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Query: UMLS:C0240066 (iron deficiency)
 7,156 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Phytate, a salt of phytic acid (myo-inositol 1,2,3,4,5,6-hexakisphosphate), is found in certain plant-based foods. It strongly chelates minerals, forming insoluble complexes in the small intestine that cannot be digested or absorbed. Information on the phytate content of rice-based diets of children in Northeast Thailand is limited. In this study 1-day weighed duplicate diet composites were collected from 40 Northeast Thai children (age 6-13 years) randomly selected from participants (n=567) of an efficacy trial in Ubon Ratchathani province. Diet composites were analyzed for zinc, iron, and calcium by atomic absorption spectrophotometry, and for phytate (as inositol penta-phosphate and hexa-phosphate) by high-performance liquid chromatography; the accuracy and precision were established using a certified reference material for the minerals and an inter-laboratory comparison for phytate. The median (1st, 3rd quartiles) zinc, iron, and calcium contents of the diet composites were 4.3 (3.7, 6.1), 4.3 (3.2, 6.5) and 130 (82, 216) mg/day, respectively. The inositol penta-phosphate and hexa-phosphate levels were so low they were below the detection limit, attributed in part to leaching of water-soluble potassium and magnesium phytate from glutinous rice after soaking overnight before cooking. Clearly, phytate will not compromise mineral absorption from these diets. Instead, low zinc intakes are probably primarily responsible for the low zinc status of these children. In contrast, although intakes of dietary iron appear low, the prevalence of biochemical iron deficiency was also low, suggesting that iron absorption may have been higher than previously assumed. Whether the low calcium intakes compromise optimal bone health in these growing Northeast Thai school children is unknown.
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PMID:Low zinc, iron, and calcium intakes of Northeast Thai school children consuming glutinous rice-based diets are not exacerbated by high phytate. 1716 30

Iron chlorosis is very common on alkaline soils such as calcareous ones, since iron availability is limited by high pH. Under these conditions of iron deficiency, graminaceous plant species induce special mechanisms for iron acquisition, involving enhanced release of iron chelators called phytosiderophores. On the other hand, it is known that most of salt soils have alkaline pH. So, plants growing on this kind of soils are often subjected simultaneously to salinity and iron deficiency. This work aimed at (i) studying the physiological responses of barley (Hordeum vulgare L.) to iron deficiency, and (ii) evaluating the effect of salt on the iron nutrition and the phytosiderophore release. For this purpose, seedlings of Hordeum vulgare L. were cultivated under controlled conditions, either in a complete nutrient solution with or without NaCl, or in an iron free nutrient solution containing or not NaCl. The plant morphological aspect, chlorophyll content of young leaves, iron status, biomass production, and phytosiderophore release by roots were assessed. Plants subjected to Fe deficiency exhibited a severe chlorosis, accompanied by a significant biomass reduction. These plants developed more lateral roots than the control with a highly stimulated phytosiderophore release. However, the latter was greatly diminished when iron deficiency was associated to salinity. A depressive effect of salt on iron acquisition in plants subjected only to salt stress which was also observed and further confirmed by the important decrease of efficiency in iron acquisition. These results suggest that salinity may reduce capacity of plants to acquire iron from alkaline soils by inhibiting phytosiderophore release.
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PMID:Effect of salt on physiological responses of barley to iron deficiency. 1746 85

In calcareous salt-affected soils, iron availability to plants is subjected to the effects of both sodium and bicarbonate ions. Our aim was to study interactive effects of salinity and iron deficiency on iron acquisition and root acidification induced by iron deficiency in Medicago ciliaris L., a species commonly found in saline ecosystems. Four treatments were used: C, control treatment, complete medium (CM) containing 30 microM Fe; S, salt treatment, CM with 75 mM NaCl; D, deficient treatment, CM containing only 1 microM Fe; DS, interactive treatment, CM containing 1 microM Fe with 75 mM NaCl. Our study showed that plant growth and chlorophyll content were much more affected by the interactive treatment than by iron deficiency or by the salt treatment, indicating an additive effect of these constraints in DS plants. These results could be partially explained by Na accumulation in shoots as well as a limitation of nutrient uptake such as Fe and K under salt stress, under iron deficiency, and especially under their combined effect. The study also showed that root acidification was deeply diminished when iron deficiency was associated with salinity. This probably explained the decrease of Fe uptake and suggested that root proton pump activity would be inhibited by salinity.
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PMID:Interactive effects of salinity and iron deficiency in Medicago ciliaris. 1792 71

