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Histological effects of chronic sodium fluoride toxicity on some reproductive organs of male and female adult albino rats

    Authors

    • Hadil B. Al-Sabaawy 1
    • Bushra I. Al-Kaisie 2

    1 Department of Pathology and Poultry Diseases, College of Veterinary Medicine, University of Mosul, Mosul, Iraq

    2 Department of Pathology and Poultry Diseases, Collage of Veterinary Medicine, University of Baghdad, Baghdad, Iraq

,

Document Type : Research Paper

10.33899/ijvs.2020.127896.1540
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Abstract

The current study aimed to determine the pathological effects of chronic poisoning with sodium fluoride on some reproductive organs like ovary, and testis of adult’s male and female albino rats. Thirty-six male and female adult’s albino rats were divided into six groups. The first and second group of male and female rats are control groups was given tap drinking water, the third and fourth groups of male and female rats was given 150 ppm of NaF, the fifth and sixth group of male and female rats was given 300 ppm of NaF respectively for 90 days. The weights of male and female genital were recorded. Histological exam of control groups of female rats showed the typical histological structure of the ovary, while the NaF treated groups showed a decrease in growing follicles, in addition to thickening in tunica albuginea and deposition of eosinophilic material. In male control groups, the sections showed the typical histological structures of the testis, while the treated groups showed multinucleated spermatids in addition to the deposition of amorphous eosinophilic material in the interstitial tissue, coagulative necrosis, in addition to apoptotic and sloughed spermatogonia in the lumen of seminiferous tubule. These results indicate that sodium fluoride with 300 ppm has toxic effects on organ body weights and on the histology of the gonads of adult’s male and female albino rats.

Keywords

  • sodium fluoride
  • Ovary
  • Testis
  • Histopathology
  • Chronic toxicity

Main Subjects

  • General Pathology

Full Text

Histological effects of chronic sodium fluoride toxicity on some reproductive organs of male and female adult albino rats

 

 H.B. Al-Sabaawy1 and B.I. Al-Kaisie2

Department of Pathology and Poultry Diseases, Collage of Veterinary Medicine, University of Mosul, Mosul, Department of Pathology and Poultry Diseases, Collage of Veterinary Medicine, University of Baghdad, Baghdad, Iraq

 

hadeelbasim2006@gmail.com, 0000-0001-8077-0854

bushra.e@covm.uobaghdad-edu.iq, 0000-0003-1944-0017

 

2020-08-05

2020-09-16

 

Abstract

The current study aimed to determine the pathological effects of chronic poisoning with sodium fluoride on some reproductive organs like ovary, and testis of adult’s male and female albino rats. Thirty-six male and female adult’s albino rats were divided into six groups. The first and second group of male and female rats are control groups was given tap drinking water, the third and fourth groups of male and female rats was given 150 ppm of NaF, the fifth and sixth group of male and female rats was given 300 ppm of NaF respectively for 90 days. The weights of male and female genital were recorded. Histological exam of control groups of female rats showed the typical histological structure of the ovary, while the NaF treated groups showed a decrease in growing follicles, in addition to thickening in tunica albuginea and deposition of eosinophilic material. In male control groups, the sections showed the typical histological structures of the testis, while the treated groups showed multinucleated spermatids in addition to the deposition of amorphous eosinophilic material in the interstitial tissue, coagulative necrosis, in addition to apoptotic and sloughed spermatogonia in the lumen of seminiferous tubule. These results indicate that sodium fluoride with 300 ppm has toxic effects on organ body weights and on the histology of the gonads of adult’s male and female albino rats.

