|Year : 2018 | Volume
| Issue : 3 | Page : 102-106
Effects of Colocasia esculenta leaf extract in anemic and normal wistar rats
Silas Anayo Ufelle1, Kenechukwu Chibuike Onyekwelu2, Samuel Ghasi3, Charles Ogbonna Ezeh2, Richard Chukwunonye Ezeh4, Emmanuel Anayochukwu Esom5
1 Department of Medical Laboratory Sciences, College of Medicine, University of Nigeria Enugu Campus, Enugu, Nigeria
2 Department of Medical Biochemistry, College of Medicine, University of Nigeria Enugu Campus, Enugu, Nigeria
3 Department of Pharmacology and Therapeutics, College of Medicine, University of Nigeria Enugu Campus, Enugu, Nigeria
4 Department of Medical Biochemistry, ESUT College of Medicine, Enugu, Nigeria
5 Department of Human Anatomy, College of Medicine, University of Nigeria Enugu Campus, Enugu, Nigeria
|Date of Submission||17-Jul-2017|
|Date of Decision||20-Nov-2017|
|Date of Acceptance||02-Jan-2018|
|Date of Web Publication||1-Jun-2018|
Dr. Kenechukwu Chibuike Onyekwelu
Department of Medical Biochemistry, College of Medicine, University of Nigeria Enugu Campus, Enugu
Source of Support: None, Conflict of Interest: None
Background and Objective: Colocasia esculenta is a tropical plant primarily grown for its edible starchy corm. It is a food staple in African, Oceanic, and South Indian cultures and is believed to have been one of the earliest cultivated plants. This study was aimed at investigating the hematological effects of C. esculenta leaf extract in anemic and normal Wistar rats. Materials and Methods: Wistar rats (n = 30), aged 2–3 months, weighing 160–220 g, were categorized into five groups (A to E). Groups A and B were orally induced with 1.35 mg/kg bodyweight of methotrexate for anemia. Graded doses of the extract were administered to Groups A to D (A = 300, B = 600, C = 300, and D = 600 mg/kg bodyweight) for 14 days. Group E served as control. Blood samples (3.0 ml) were collected on days 8 and 15 into tri-potassium ethylenediaminetetraacetic acid containers and analyzed using an hematological autoanalyzer (Sysmex KX-21N) following manufacturer's guidelines. Results: The acute toxicity test revealed an oral LD50of 6000 mg/kg bodyweight. On day 8, Groups A and B revealed significant decrease (P < 0.005) in hemoglobin (Hb), hematocrit (Hct), and red blood cell (RBC) count compared to that of control. On day 15, Group B revealed significant increase (P < 0.005) in total white blood cell (TWBC) count; Groups C and D revealed significant increase (P < 0.005) in Hb, Hct, RBC, and TWBC compared to that of control. Conclusions: This study revealed dose- and time-dependent increase in Hb, Hct, and RBC in normal Wistar rats and leukocytosis in both normal and anemic Wistar rats by crude methanolic extract of C. esculenta leaves. These indicate hematopoiesis in normal Wistar rats.
Keywords: Colocasia esculenta, anemia, hematopoiesis
|How to cite this article:|
Ufelle SA, Onyekwelu KC, Ghasi S, Ezeh CO, Ezeh RC, Esom EA. Effects of Colocasia esculenta leaf extract in anemic and normal wistar rats. J Med Sci 2018;38:102-6
|How to cite this URL:|
Ufelle SA, Onyekwelu KC, Ghasi S, Ezeh CO, Ezeh RC, Esom EA. Effects of Colocasia esculenta leaf extract in anemic and normal wistar rats. J Med Sci [serial online] 2018 [cited 2018 Aug 18];38:102-6. Available from: http://www.jmedscindmc.com/text.asp?2018/38/3/102/229493
| Introduction|| |
Anemia is decreased oxygen-binding ability of each hemoglobin (Hb) molecule due to deformity or lack in numerical development as in some other types of Hb molecule. It is also a reduction of Hb and hematocrit (Hct) levels in relation to age, sex, and location of the individual considered. The bone marrow is the major site of hemopoiesis in adult humans. Hematinic drugs stimulate the erythropoietin to produce more blood cells during anemia and this has been demonstrated in medicinal plants. Herbal drugs or medicinal plants have developed a wide spectrum of biological activities.
