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Chickpea Seeds Ferritin as a Potential Source in the Treatment of Iron Deficiency Anemia

Yun Huang*, Min Xin, Qian Li, Xiaohong Luo, Xiaowen Wang, Xianwei Zou, Xuan Liu, Benke Chen, Jintian Tang

Institute of Medical Physics and Engineering, Department of Engineering Physics, Tsinghua University, Beijing, China

Abstract: Iron deficiency anemia (IDA) is one of the most common nutritional problems that encountered all over the world. This study focused on the effects of chickpea seeds ferritin (CSF) as aniron supplement on IDA in rats. Six groups of female Wistar rats (n = 8) were used, which contain (1) control group; (2) IDA model group; (3) FeSO₄ positive control group (dosages of iron is 3 mg/(kg•d)); (4) CSF high-dose group (dosage of iron is 3 mg/(kg•d); (5) CSF medium-dose group (dosage of iron is 1.5 mg/(kg•d)); and (6) CSF low-dose group (dosage of iron is 0.75 mg/(kg•d)). After 2 weeks, the hemoglobin (Hb) concentration value, serum iron (SI) stores, body weights, blood parameters and tissue weights of anemic rats were measured, respectively. It showed that the Hb concentration value and SI stores were significantly increased in the iron supplement groups (CSF, FeSO₄) compared with the IDA model group (P< 0.05). Additionally, the changes of red blood cell (RBC) number and HCT (Hematocrit) level in CSF groups were significantly greater than the IDA model group at the end of the experiment. All in all, compared with FeSO₄ group, a higher bioavailability of iron and fewer side effects were observed in the CSF groups. Thus, the present study indicated that CSF was an effective source of iron supplement for the IDA model rats and could be developed as a functional product to overcome the malnutrition-related iron deficiency.

Keywords: iron deficiency anemia, chickpea seeds ferritin, hemoglobin, serum iron, iron supplement

Received July 14, 2014; Revised October 28, 2014; Accepted November 05, 2014

Citation: Yun Huang, Min Xin, Qian Li, Xiaohong Luo, Xiaowen Wang, Xianwei Zou, Xuan Liu, Benke Chen, Jintian Tang, Chickpea Seeds Ferritin as a Potential Source in the Treatment of Iron Deficiency Anemia. Journal of Food and Nutrition Research, 2 (12). 876-879. January 2014. doi:10.12691/jfnr-2-12-3

1. Introduction

Iron-deficiency anemia (IDA) is one of the most prevalent nutritional problem in the world [1], and caused primarily due to the low content of dietary iron and inadequate intake of bioavailableiron. Pregnant women and children are the most likely to suffer from IDA, especially in the developing country. In recent years, IDA have resulted in a wide series of adverse outcomes including mental retardation [2,3], poor pregnancy outcomes [4], decreased immune function [5], bad work performance [6] and so on. Therefore, a good source of this microelement with a better bioavailability profile is required, and how to promote iron absorption seems to be a practical and effective means of combating and preventing iron deficiency anemia.

Currently, the treatment of IDA mainly constitutes supplementation with luminal iron present as Fe³⁺ and Fe²⁺ or dietary diversification. However, it is a pity that both forms of ions can form complexes with phytate, tannin, etc., preventing uptake into mucosal cells [7,8,9,10]; Moreover, it also can cause many side effects such as heartburn, abdominal pain, nausea, and diarrhea, all of which limit the general applicability of this kind of clinical application. Thus, food fortification seems to be the ideal strategy for prevention of this nutritional disorder in the world [11]. One of the methods being considered for fortification of the human diet with iron is food enrichment in plant ferritin, whose side effects and toxicity are relatively minimal [12]. Chickpea seeds ferritin appropriately provides an effective means of controlling the iron deficiency due to a high iron content with better absorption, so it is supposed to be explored a safe and efficient functional source for iron supplement.

Up to date, only few works have been done to deal with the existing association between iron deficiency and chickpea seeds ferritin, this work aimed to evaluate the effect of iron supplementation resulting from chickpea in rats with IDA. Crude phytoferritin was extracted from chickpea seeds, and particular emphasis of this study is placed on an attempt to lessen adverse effects, thereby providing an alternate iron supplement approach.

2. Materials and Methods

2.1. Reagents and Materials Used

Sodium hydrosulfite (West Long Chemical Co., Ltd, China); 1,10-Phenanthroline monohydrate (Tianjin Fucheng Chemical Reagent factory, China); Van Kampen Zijlstra (Rongbo Biological Technology Co., Ltd, China); FeSO4 (Sigma Company, American); EDTA-Na2 (Beijing Hundred LingKe Biological Technology Co., Ltd, China); Iron deficiency fodder (purchased from Keaoxieli fodder Co., Ltd, China)containing 5 mg iron kg⁻¹ diet. All other reagents used were of analytical grade or purer.