Root hair development is controlled by environmental signals. Studies on root hair plasticity in Arabidopsis thaliana have mainly focused on phosphate and iron deficiency. Root hair growth and development and their physiological role in response to salt stress are largely unknown. Here, we show that root epidermal cell types and root hair development are highly regulated by salt stress. Root hair length and density decreased significantly in a dose-dependent manner on both primary roots and junction sites between roots and shoots. The root hair growth and development were sensitive to inhibition by ions but not to osmotic stress. High salinity also alters anatomical structure of roots, leading to a decrease in cell number in N positions and enlargement of the cells. Moreover, analysis of the salt overly sensitive mutants indicated that salt-induced root hair response is caused by ion disequilibrium and appears to be an adaptive mechanism that reduces excessive ion uptake. Finally, we show that genes WER, GL3, EGL3, CPC, and GL2 might be involved in cell specification of root epidermis in stressed plants. Taken together, data suggests that salt-induced root hair plasticity represents a coordinated strategy for early stress avoidance and tolerance as well as a morphological sign of stress adaptation.
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PMID:Salt-induced plasticity of root hair development is caused by ion disequilibrium in Arabidopsis thaliana. 1806 Mar 49

Micronutrient deficiencies and anaemia remain as major health concerns for children in Bangladesh. Among the micronutrient interventions, supplementation with vitamin A to children aged less than five years has been the most successful, especially after distribution of vitamin A was combined with National Immunization Days. Although salt sold in Bangladesh is intended to contain iodine, much of the salt does not contain iodine, and iodine deficiency continues to be common. Anaemia similarly is common among all population groups and has shown no sign of improvement even when iron-supplementation programmes have been attempted. It appears that many other causes contribute to anaemia in addition to iron deficiency. Zinc deficiency is a key micronutrient deficiency and is covered in a separate paper because of its importance among new child-health interventions.
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PMID:Micronutrients and anaemia. 1883 Dec 29

The management of anemia in uremic patients undergoing hemodialysis requires the appropriate combination of erythropoietin treatment, iron supplementation, and on occasion androgen therapy. Identifying and correcting functional iron deficiency is crucial to optimizing erythropoietin efficiency. Recently, however, the trend to administer maintenance iron with resultant high serum ferritin and high transferrin saturation has led to an increase in reports of iron overload. Oral iron supplementation is inexpensive and safe, but poor patient compliance and reduced intestinal absorption may limit its efficacy. Intravenous iron, on the other hand, is effective, and its safety is related to the iron salt used. Currently available data suggest that iron saccharate may be the safest iron salt available for intravenous administration, although iron gluconate is safer than the dextran forms of intravenous iron. It should be kept in mind, however, that all forms of intravenous iron may have the potential of inducing iron overload. At this time, the levels of ferritin that define iron overload are not clearly established. The side effects of iron overload are well recognized (infections, malignancies, vascular diseases); however, no guidelines exist for safe practice. There are many markers of iron deficiency, with serum ferritin and hypochromic red cell percentage currently the best markers available in clinical practice.
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PMID:Iron management in hemodialysis patients: optimizing outcomes in Vicenza, Italy. 1937 68

The futC gene encodes a subunit of an ATP-binding cassette (ABC)-type iron transporter in Synechocystis sp. strain PCC 6803. In the present study, we have focused on the environmental regulation of futC transcription in the model organism Synechocystis sp. strain PCC 6803 and, moreover, studied the transcriptional regulation of the other transporter subunits, futA1, futA2 and futB. The steady-state amounts of the futA1, futA2, futB and futC transcripts were regulated under several conditions studied including darkness, temperature, alternative nitrogen source, salt and osmotic stresses and iron deficiency. Transcription of all subunits of the FutABC-iron transporter seems to be under similar regulation, which, according to our results, may also apply to genes encoding subunits of other transporters in Synechocystis. The sequence alignment, including sequences from six different organisms, revealed the conserved nature of FutC. Based on the sequence alignment and the structural model of FutC, the monomer consists of a nucleotide-binding domain (NBD) and a regulatory domain. The NBD is well conserved indicating completely functional ATP binding.
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PMID:Transcriptional regulation and structural modeling of the FutC subunit of an ABC-type iron transporter in Synechocystis sp. strain PCC 6803. 1943 Jul 63