Colocasia esculenta is also known as cocoyam. It is grown for its edible corms, cormels, leaves, and for other traditional uses by subsistence farmers. It is generally cultivated for enlarged underground starch-rich corms and cormels called tubers. The main problem in the consumption of the leaves of C. esculenta is the presence of antinutritional factors. These factors may have adverse effect on health through inhibition of protein digestion, growth, and iron and zinc absorption. However, all parts of the raw C. esculenta plant are known to contain oxalate, a toxic compound, which must be destroyed by thorough cooking before eating.
The leaves of C. esculenta have been reported to have nutrients, including minerals and vitamins such as calcium, phosphorus, iron, Vitamin C, thiamine, riboflavin, and niacin. The leaves contain mucilage and are an effective nervine tonic. The leaf juice is a stimulant, expectorant, astringent, and appetizer. It is used as a folk medicine to cure diarrhea. C. esculenta possess hypoglycemic effect due to the presence of cyanoglycoside. Its hypolipidemic activity has been reported due to the presence of arabinogalactan and mono and digalactocyl diacylglycerols.
Despite the numerous medicinal properties and uses of this extract, there is paucity of information on its biochemical and hematological effects in anemic and normal Wistar rats. This study will advance knowledge on the possible hematopoietic and leukocytotic effects of C. esculenta leaf extract. The aim of this study was to investigate the biochemical and hematological effects of C. esculenta leaf extract in anemic and normal Wistar rats. The specific objectives were to determine (i) the acute toxicity (LD50) of the extract and (ii) the biochemical and hematological parameters of anemic and normal Wistar rats after oral administration of graded doses of the extract.
| Materials and Methods|| |
Collection and authentication of plant materials
The leaves of C. esculenta were obtained from Ajalli town, Orumba North Local Government Area in Anambra State, Nigeria, in August 2016, and authenticated by a taxonomist in the Department of Plant Science and Biotechnology, University of Nigeria, Nsukka, Nigeria. A specimen was deposited in the herbarium for future reference with a voucher number of UNH 379a.
Wistar rats (n = 30) were purchased and housed in the animal house of College of Medicine, University of Nigeria Enugu campus, Nigeria. They were allowed to acclimatize for 2 weeks and fed with commercially available rat feed and had access to water and feed ad libitum. All the Wistar rats in the study were handled according to the international guidelines for handling experimental animals by the American Physiological Society.
Preparation of the extract
The leaves of C. esculenta were shade-dried and grinded into fine powder. Two hundred and seventy grams of the powder was soaked in 2.5 L of methanol (CH3 OH) for 48 h. It was sieved with a muslin cloth and filtered with Whatman No. 1 filter paper. The filtrate was evaporated to dryness. The dried extract yield was scrapped out of the stainless bowl and 10 g of it was dissolved in 100 ml of distilled water to get a concentration of 100 mg/ml for use.
Wistar rats (n = 30) weighing 160–220 g and aged 2–3 months were divided into five groups of six rats per group and labeled from A to E. Groups A and B were orally induced for anemia with 1.35 mg/kg bodyweight of methotrexate. After 3 days of anemic induction, Groups A, B, C, and D were orally administered with graded doses of the extract (A = 300, B = 600, C = 300, and D = 600 mg/kg bodyweight) based on the Organization of Economic Cooperation and Development's guidelines on drug dosage  for 14 days. Group E served as control. Blood samples (3 ml) were collected from all the rats on days 8 and 15 through the retro-orbital plexus of the median canthus into ethylenediaminetetraacetic acid anticoagulant containers.
Acute toxicity test (median lethal dose, LD50)
This was performed on rats according to the procedure described by Lorke, 1983, with little modification. The LD50 was performed in two stages. In the first stage, three groups of three rats each were treated with 10, 100, and 1000 mg/kg of the extract and observed for the number of deaths in 24 h. Based on the percentage survival rate, four mice were treated with 1500, 3000, 6000, and 12,000 mg/kg bodyweight of extract in the second stage and the number of deaths in 24 h was recorded. The LD50 was calculated as the geometric mean of the highest nonlethal and the lowest lethal doses.
Hb, Hct, red blood cell (RBC), mean cell Hb concentration, mean cell Hb, mean cell volume, total white blood cell (TWBC), neutrophil, lymphocyte, monocyte, and eosinophil were analyzed using an hematological autoanalyzer (Sysmex KX-21N) following manufacturer's guideline.
The procedures followed in this study were in accordance with the ethical standards of ethics committee on animal experimentation.
