum and tissues. CONCLUSION: The current findings provide the first evidence that dietary 7-DHC seems to affect vitamin D metabolism. The underlying mechanism remains elusive and needs further investigation.
Assuntos
Colecalciferol/metabolismo , Desidrocolesteróis/farmacologia , Rim/metabolismo , Fígado/metabolismo , Provitaminas/farmacologia , Administração Oral , Ração Animal/análise , Animais , Calcifediol/análise , Calcifediol/sangue , Calcifediol/metabolismo , Colecalciferol/análise , Colecalciferol/sangue , Colesterol/análise , Colesterol/sangue , Colesterol/metabolismo , Desidrocolesteróis/administração & dosagem , Suplementos Nutricionais/análise , Masculino , Camundongos Endogâmicos C57BL , Provitaminas/administração & dosagem , Triglicerídeos/análise , Triglicerídeos/sangue , Triglicerídeos/metabolismoRESUMO
In adult rats exposed to hexavalent chromium (intraperitoneal injection of 0.028; 0.28 and 2.8 mg KCrO(kg bw/ day) during 48 days there is observed the decrease in the intensity of index of spermatogenesis, increase ofspermatids with micronuclei, intensifying of processes peroxidation of lipids in testis, resulted in the increase in the number of the abnormal spermatozoa and of percent of a fetal death. Simultaneous supplementation of ß-carotene in Cr (VI) exposed rats showed the increase of intensity index of spermatogenesis. Morphology of a sperm, intensity of processes peroxidation of lipids in testis and of number of viable embryos was restored.