 

Keywords: Sodium fluoride, Ovary, Testis, Histopathology, Chronic toxicity

 

التأثیرات النسجیة للتسمم المزمن بفلورید الصودیوم على بعض الأعضاء التناسلیة لذکور وإناث الجرذان البیض البالغة

 

 هدیل باسم ذنون1 و بشرى إبراهیم القیسی2

 

1فرع الأمراض وأمراض الدواجن، کلیة الطب البیطری، جامعة الموصل، الموصل، 2فرع الأمراض وأمراض الدواجن، کلیة الطب البیطری، جامعة بغداد، بغداد، العراق

 

الخلاصة

 

هدفت الدراسة الحالیة لتحدید التأثیرات المرضیة للتسمم المزمن بمادة فلورید الصودیوم على بعض الأعضاء التناسلیة مثل المبیض والخصیة لذکور وإناث الجرذان البیض البالغة. تم استخدام 36 حیوان من ذکور وإناث الجرذان حیث قسمت إلى ستة مجامیع. المجموعة الأولى والثانیة من ذکور وإناث الجرذان مثلت مجموعة السیطرة والتی أعطیت ماء شرب الحنفیة، المجموعة الثالثة والرابعة من ذکور وإناث الجرذان أعطیت مادة فلورید الصودیوم وبترکیز 150 جزءا بالملیون، المجموعة الخامسة والسادسة أعطیت مادة فلورید الصودیوم وبترکیز 300 جزء بالملیون ولمدة 90 یوم وعلى التوالی، تم حساب أوزان الحیوانات على ثلاثة مراحل خلال فترة التجربة، لم تظهر مجامیع السیطرة لإناث الجرذان أیة تغیرات مرضیة على الترکیب الطبیعی لنسیج المبیض. بینما أظهرت المجامیع المعاملة بالمادة قلة فی أعداد الجریبات النامیة والنسیج الخلالی الکیسی بالإضافة إلى حصول تثخن بالغلالة البیضاء مع وجود ترسب المادة الحامضیة، أما مجامیع السیطرة لذکور الجرذان فقد أظهرت الترکیب الطبیعی للخصیة. بینما أظهرت المجامیع المعاملة وجود خلایا نطفیة متعددة الانویة مع مادة حامضیة متجانسة خلال النسیج الخلالی مع وجود النخر التجلطی، إضافة إلى انسلاخ وموت الحیوانات المنویة فی الخلیة المولدة للنطف وتجاویف النبیبات المنویة. وتشیر هذه النتائج إلى أن مادة فلورید الصودیوم وبترکیز 300 جزء بالملیون لها تأثیر سمی على وزن الجسم بالإضافة لتأثیره على القند الذکریة والأنثویة للجرذان.

 

Introduction

 

Fluoride is a natural element existing in the environment, prolonged exposure to fluoride (F) in air, soil and water, resulting in accumulation of these ions in the body by forming salts, mainly in the bones so that fluoride level above 3-6 mg/L may lead to skeletal fluorosis and in teeth, the level above 1.5 mg/L lead to dental fluorosis in both human beings and domestic animals (1,2). Fluoride has both useful and mischievous effects on public health; several studies indicate that fluoride in low concentration is fundamental for both man and animals especially for growth and development of teeth and bones (3) chronic exposure to fluoride have disruptive effects on various tissues of body like apoptosis, neurological disorder, gastrointestinal disturbances and reproductive system dysfunctions, hemorrhage and cardiac arrest (1,4). Multiple investigations refer to a relationship between long-dated fluoride exposure and impairment of fertility thus, various experimental on mice, rabbit, Guinea big and rats refers to adverse effects of sodium fluoride on the reproductive function of it (5,6) many researchers refer to modification in histological structures, reproductive hormone changes, fertility (7) and changes in organ body weight; the deleterious effects of sodium fluoride can be reduced by using different materials such as pomegranate seed oil (8), as well as the toxic effect of sodium nitrate can be reduced by ascorbic acid (9).

Therefore, the current work aimed to study the toxic effects of sodium fluoride on the male and female gentile system that exposed to different concentration of it.

 

Materials and methods

 

Animals housing

Animals numbers for this experimental study is 36 adult’s male and female albino rats weighing 180-200 gm. These animals were adopted in the animals housing of Collage of Veterinary Medicine at the University of Mosul, it divided randomly into six groups (Table 1). All treated groups were providing with these materials for 90 days. Animals were housed under strict care, hygienic condition and ventilation with alight dark 12:12 cycle under standard temperature 24±26ºC and the whole body weight of these animals was checked at three stages during the experimental period at the end of these experimental animals were sacrificed. The male and female gonads were excised, and weighed and all sample were processed for histopathological examinations.