The data were subjected to descriptive statistics and analyzed using Student's t-test and one-way ANOVA. P < 0.05 was considered statistically significant.
| Results|| |
The acute toxicity test revealed an oral LD50 of 6000 mg/kg bodyweight. On day 8, Groups A and B (anemic-induced Wistar rats) revealed significant decrease (P< 0.05) in Hb, Hct, and RBC count when compared with the control [Table 1]. Groups C and D (normal Wistar rats) revealed a significant increase (P< 0.05) in TWBC count when compared with the control [Table 1]. On day 15, Groups B, C, and D revealed significant increase (P< 0.05) in TWBC count; Groups C and D revealed significant increase (P< 0.05) in Hb, Hct, and RBC count compared to control [Table 2]. These findings show the possible hematopoietic and leukocytotic effects of C. esculenta leaf extract on anemic-induced and normal Wistar rats.
|Table 1: The mean±standard deviation of hematological parameters of anemic, normal, and control Wistar rats on day 8 after oral administration of graded doses of crude methanol extract of Colocasia esculenta leaves|
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|Table 2: Mean±standard deviation of hematological parameters of anemic, normal, and control Wistar rats on day 15 after oral administration of crude extract of Colocasia esculenta|
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| Discussion|| |
C. esculenta possess anticancer, anti-inflammatory, anti-oxidant, antimicrobial, hypoglycemic, and anthelmintic activities. It also has some neuropharmacological activities such as anti-depressant, sedative, and smooth muscle relaxant activities. The phytochemical constituents of C. esculenta leaf extract include alkanoids, flavonoids, saponins, tannins, calcium, oxalate, fibers, minerals (calcium and phosphorus), and starch. The leaves of C. esculenta have been reported to be rich in nutrients, including minerals and vitamins such as calcium, phosphorus, iron, Vitamin C, thiamine, riboflavin, and niacin., However, all parts of the raw C. esculenta plant are known to contain oxalate, a toxic compound, which must be destroyed by thorough cooking before eating.
In this study, the observed high LD50 of 6000 mg/kg bodyweight in the C. esculenta leaves extract indicates that the extract may probably be nontoxic and will be safe for consumption. On the contrary, Kalariya et al., in their work entitled “Effect of hydroalcoholic extract of leaves of Colocasia esculenta on marble-burying behavior in mice: Implications for obsessive-compulsive disorder,” recorded an intraperitoneal LD50 value of 1000 mg/kg.
The observed decrease in Hb, Hct, and RBC count on day 8 in the anemic groups [Table 1] could be due to the effects of methotrexate which was used to induce anemia. The anemia which was induced by the methotrexate was not addressed by the extract at this stage of extract administration probably due to short duration which may not be enough to reveal significant effects. The observed leukocytosis in the normal groups on day 8 indicates that the extract may have stimulatory effect on the immune system that resulted in the production of more leukocytes. However, on day 15, the observed increase in Hb, Hct, and RBC count in the normal groups and leukocytosis in the higher extract dose anemic group and the normal groups [Table 2] indicate hematopoietic potentials of the extract. The extract may have stimulated the kidney to synthesize erythropoietin for hematopoiesis to occur., The observed effects were dose- and time-dependent since it was noticed at higher dose of the extract and at longer duration of administration. The effects may also be attributed to the diminishing effects of methotrexate at longer duration of extract administration. The observed leukocytosis indicates immune stimulatory potential of the extract. The antinutritional factors present in the extract may also contribute to the observed effects. This also shows that the extract is antigenic by stimulating the defense mechanism for the production of more leukocytes as antibodies to guard against foreign bodies like the antinutritional factor content of the extract. These effects may equally be attributed to some of the phytochemical constituents of the extract such as flavonoid which is a strong antioxidant, protein, saponin, and vitamin. Some of these phytochemicals may support cell growth and suppress apoptosis.
| Conclusions|| |
This study revealed dose- and time-dependent increase in Hb, Hct, RBC, and leukocytosis in normal Wistar rats and leukocytosis in anemic Wistar rats (higher extract dose). The findings suggested that this extract may possess hematopoietic and leukocytotic potentials.
Further study is recommended to fractionate C. esculenta leaf extract using column chromatography and gas chromatography-mass spectrometry to pinpoint the actual components of the extract responsible for the observed effects.
Financial support and sponsorship
Conflicts of interest
There are no conflicts of interest.
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[Table 1], [Table 2]