ACUTE TOXICITY OF HYDROXYUREA IN MALE ALBINO MICEHTML Full Text
ACUTE TOXICITY OF HYDROXYUREA IN MALE ALBINO MICE
Ali I. Al-ameedi * 1, Muhammed M. Al-Ani 2 and Bashar S. Sahib 3
Department of Physiology Pharmacology 1, Collage of Veterinary Medicine Al-Qasim Green University, Iraq.
Department of Pharmacology 2, Collage of Pharmacy, University of Anbar, Iraq.
Department of Basic Science 3, College of Nursing Al-Qadisiyah University, Iraq.
ABSTRACT: This study was carried out to investigate the acute oral toxicity LD50 of an anti-neoplastic and a chemotherapeutic agent hydroxyurea in male albino mice by using up α Down method. The result revealed that LD50 of hydroxyurea was (7868.5 mg/kg. b.w). Orally after 24 h of exposure. That’s mean it is slightly toxic agent. To study the effect of lethal doses of hydroxyurea on the some of blood parameters, two survival animals were taken from this study which was received (7000 mg/kg. b.w and 7500 mg/kg. b.w ) orally and compared with normal values of blood parameters in male albino mice. The results revealed there is an increase in Hb comparing with the normal values and the increase was dose dependent manner, while the results showed decrease of RBCs, WBCs, PCV and lymphocytes in animals received hydroxyurea comparing with the normal values and the decrease was dose dependent manner.
Hydroxyurea, Acute toxicity, LD50, Blood parameters
INTRODUCTION: Hydroxyurea (HU) is a non-alkylating anti-proliferative and antiviral agent having already been used for a diversity of neoplastic and non-neoplastic conditions. Hydroxyurea was first produced in 1869 in Germany by Dressler and Stein. It was FDA approved in 1967 and it is essential in the management of chronic myelo-proliferative disorders (MPDs), including chronic myelogenous leukemia, essential thrombocythemia, polycythemia vera and primary myelofibrosis 1. The studies showed that hydroxyurea induce fetal haemoglobin synthesis 2. The doses used in patients with sickle-cell anaemia are 25 mg/kg b.w per day in children and up to 35 mg/kg b.w per day in adults 3.
The mechanism of this drug summarized by reduction of ribonucleotides and deoxyribo-nucleotides through the inactivation of ribonucleotide reductase, limiting DNA biosynthesis that’s it 4. Hydroxyurea is already absorbed from the human and lab animals gastrointestinal tract, with some of species variation among subjects. The half-time of hydroxyurea is short, with an initial half-time of 0.63 h after IV administration and 1.78 h after oral administration and a terminal half-time of 2-4 hrs after oral administration and 3.39 hrs after intravenous administration 5.
In 2016 (OSHA) 6 recorded that hydroxyurea was embryotoxic and teratogenic in rats and rabbits at doses 0.8 times and 0.3 times, respectively, also it is mutagenic in-vitro to bacteria, fungi, protozoa, and mammalian cells, therefore it is aclastogenic in-vitro and in-vivo. Animal studies have revealed that hydroxyurea crosses the placenta and harmful to the conceptus is associated with embryotoxicity, malformations, growth retardation, and impaired learning ability 7.
In this study we are focused on the acute oral toxicity in mice and the histopathological and hematological effect after 24 hr of exposure to high doses.
MATERIAL AND METHODS:
Animals: Total number (8) male albino mice with body weight range (25-30) g and age (2-3) month. The animals were raised and bred in cages of (318x202x135mm) dimensions and left one week before beginning the study for acclimatization in the animal house of College of Veterinary Medicine/Al-Qasim green University from 22 February 2017 to 10 July 2017. Tap water and standard pellet was provided ad-libitum. Hydroxurea (Hydra®) obtained from Deva pharmaceuticals.
Acute Toxicity Study: The median lethal dose LD50of hydroxurea measured by "up-and-down" method 8. This test summarized by dosing individual animals in sequence singly doses at 24 h intervals, with the initial dose set at "the toxicologist's best estimate of the LD50". Following each death the dose was lowered; following each survival, it was increased, according to a pre specified dose progression factor.
Hematological Analysis after Acute Toxicity: Two survival animals received hydroxyurea at 7000 mg/kg. b.w and 7500 mg/kg. b.w respectively orally comparing with the normal values of blood parameters as control. The blood collected from heart puncture after general anesthesia by using (Ketamine and xylazine). By using Uto-analyzer vet we are estimate (RBC, WBC, PCV, HB and Lymphocyte). The procedure done according to manufactured instruction.