 

Table 1: Experimental protocol

 

Groups

Treatment

Duration of exposure

Number of animals

Control male

water tap

90 days

6 male

Control female

water tape

90 days

6 female

150 ppm male

fluoridated water

90 days

6 male

150 ppm female

fluoridated water

90 days

6 female

300 ppm male

fluoridated water

90 days

6 male

300 ppm female

fluoridated water

90 days

6 female

 

Histopathological analysis

Dissected tissue of testes was fixed in Bouin’s solutions for 24hrs. At the same time, the rest organs fixative in 10% of neutral buffer formalin and processed by the traditional way (concatenation of alcohol dilution for dehydration, cleared up by xylene, blocked in the wax of paraffin and the thickness of section is 3-4 nm which were sliced by using the microtome and stained by Hematoxylin and Eosin (H&E) according to (10) and finally examined under the light microscope and the histological changes were visualized by using a digital camera and magnified to the required size.

 

Statistical analysis

To determine the toxic effects of sodium fluoride on animal’s body, all collected data were analyzed by using one-way ANOVA and the moral differences for all tests are determined at P

 

Results

 

The relative weight of the male genitalia

The treatment with sodium fluoride resulted in a significant decrease in testicular weight in the treated groups compared to the control group (Table 2). The results showed a significant decrease in body weight, head, and epididymis tail in all treatments compared to the control group (Table 2). Treatment of adult male rats with sodium fluoride caused a significant decrease in prostate weight in the treated groups compared to the control group (Table 2). A significant decrease was observed in the weight of seminal vesicles of male rats treated with sodium fluoride compared to the control group (Table 2).

 

Table 2: The effects of sub-lethal concentration of sodium fluoride on male genitalia organs weight

 

Organs

Mean ± SE (n=6)

Control

150 ppm

300 ppm

Testis

539.00017 ± 15.001893a

400.09850 ± 19.739748b

329.87200 ± 10.798784c

Prostates

406.44100 ± 13.381972a

339.60300 ± 13.732154b

254.35150 ± 4.016649c

Seminal vesicles

440.93000 ± 12.618307a

359.73433 ± 12.220198b

379.16650 ± 1.863315b

Head of epididymis

98.60233 ± 1.354218a

87. 7560 ± 1.485420b

88.14767± 1.492998b

Tail of epididymis

109.40750 ± 1.767612a

85.72583 ± 3.156051b

89.62900 ± 1.325094b

- Horizontally different letters mean that there is a significant difference between the groups at P<0.05.

 

The relative weight of the female genitalia

The results of the present study showed that there was a significant decrease in the weight of female genital organs and all transactions compared to the control group as shown in the (Table 3), The treatment groups did not show a significant difference between them.

 

Table 3: The effects of sub-lethal concentration of sodium fluoride on female gentile organs weight

 

Organs

Mean ± SE (n=6)

Control

150 ppm

300 ppm

Ovary

30.57983±0.956699a

24.49367±1.803669b

23.37150±2.779209b

Horn of the uterus

360.26533±7.0528504a

226.47100±25.5573b

214.99733±9.008086b

- Horizontally different letters mean that there is a significant difference between the groups at P<0.05.

 

Effects of sodium fluoride on the histological structure of male and female rats

In control groups, the normal histology of ovary was (Figure 1), late tertiary follicle (preovulatory follicle) in addition to developing and growing of primordial follicles (Figures 2,3) which associated with theca luteal cell, tunica albuginea and epithelium of ovarian surfaces. The figure 4 showed antral follicle (late tertiary follicle) in addition to primordial follicles. While figure 5 showed secondary follicles with different stage of developing. The figure 6 showed thinking in tunica albuginea as well as there is deposition of eosinophilic materials with many primordial.

 In group administrated with 300 ppm of NaF showed multiple ovulation with one atretic follicle (Figure 7), as well multi-layer primary follicles are present (Figure 8). Massive vacuolar degeneration in the cell of theca extern (Figure 9), increase in the thickness of tunica albuginea (Figure 10). congestion of blood vessels and vacuolar degeneration in luteal cell (Figure 11).

