Variation of thyroid hormones
The results presented in Table 1 demonstrate a significant (P<0.05) elevated in serum TSH levels and a significant (P<0.05) decline in T3 and T4 levels in rats subjected to thyroidectomy (Thy) compared to the control and CSE groups. However, management of thyroidectomized rats with Chia seeds extract (Thy+CSE) significantly (P<0.05) elevated T3 and T4 levels and significantly (P<0.05) decline TSH levels compared to the thyroidectomized male rats (Table 1).
Sperms change
Table 2 showed a significant decline (
P<0.05) in sperm counts, motility, progressive motility (PR), vitality, morphology index (%) and a significant elevated sperm abnormality, immotile (IM) sperms in thyroidectomies rats (Thy) as compared to control group and CSE groups. In contrast; a significant elevate (
P<0.05) in sperm counts, motility, progressive motility (PR), vitality, morphology index (%) and a significant decrease in sperm abnormality, immotile (IM) sperms in treated thyroidectomies rats with coriander (Thy+ CSE) as compared to thyroidectomies rats (Table 2).
Chia seeds extractameliorated experimentally hyperthyroidism-induced testicular DNA damage
The results presented in Table 3 indicate that thyroidectomized rats (Thy) revealed a significant decline in sexual hormone levels (testosterone, FSH, prolactin and LH) and a significant elevated in testicular enzyme levels (AST and ALP) compared to the control rats and treatment group with chia seeds extract (CSE). On the other side, operated thyroid rats treated with CSE (Thy+CSE) showed a significant elevation in sexual hormone levels and a significant decline in testicular enzyme levels compared to thyroidectomized rats (Thy).
Furthermore, Table 5 demonstrates that thyroidectomy led to a substantial increase in lipid peroxidation (MDA content) and a significant decline in antioxidant defense markers (GSH content, GST and SOD activity) in testicular cells compared to the control and the treatment group treated with CSE. In contrast, treatment of thyroidectomized rats with CSE (Thy+ CSE) resulted in a remarkable decrease in MDA content and a significant increase in GSH content, CAT and activities of SOD compared to the thyroidectomized group (Thy) (Table 4).
A comet assay was done to evaluate the protective affection of Chia seeds extract (CSE) against hypothyroidism-induced testicular DNA damage in rats following thyroidectomy. The aims of the comet assay, presented in Fig 1 and Table 5, demonstrated that thyroidectomized rats exhibited a significant elevate in testicular damage of its DNA as provided by increasing tail length, tail DNA% and tail moment compared to the control group and treatment group with CSE (p < 0.05). However, the administration of CSE to treat hypothyroidism resulted in a significant decline in damage to testicular DNA. It is worth noting that no significant variety in DNA damage, specifically in terms of tail length, was marked in rats treated with CSE alone. These results suggest that Chia seeds extract have a protective feature against thyroidectomy-induced hypothyroidism and subsequent damage of testicular DNA in rats, as evidenced by the reduction in DNA damage parameters following treatment with CSE.
CSE ameliorated testicular injury of thyroidectomy
Disturbance in spermatogenic cells arrangements with depletion in sperms counts and leydig cells in testes of thyroidectomies rats as compared to testes in control and CSE that exhibit the natural structure of seminiferous tubules with the natural cycle of spermatogenesis (Fig 2A-2C). Treatments of thyroidectomy rats exhibit recovery in testicular injury and elevate the sperm numbers and Leydig cells (Fig 2D).
PCNA expression in different groups
Strong reactions for PCNA expression were detected in the spermatogenic cell on seminiferous tubules in control and CSE while mild PCNA expressions were detected in the thyroidectomy rats (Fig 3A-3C). In contrast; moderate PCNA expressions were detected in treated thyroidectomies rats with CSE (Thy+CSE) (Fig 3D).
Sex hormones are significantly and significantly impacted by thyroid gland health, particularly in men. The thyroid gland in both hypothyroidism and hyperthyroidism is crucial for sperm quantity and quality, which are both aspects of fertility
(Beltagy et al., 2016; Alankooshi et al., 2023). The current study’s main goal was to examine the potential of Chia seeds extract (CSE) in mitigating testicular injury, damage of DNA and oxidative Stress resulting from thyroidectomy operation in male rats. the Results of the research align with the Results of a previous Study By which demonstrated the critical protective effects of Chia seeds extract against the effects of hypothyroidism and thyroid damage of tissue induced by potassium dichromate.