Histopathological Changes: Liver, spleen and bone marrow were obtained after 24 hrs of exposed and fixed in 10 % formaline. Decalcification of homer bone by (formic acid and sodium citrate) to obtain bone marrow. Paraffin sections of thickness of 3 - 4 ?m were prepared and stained with hemato-xylin and eosin (H and E) for histopathological examination under light microscopy.
Acute Toxicity Study: This study revealed that the LD50 of hydroxyurea according to 8. The acute toxicity symptoms which were observed after dosing the animals include, grooming, piloerection, anorexia. Muscular tremor, convulsion and after three hours coma and death (the severity of symptoms was positively proportional to the dose).
The previous signs that appear when exposed mice to high doses of hydroxurea may be due to the mechanism of action of hydroxurea which included produced of ROS 9. Furthermore the high volume of chemotherapeutic agent in stomach may be attributed to show these signs.
TABLE 1: THE TOXIC SYMPTOMS AND MORTALITY OUTCOME THAT DEVELOPED ACCORDING TO DIFFERENT DOSES OF HYDRXUREA IN MALE ALBINO MICE ACCORDING TO UP AND DOWN METHOD 8
|Dose of Hydra||Clinical signs during 24 hours||X or O|
|6000 mg/kg. b.w||Depression, shallow breathing||O|
|6500 mg/kg. b.w||Grooming, piloerection, anorexia, muscular tremors, convulsions, recovery after 3 hours||O|
|7000 mg/kg. b.w||Grooming, piloerection, anorexia, muscular tremor, depression and convulsions,
Recovery after 4 hours
|7500 mg/kg. b.w||Depression, shallow breathing, restlessness, convulsion,
Anorexia, muscular tremor recovery within 13 hours
|8000 mg/kg. b.w||Grooming, lethargy, diarrhea, depression, recumbence comaand death within24 hours||X|
|7500 mg/kg. b.w||Anorexia, muscular tremor, grooming, crippled||O|
|8000 mg/kg. b.w||Grooming, lethargy, diarrhea, depression, recumbence coma and death after 20 hours||X|
|7500 mg/kg. b.w||Grooming, piloerection, tremor, depression crippled and recumbence recovery after 24 hours||O|
O: survival, X: death
TABLE 2: ESTIMATE THE ORALLY LD50 OF HYDROXUREA IN MALE ALBINO MICE BY USING UP AND DOWN METHOD 8
mg / kg b.w
mg / kg b.w
|Results after 24 hours||Different between
|LD50 mg/kg b.w|
O = Survive animal, X = Dead animal LD50 = xf + kd
Xf = last dose administrated K = value from appendix
d = difference between dose levels
LD50= 7500 + (0.737) * 500 = 7868.5 mg / kg b.w orally hydroxurea in mice.
So we are confirm with Bristol-Myers 10 which were recorded that large doses of hydroxurea may be produce drowsiness Neurological disturbances, headache, dizziness, disorientation, hallucinations and convulsions.
The Food and Drug Administration 7 recorded that hydroxyurea LD50 in mice was 7330 mg/kg. b.w orally for 24 hrs while in rats at 5,780 mg/kg was lethal following a single dose. The toxicities observed in this study can be explained in most cases by the published mechanisms of action of it. Hydroxyurea is rapidly metabolized to a carbo-moylnitroso intermediate and then to nitroxide compounds (including nitric oxide) that are responsible for physiologic and toxic effects 9. These nitroxides act as free radicals, interfering with electron transfer, facilitating formation of reactive oxygen species inducing oxidative stress, interacting with nucleic acids and proteins to impair cellular functions, and altering cell signaling 9.
Some of Hematological Parameters after Acute Administration of Hydroxyurea: These results showed they were an increase in hemoglobin level in animals received 7000 mg/kg. b.w and 7500 mg/kg. b.w as orally single dose comparing with the normal values in male albino mice. While they were reduction in RBCs, WBC, PCV and lymphocyte comparing with normal values.
TABLE 3: SHOW THE EFFECT OF HIGH DOSES OF HYDROXYUREA ON BLOOD PARAMETERS AFTER 24HR OF ORAL ADMINISTRATION AND COMPARING WITH NORMAL VALUES
7000 mg/kg. b.w
7500 mg/kg. b.w
|Normal Values according to
Laurie M et al., 2003
FIG. 1: SHOWING THE SPLEEN OF MICE RECEIVED 7500 mg/kg. b.w OF HYDROXUREA BEFORE 24 HRS
There is deposition of brown pigment (hemosedrin) with sever hemorrhage in the lymphoid tissue with necrosis
FIG. 2: SHOWING BONE MARROW OF MICE RECEIVED 7500 mg/kg. b.w OF HYDROXUREA BEFORE 24 h. There is proliferation of polymorphous nucleic cells and amyloid accumulation in bone marrow and necrosis in some of these polymorphous cells mainly neutrophils with mild hemorrhage in bone marrow.