The control groups of male rats show the typical composition of seminal tubules with the complete stage of spermatogenesis, Leydig cell with supplying of blood (Figures 12,13). In 150 ppm groups the testes organs show multinucleated spermatid with amorphous eosinophilic material in the interstitial tissue with degenerative cell in the stage of spermatid cell (Figures 14,15). While in 300 ppm groups showed massive coagulative necrosis which appears as debris with complete absence of spermatozoa (Figure 16), as well as there is a deposition of amorphous eosinophilic material and thickening in tunica vaginalis (Figure 17). The figure 18 showed increase in the thickness of tunica vaginalis in addition to coagulative necrosis in the endothelial cell of seminal tubules.

 

 

 

Figure 1: Control group, Ovary, Normal composition of ovarian tissue, many primordial follicles (arrow) with two antral follicles (mature preovulatory follicle (blue arrows) (H&E, 10x).

 

 

 

Figure 2: Control group, Ovary Normal composition of ovarian tissue showing developing and growing follicles included primordial follicles (arrow), primary follicles (arrow). (H&E, 10x).

 

 

 

Figure 3: Control group, Ovary, Normal composition of ovarian tissue showing ovarian surface epithelium (arrow), tunica albuginea (arrow) and theca luteal cells (arrow) (H&E, 400x).

 

 

 

Figure 4: 150 PPM group. Ovary. Showing two antral follicles (arrow) with multiple secondary follicles (arrow). H&E, 100x.

 

 

 

Figure 5: 150 PPM group. Ovary. Showing secondary follicles at a different stage of developing (arrow). H&E, 100x.

 

 

 

Figure 6: 150 PPM group. Ovary. Showing ovarian surface epithelium (arrow), thickening in tunica albuginea (arrow), many primordial follicles (arrow), deposition of eosinophilic materials (arrow). H&E, 400x.

 

 

 

Figure 7: 300 PPM group Ovary. Case of multi ovulation with atrial follicles (arrow) and atretic follicle (arrow) with two distinct corpus luteum (star). H&E, 100x.

 

 

 

Figure 8: 300 PPM group. Ovary. Showing the presence of multilayer layer follicle (arrow). H&E, 400x.

 

 

 

Figure 9: 300 PPM group. Ovary. Showing massive vacuolar degeneration in theca externa cells (arrow). H&E, 400x.

 

 

 

Figure 10: 300 PPM group. Ovary. Showing an increase in the thickness of tunica albuginea (arrow) and vacuolar degeneration in ovarian surface epithelial cells (arrow) H&E, 400x.

 

 

 

Figure 11: 300 PPM group. Ovary. Showing congestion in blood vessels (arrow) and vacuolar degeneration in luteal cells (arrow).

 

 

 

Figure 12: Control group. Testis. Showing the typical composition of seminal tubules with complete stages of spermatogenesis. H&E, 400x.

 

 

 

Figure 13: Control group. Testis. Showing the typical composition of seminal tubules with complete stages of spermatogenesis, and Leydig cells with blood supply. H&E, 400x.

 

 

 

Figure 14: 150 PPM group. Testis. Showing multinucleated spermatids (arrow) in the lumen of seminal tubules with amorphous eosinophilic material in the interstitial tissue (arrow). H&E, 400x.

 

 

 

Figure 15: 150 PPM group. Testis. Showing apoptotic and sloughed spermatogonia (arrow) in the lumen of seminiferous tubules with coagulative degeneration in the spermatid cell stage (star). H&E, 400x.

 

 

 

Figure 16: 300 PPM group. Testis. Showing massive coagulative necrosis in spermatid cell stage (star), which appears as cellular debris (arrow) with complete absence of spermatozoa with few apoptotic figures at periphery. H&E, 400x.

 

 

 

Figure 17: 300 PPM group. Testis. Showing deposition of amorphous eosinophilic material between tubules (star). H&E, 400x.