Current results revealed that; thyroidectomy induced hypothyroidism and therefore it elevated TSH and depleted T3 and T4 levels in contrast to rats used as controls. Treatments with CSE (Thy+CSE ) enhanced these differences in thyroid hormone concentrations and brought normal hormone conditions to operated thyroidectomy rats. The current finding is accepted by those of
Tousson et al., (2012c, 2014) and
Alankooshi et al., (2023), who found that; thyroidectomy induces hypothyroidism.
The findings of the current research demonstrated that thyroidectomy led to a decline in sexual hormones (FSH, LH, total testosterone and prolactin) as well as sperm count, morphological index, vitality and progressive motility while increasing non-progressive and immotile sperm. These findings are consistent with the study conducted by
Jalilvand et al., (2019), which found that the effects of hypothyroidism resulted in damage to testicular cells and decreased sperm counts. Similarly,
Alankooshi et al., (2023) reported that hypothyroidism induced reproductive toxicity.
The use of chia seeds extractwas found to have a steroidogenic effect, potentially by indirectly increasing testosterone levels through the inhibition of testosterone metabolism. The mechanism behind chia seeds extract testosterone-increasing properties is believed to involve its role as an aromatase inhibitor, an enzyme responsible for converting testosterone to estrogen
(Dhawan et al., 2002). Treatment with chia seeds extractin thyroidectomized rats resulted in the modulation and improvement of sexual hormones and semen parameters. This included an elevation in testosterone levels, increased sperm production, a decrease in sperm abnormalities and a reduction in testicular tissue oxidative stress, possibly due to the antioxidant activity of chia seeds extract.
These findings are similar to studies by
Alankooshi et al., (2023), which reported similar outcomes. Furthermore, the results align with the research by
Patat et al., (2007) which highlighted the protective effects of chia seeds extract against spermatogenic damage and decreased sperm count and testosterone levels induced by chromium, as well as its role in enhancing antioxidant defence demonstrated that chia seeds extract had a protective effect on sperm abnormalities by improving the percentage of rapid progressive motility and slow progressive motility types for sperms while significantly decreasing the percentage of non-progressive and immotile sperms in metronidazole-treated mice. These findings are consistent with
Fetouh and El-Saied Azab (2014), who found that chia seeds extract improved daily sperm production in guinea pigs with gentamicin-induced reproductive toxicity.
Furthermore, our results align with the result by
Noorafshan et al., (2010), which showed that chia seeds extract reduced the production of highly reactive oxygen species (ROS), which are known to produce oxidative stress and damage to cells. Increased ROS production disrupts the redox balance and leads to oxidative stress, as highlighted by
Altwaijry et al., (2020). In our analysis, thyroidectomy significantly changed the condition of oxidant/antioxidant balance, consistent with previous findings by
Tousson et al., (2014). Specifically, thyroidectomy led to elevated levels of malondialdehyde (MDA) and declined levels of reduced glutathione (GSH), glutathione-S-transferase (GST) and superoxide dismutase (SOD) activity in testicular tissues. However, treatment with Chia seeds extract (CSE) in thyroidectomized rats improved these changes.
These observations are in line with the results of
Noorafshan and Ashkani-Esfahani (2010), who showed that Chia seeds extract acts as an antioxidant by preventing the formation of free radicals and lipid peroxidation in various tissues.
The current findings indicate that thyroidectomy leads to DNA damage in testicular tissues, disruption in the arrangement of spermatogenic cells, decreased sperm counts and reduced expression of proliferating cell nuclear antigen (PCNA) in spermatogonia. These effects are likely responsible for the testicular damage and reduction in sperm production observed after thyroidectomy. However, treatment with Chia seeds extract (CSE) improved sperm quality, which can be attributed to the enhancement of testicular histology and increased testosterone concentration. Chia seeds extract serves as a scavenger for oxygen-derived free radicals, thereby protecting the testis from damage
(Altwaijry et al., 2020). Consequently, CSE treatment may reduce genotoxicity and decrease sperm abnormalities.
These findings are similar to the study by
Kanter et al., (2013), which reported that Chia seeds extract supplementation protects against testicular damage in diabetic rats and reduces the presence of apoptotic cells compared to a group of diabetic rats. Therefore, Chia seeds extractcan be recommended as a dietary spice and a supplement for patients undergoing thyroidectomy to improve their reproductive health.