FIG. 3: SHOWING THE LIVER OF MICE RECEIVED 7500 mg/kg. b.w OF HYDROXUREA BEFORE 24 h. There is sever vacuolation and swelling of hepatocytes with presence vacuoles in there cytoplasm (hydropic degeneration) and congestion of central vein with infiltration of inflammatory cells.
DISCUSSION: The results showed there in an reduction in RBCs, WBC, PCV and lymphocyte counts (Table 3), in animals received 7000 mg/kg. b.w and 7500 mg/kg. b.w respectively as orally single dose compare with normal values that mentioned from (Laurie M, et al., 2003) 11. On the other hand the hemoglobin level showed an increase (16.12 g/dl and 16.98 g/dl) in tow animals received 7000 mg/kg. b.w and 7500 mg/kg. b.w respectively as orally single dose comparing with the normal values of hemoglobin in albino mice that recorded by Laurie M, et al., 2003 which was (14.8 g/dl). It is enter the cells via passive diffusion and crosses the blood brain-barrier 12. Then con-centrated in erythrocytes and leukocytes 10.
Furthermore hydroxyurea is still the only FDA approved drug for hemoglobin induction in sickle cell disease 13. From the previous information it is clear to us that hydroxurea effected mainly on RBCs and WBCs. Many researchers strongly suggested that the serious toxicity of hydroxyurea is not due to its ability to inhibit DNA synthesis, but also its ability to produce ROS leading to oxidative stress and cell death 4. Therefore that’s may be due to the cause of decreases in (RBCs, WBCs, PCV and Lymphocytes) in present study. While the increase in Hb level may be due to ability of hydroxurea to acceleration of erythropoiesis and that enhances the chance of produce immature RBC (hydroxurea cytotoxicity). And that’s lead to increase of Hb. The histopathological slide of liver of mice received 7500 mg/kg. b.w as single lethal dose showed there is sever vacuolation and swelling of hepatocytes with presence of vacuoles in there cytoplasm (hydropic degeneration), congestion of central vein with mild infiltration of inflammatory cells (Fig. 3).
Therefore the bone marrow slide showed there is proliferation of polymorphous nucleic cells and amyloid accumulation in bone marrow and necrosis in some of these polymorphous cells mainly neutrophils with mild hemorrhage in bone marrow (Fig. 2). While the spleen lesion was sever vacuolation and swelling of hepatocytes with presence vacuoles in there cytoplasm (hydropic degeneration) and congestion of central vein with infiltration of inflammatory cells. (Fig. 1). These lesions may be due to the rapid production of (ROS) it is started after 2 hours of hydroxurea exposure and cell death 4. By reaction of hydroxylamine moiety with O2 moiety to produce H2O2 and hydroxyl radical (OH-) these radicals pass to tissues by passive diffusion and caused the previous lesions in bone marrow and spleen by the other hand the lesions that’s arising in liver tissue may be due to converted of hydroxurea to urea in liver (the main site of hydroxurea metabolism) of mice as a direct reduction catalyzed by enzymes present in most subcellular fractions of liver homogenates 14.
We are in agreement with 15 who recorded that Hydroxyurea increases the serum level of total Hb, HbF, MCH and MCV. Furthermore, it increases transfusion intervals and significantly improves clinical abnormalities. Other researchers Rassnick et al., 2010 16 founded that hydroxyurea cause decreased in granulocytes, erythrocytes and platelets reported in humans and cainine. Also we are corresponding with Gift D, et al., 2015 who recorded that hydroxyurea increased HbF level in anemic primates.
CONCLUSION: The acute oral administration of hydroxyurea in male albino mice caused slightly toxic effects, It was also noted the presence of effects on some blood components (RBCs, WBCs, PCV, Hb and lymphocytes).
ACKNOWLEDGEMENT: The authors are thankful to Dr. Zahraa M Ayad and Dr. Ameer Redha Derwall, for there their motivational support and guidance.
CONFLICT OF INTERESTS: Declared None.
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How to cite this article:
Al-ameedi AI, Al-Ani MM and Sahib BS: Acute toxicity of hydroxyurea in male albino mice. Int J Pharm Sci Res 2018; 9(7): 2960-64. doi: 10.13040/IJPSR.0975-8232.9(7).2960-64.
All © 2013 are reserved by International Journal of Pharmaceutical Sciences and Research. This Journal licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.
A. I. Al-ameedi *, M. M. Al-Ani and B. S. Sahib
Department of Physiology Pharmacology, Collage of Veterinary Medicine Al-Qasim Green University, Iraq.
16 October, 2017
19 December, 2017
25 December, 2017
01 July, 2018