 

 

 

Figure 18: 300 PPM group. Testis. Showing an increase in the thickness of tunica vaginalis (arrow) with coagulative necrosis in the endothelial cell of seminal tubules (star). H&E, 400x.

 

Discussion

 

The current work shows a significant reduction organs weight of the NaF treated groups as compared to the control groups, and this may be due to adverse effects of this materials on the physiological status of animals and due to changes in the metabolism of mechanism sodium fluoride causing inhibition inactivity of some enzyme that disrupted the metabolic processes like the synthesis of protein, glycolysis, and antioxidant. All these changes leading to a reduction in organs weights, we're in agreement with the results of the Kumar et al, (12) and contradicted with the result of the Chioca et al, (13) who mentioned that NaF doesn't alter the weights of organs and body weights. The ovary is an significant organ of numerous reproductive toxicants and female rats reproductive functions that exposed to NaF was markedly decrease and destroy, and this effects may have been caused by ovarian abnormality, and due to toxicity exposure to NaF, the histopathological changes in the treated groups showed a decrease in the number of Graafian follicles with increase numbers of growing follicles, in addition to different stage of developing of atretic follicles and these results are in accordance with the Farooqi and Maity et al, (14,15) which assign the decrease in the number of Graafian follicles to reduced number of cell, division of it, and to differentiation in germ cell through oogenesis. In rat’s male genital system, testis and epididymis typical structures and the equilibrium between the secretion of estrogen and androgen are critical for maturation of sperm and formation of spermatogenesis, abnormality in function, structures, morphology of sperm not only impact the quality of semen, but also leading to infertility. The testis produce sperm in the male genital system; the structure of testis is necessary for maintaining the spermatogenesis, exposure to fluoride could cause apparent damage in the testis by necrosis and degeneration of seminiferous tubules (16). Also, changes in the structure of the spermatogenic cell, cause the maturation and differentiation of spermatocytes (17). At the current study sodium fluoride treatment for 90 days significantly destroy the histological structures of testis through damage of seminiferous tubules, by inducing necrosis, deposition of eosinophilic material with thickening in the tunica vaginalis (15).

 

Conclusions

 

The current work results suggest that ingestion of NaF have adverse effects on the body and the reproductive organ weight. On the reproductive function of male and female albino rats, these effects are more pronounced with increasing dose of the sodium fluoride.

 

Acknowledgement

 

I would like to appreciate the effort of the College of Veterinary Medicine, University of Mosul, and College of Veterinary Medicine, the University of Baghdad for supporting this research.

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Iraqi Journal of Veterinary Sciences
Volume 35, Issue 4 - Issue Serial Number 4
October 2021
Page 705-711
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History
  • Received: 05 August 2020
  • Revised: 01 September 2020
  • Accept: 16 September 2020
  • Publish: 25 July 2021
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APA

Al-Sabaawy, H. B., & Al-Kaisie, B. I. (2021). Histological effects of chronic sodium fluoride toxicity on some reproductive organs of male and female adult albino rats. Iraqi Journal of Veterinary Sciences, 35(4), 705-711. doi: 10.33899/ijvs.2020.127896.1540

MLA

Hadil B. Al-Sabaawy; Bushra I. Al-Kaisie. "Histological effects of chronic sodium fluoride toxicity on some reproductive organs of male and female adult albino rats". Iraqi Journal of Veterinary Sciences, 35, 4, 2021, 705-711. doi: 10.33899/ijvs.2020.127896.1540

HARVARD

Al-Sabaawy, H. B., Al-Kaisie, B. I. (2021). 'Histological effects of chronic sodium fluoride toxicity on some reproductive organs of male and female adult albino rats', Iraqi Journal of Veterinary Sciences, 35(4), pp. 705-711. doi: 10.33899/ijvs.2020.127896.1540

VANCOUVER

Al-Sabaawy, H. B., Al-Kaisie, B. I. Histological effects of chronic sodium fluoride toxicity on some reproductive organs of male and female adult albino rats. Iraqi Journal of Veterinary Sciences, 2021; 35(4): 705-711. doi: 10.33899/ijvs.2020.127896.1540

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