2.2. Preparation of the Chickpea Seeds Ferritin (CSF)

Dried chickpea seeds were obtained from the local market, and ferritin isolates were prepared and purified as following described method [13]: chickpea seeds soaked in deionized water at 4°C chromatography cabinet for about 15 h. After filtration, the test samples were immersed with KH₂PO₄-NaOH buffer (pH=8.0) at the ratio of 1:4 (g/ mL) for 2 hours, crude ferritin isolation via the salting out method with 70 mmol/L MgCl₂ was then obtained by using water washing twice after high-speed centrifugation. Resulting samples were finally lyophilized, powdered, and frozen at −80°C until used.

2.3. Experimental Animals

The experiment performed for analysis of the availability of ferritin was conducted on groups of rats either with induced iron-deficiency anemia or non iron-deficient. In the present study, forty-eight healthy female Wistarrats with a balanced initial body weight of 80±5 g were provided by animals laboratory of Tsinghua University. The rats were measured at appropriate conditions (a temperature of 25±1°C, relative air humidity at the level of 55±5%, and optimum daily lighting cycle, i.e. 12 h of light/12 h of darkness), and distilled deionized water was given continuously. All experimental procedures involving animals received the approval from the Animal Care and Use Committee of Tsinghua University.

After adaptation for 3 days, the rats were randomly divided into the control group and the IDA model groups. Eight rats were selected randomly and given normal diets as the control group. The remaining was given low iron diets for 4 weeks to generate an IDA animal model. The whole experimental process was strictly controlled to avoid iron stain. Hb levels were tested weekly, and IDA was defined as Hb values lower than 90 g/L.

Forty IDA rats were randomly assigned into 5 groups of eight animals, each with equal mean Hb values: the IDA model group; the positive group (FeSO₄, dosage of ironis 3 mg/(kg·d)); the high-dose group(CSF, dosage of ironis 3 mg/(kg·d)); the medium-dose group(CSF, dosage of ironis 1.5 mg/(kg·d)); the low-dose group(CSF, dosage of ironis 0.75 mg/(kg·d)). Rats in the positive group were administered FeSO₄ solution, rats in the CSF groups were administered the CSF suspension, while rats in the control and model group were administered distilled deionized water. All supplements were freshly prepared every day and intragastric administration was performed once at 10:00 AM each day for 2 weeks.

2.4. Tissue and Blood Collection

After overnight food deprivation, rats were first anesthetized with barbital sodium and blood samples were collected from the abdominal aorta into anticoagulant blood vessels for immediate Hb analysis and into centrifuge tubes for separation of the serum for future analyses. The rats were killed by decapitation, and the organs such as heart, liver, spleen and kidneys were removed, weighed and rapidly frozen in liquid nitrogen at-80°C for upcoming applications. The serum was separated by centrifugation at 3000 g for 5 min and stored at-20°C for the following research.

2.5. Statistical Analysis

Statistical analyses were performed by SPSS 17.0 software for Windows (SPSS Inc., Chicago, IL, USA). The differences between the groups among treatments in each group were determined by one-way analysis of variances ANOVA. Comparisons of the means with P<0.05 were considered significantly different. Duncan's multiple-range tests were performed, and data were presented as means with their standard deviations.

3. Results

3.1. Hb concentration, RBC Numbers and HCT Levels of Rats

Table 1. The Hb concentration, RBC number and HCT level of rats in each group(X±s, n=8)

The Hbconcentration, RBC numbers and HCT level in the experiment groups and the control group were not significantly different at the beginning of the experiment (P> 0.05) (Table 1). However, the Hb, RBC and HCT levels in the iron-deficient diet groups were markedly lower than the control group after 4 weeks depletion (P< 0.05), suggesting that the proposed scheme was of great success. When the IDA rats were fed with iron supplements (FeSO4 and CSF) for 2 weeks, the Hbconcentrations were gradually recovered to the same level as the control group, and much higher than those of the model. These results suggested that CSF has the same therapy effects in supplementing iron as the FeSO₄. In addition, RBC and HCT parameters displayed that the CSF high-dose group can even approached the higher level than the control group at the 6th weeks, while the FeSO₄ group showed the nearly the same as the model.

3.2. Serum Iron of Rats

The recovery from IDA was also determined by measuring the concentration of serum iron (Table 2). The results showed that at the 4th week, the concentration of test groups have significantly differences from that of the control group (P<0.05, Table 3). At the end of the experiment, the iron concentrations of the serum in the different dosages of CSF groups and the FeSO₄ group were almost 1.3 fold higher than those of model group (2.3±1.9 mg/L), which was found to be statistically significant (P< 0.05), and slightly above the control group. This result indicated that the samples were effective in the iron recovery.