Micronutrients, mostly iodine and selenium, are required for thyroid hormone synthesis and function. Iodine is an essential component of thyroid hormones and its deficiency is considered as the most common cause of preventable brain damage in the world. Nowadays about 800 million people are affected by iodine deficiency disorders that include goiter, hypothyroidism, mental retardation, and a wide spectrum of other growth and developmental abnormalities. Iodine supplementation, under form of iodized salt and iodized vegetable oil, produced dramatic improvements in many areas, even though iodine deficiency is still a problem not only for developing countries. In fact, certain subpopulations like vegetarians may not reach an adequate iodine intake even in countries considered iodine-sufficient. A reduction in dietary iodine content could also be related to increased adherence to dietary recommendations to reduce salt intake for preventing hypertension. Furthermore, iodine intakes are declining in many countries where, after endemic goiter eradication, the lack of monitoring of iodine nutrition can lead to a reappearance of goiter and other iodine deficiency disorders. Three different selenium-dependent iodothyronine deiodinases (types I, II, and III) can both activate and inactivate thyroid hormones, making selenium an essential micronutrient for normal development, growth, and metabolism. Furthermore, selenium is found as selenocysteine in the catalytic center of enzymes protecting the thyroid from free radicals damage. In this way, selenium deficiency can exacerbate the effects of iodine deficiency and the same is true for vitamin A or iron deficiency. Substances introduced with food, such as thiocyanate and isoflavones or certain herbal preparations, can interfere with micronutrients and influence thyroid function. Aim of this paper is to review the role of micronutrients in thyroid function and diseases.
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PMID:Role of iodine, selenium and other micronutrients in thyroid function and disorders. 1959 17

In India < 90% of anaemia cases are estimated to be due to iron deficiency, because high iron requirements during pregnancy are not easily fulfilled by dietary intake. Ferrous ascorbate is widely prescribed iron salt in India but still no trial of ferrous ascorbate in Indian patients has been published. The study is to aim the evaluation of efficacy and tolerability of RB Tone forte tablet in the treatment of pregnancy anaemia. Fifty-five pregnant women (> 18 years) with haemoglobin value between 8 and 11 g/dl in 13th week of pregnancy were included in the study. The duration of study was 6 months. Study drug RB Tone forte tablet, (Medley pharmaceutical, Mumbai) containing ferrous ascorbate equivalent to elemental iron 100 mg + folic acid 1.5 mg + elemental zinc 22.5 mg was prescribed once daily to all pregnant women from 13th week of pregnancy for a duration of 6 months. Haemoglobin was assessed at the beginning of the therapy and at the end of the trial. Study included birth weight and gestational age as outcomes because of a need for more information on the functional consequences of iron supplementation during pregnancy. Tolerability was evaluated based on the global assessment by the investigator and patients on a 3-point scale marked as excellent/good/poor. Fifty patients were included for final analysis, 5 patients lost to follow-up. Haemoglobin levels increased from the mean baseline value of 8.950 +/- 0.1422 g/dl to 11.91 +/- 0.07840 g/dl, with mean increase of 2.964 +/- 0.1624 g/dl at the end of trial (p < 0.0001). Mean birth weight of infants (n = 50) was found to be 3079 +/- 25.10 g. Mean gestational age at the time of delivery was 38 weeks. No preterm delivery was reported, As per investigators assessment about tolerability of trial drug, 48% of patients reported good, 46% excellent and 6% reported poor tolerability. As per patient's assessment about tolerability 92% of patients reported good to excellent tolerability and 8% reported poor tolerability. All patients reported excellent gastro-intestinal tolerability of study drug. Positive effect on pregnancy outcome like gestational age and birth weight is mainly attributed to vasodilating property of ferrous ascorbate and beneficial effect of zinc. Ferrous ascorbate must be preferred as first choice of oral iron salt due to positive effect on haemoglobin value, vasodilating property and superior tolerability.
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PMID:Evaluation of efficacy and tolerability of RB Tone forte tablet in the treatment of pregnancy anaemia. 2188 80

Iron-deficiency anaemia, the condition in which anaemia occurs due to a lack of iron, develops when the amount of available iron is insufficient to support normal red blood cell production. Iron deficiency and iron-deficiency anaemia, very prevalent conditions in premenopausal women, are often associated with menometrorrhagia (present in more than two-thirds of cases of iron-deficiency anaemia in premenopausal women). Appropriate identification and treatment of iron deficiency is imperative as iron deficiency can induce important specific clinical manifestations (including fatigue, atrophic changes in the epithelium, oral lesions, dysphagia, nail lesions, reduced immune response). Iron supplementation is the most common strategy used to control iron deficiency. Based on World Health Organisation recommendations, the most appropriate treatment is with an oral ferrous salt in a prolonged-release tablet form, to provide a dose of elemental iron equivalent to 60 mg per intake, in the range of 60 and 120 mg/day according to the severity of iron-deficiency anaemia. When haemoglobin levels have returned to normal, treatment should continue for about 3 months to fill iron stores. An extended-release formulation of ferrous sulphate with mucoproteose has been shown to be associated with a lower incidence of gastrointestinal adverse effects compared with other ferrous and ferric salts.
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PMID:The management of iron deficiency in menometrorrhagia. 2218 56


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