Table 2. The serum iron concentration of rats in each group (X±s, n=8)

3.3. Tissue Weight of Rats

Table 3. The organ indices of rats ineach group(X±s, n=8)

Table 3 shows the relative tissue (heart, liver, spleen and kidney) weights in each group. The relative weights of the liver in the different dose groups have markedly improved compared with the model group. A similar result was observed in rats kidney treated with medium and high-dose CSF. However, no statistical differences were observed in their heart and spleen indices. These results further demonstrated that liver and kidney are the main storage site for iron, and both FeSO₄ and CSF were effective iron supplements for IDA rats.

3.4. Body Weight Gain of Rats

The body weight changes of the rats are shown in Table 4. Initially, the mean body weight of the rats in the experiment groups and the control group did not differ (P> 0.05). After 4 weeks of low iron dietary treatment, the mean body weight in the model group was significantly lower than the control group (P< 0.05). When 5th and 6th weeks repletion, the mean body weight of the CSF and FeSO₄ groups still lower than the control group (P< 0.05). The result also suggested that the medication in each treatment groups had weak effects on the growth of rats during only 2 weeks of repletion.

Table 4. The body weight changes of rats in each group(X±s, n=8)

4. Discussion

Chickpea ranks third (FAO 2008) among food legumes for world production, one of important characteristics providing nutrition for human health as iron-containing complementary foods. The major objective of this study was to evaluate the effects of on IDA rats. Meanwhile, its effects of iron supplements on Wistarrat were also studied for the first time. It was worth noting that CSF can be used as an effective iron supplement as we expected.

Iron is necessary for hemoglobin synthesis, it is logical to assume that any iron inadequacy would be reflected in a slower hemoglobin synthetic rate [14]. Concentration of Hb, is a key indicator to decide whether anemia has existed and measure iron Status [15]. In the present study, the Hbcontraction was investigated before and after the model built successfully. Fortunately, significant changes were detected in IDA rats when fed iron supplement, the levels of Hb in the CSF and FeSO₄ groups were returned to the same level as those of the control group, meaning that CSF can be a potential iron supplements. A marked increase in hemoglobin observed in the rats fed the iron supplement diet can be explained by repletion of hemoglobin iron. Moreover, the parameters associated with blood counts, i.e. RBC and HCT were measured and showed that high-dose CSF group can achieve the higher levels than the control, which might also be explained by the increase in the content of iron in the diet with the CSF isolate.

Serum iron is a medical laboratory test that measures how much circulating iron that is bound to transferrin. In this study, the IDA rats had lower serum iron than the control group, while the IDA rats supplemented with CSF and FeSO₄ showed increased serum iron in almost parallel level, which is in line with as previous report [14], implying that CSF is a potential preferred iron supplement, and the affinity of transferrin for iron derived from ferritin is comparatively high.

The effects of iron from CSF and FeSO₄ were also determined by measuring the ratio of tissue weights to body weight (g/kg) of the experimental rats (Table 3). In this study, the response was directly related to the high amount of iron that could be delivered directly to these tissues. Rats with IDA have more requirements of iron in the liver and kidney, rather than heart and spleen. To some extent, it is than suggested than liver and kidney are the major storage sites for iron. In addition, it is also required to replenish iron during the period of IDA, as long-term of iron defiance will have negative impacts on the important function of viscera, especially immune function and anti-infection ability.

At the early stage of experiment, there were no noticeable differences in body weight gains between these dietary groups. Body weight gains pronouncedly decreased in iron-deficient groups after depletion, suggesting that iron is accepted as an important indicator for promoting rats’ growth in comparison with the previous reportes [16,17,18]. Accordingly, rats in the iron-repletion groups such as CSF and FeSO₄ groups did not show body weight growth and were far lower than the control group. At the same time, different doses of CSF did not provide any obvious clues that can fully explain the drug independence, probably due to the short duration of the experiment groups.

5. Conclusion

In summary, the improving effect of CSF on iron deficiency anemia was investigated in female Wistarrats induced by oral administration of iron-deficient diet. The factors, such as weights, hematological, serum iron, blood parameters, tissue Weight of anemic rats fed with CSF were explored. It demonstrated that CSF may possess a great potential to be used as iron supplement because it is effective in the promotion of iron absorption. Further study is also required to investigate the mechanism for the positive effects of CSF on the bioavailability of iron.

Acknowledgments

This research was financially supported by National Natural Science Foundation of China (Grant Nos. 81102889). The authors are grateful to all of the people who offered help in this study.

List of Abbreviations

CSF: Chickpea Seeds Ferritin

Hb: Hemoglobin

HCT: Hematocrit

IDA: Iron Deficiency Anemia

SI: Serum Iron

RBC: Red Blood Cell

References

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