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    Investigation of the effects of pinealectomy on acetylcholinesterase enzyme activity and oxidative stress in rat brain
    (Springer Japan Kk, 2025) Pekmez, Hidir; Ozkaya, Ahmet; Uckun, Mirac; Zayman, Emrah; Aydin, Merve; Canpolat, Sinan; Gul, Mehmet
    The pineal gland releases melatonin to regulate our body's circadian rhythm based on light and dark cycles. The pinealectomy (PINX) model is an experimental approach employed to investigate the potential impact of melatonin on various tissues and pathologies. In this study, acetylcholinesterase (AChE) enzyme activity levels, oxidative stress parameters, histopathological findings, and serum melatonin levels in rat brain tissue were evaluated following pinealectomy. 24 male Sprague Dawley rats were randomly divided into groups: control, Sham-Pinealectomy (SHAM), and PINX. Brain tissue samples were taken at the end of a 50-day experimental period to determine the parameters of AChE, glutathione s-transferase (GST), carboxylesterase (Ces) enzyme activities, and malondialdehyde (MDA), reduced glutathione (GSH) levels spectrophotometrically. Moreover, serum melatonin levels were measured, and tissues underwent standard histological analysis to determine the histopathological damage score. In this study, we found that the PINX group had decreased AChE and Ces enzyme activity, increased MDA, decreased GSH levels, and no change in GST enzyme activity. A relative decrease in serum melatonin levels was also observed in the PINX group. In the light microscopic examination of the brain tissue of pinealectomy rats, it was observed that the eosinophilic staining intensity increased, heterochromatic/pycnotic-looking neuron nuclei were prominent in the cortex layers and hippocampus, and perineural edematous areas were abundant. Excessive perineuronal edema, cytoplasmic eosinophilia, and heterochromatic/pycnotic nuclei were found based on the histopathological damage score. After pinealectomy, we observed an increase in oxidative stress and a decrease in AChE levels in the brain.
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    Pomegranate Juice Treatment Prevents Carbon Tetrachloride(CCl4)-induced Testicular Damage in Rats: A Biochemical and Histological Study
    (Univ Ljubljana Press, 2025) Kalkan, Omer Faruk; Turk, Ahmet; Citil, Cihan; Uckun, Mirac; Ozkaya, Ahmet; Yologlu, Ertan; Ozay, Yusuf
    We investigated the side effects of carbon tetrachloride (CCl4) on testicular tissue and explored the protective effects of pomegranate juice (PJ) against CCl4 exposure. Twenty-eight male Wistar albino rats were randomly divided into four groups as follows: Control, PJ, CCl4, and CCl4+PJ. We assessed serum testosterone levels and evaluated carboxylesterase (CaE), malondialdehyde (MDA), glutathione (GSH), glutathione reductase (GR) and glutathione Stransferase (GST) parameters. Histopathological changes were examined using CD68 immunoreactivity to detect macrophage activity. Analysis revealed a significant increase in CaE activity in the PJ group that compared to the control group (p < 0.05). CCl4 exposure reduced CaE activity, which was partially restored by PJ in the CCl4+PJ group (p < 0.05). PJ also significantly reduced the elevated MDA levels induced by CCl4 (p < 0.05). CCl4 alone decreased the reduced glutathione (GSH) levels (p < 0.05), however PJ had no effect on GSH levels (p > 0.05). Neither CCl4 nor PJ had an effect on glutathione reductase (GR) and glutathione S-transferase (GST) activity (p > 0.05). In conclusion, PJ reversed histological damage and restored reduced testosterone levels. Furthermore, it alleviated CCl4-induced oxidative stress by utilizing an alternative antioxidant system rather than glutathione.
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    The protective effects of pomegranate juice on lead acetate-induced neurotoxicity in the male rat: A histomorphometric and biochemical study
    (Wiley, 2022) Annac, Ebru; Uckun, Mirac; Ozkaya, Ahmet; Yologlu, Ertan; Pekmez, Hidir; Bulmus, Ozgur; Aydin, Ali
    The purpose of this study was to investigate the potential side-effects of lead acetate (LA), which is toxic to the nerves, blood and muscles, in the rat brain. The neuroprotective effects of pomegranate juice (PJ) against LA exposure were also observed. The experiment involved 28 male Wistar albino rats aged 12 weeks. These were divided into four groups: Control, PJ, LA and LA+PJ. Stereological techniques were employed to determine hippocampal volume in each rat brain. Biochemical investigations and histopathological examinations were also performed. Analysis demonstrated a significant decrease in hippocampal volume in the LA group compared to the control group (p < .05). The stereology results also indicated that PJ has protective effects when compared with the LA and LA+PJ groups. A significant increase was also determined in malondialdehyde (MDA) levels and glutathione S-transferase (GST) activity in the LA group compared to the control group, in contrast to glutathione (GSH) levels and carboxylesterase (CaE) and acetylcholinesterase (AchE) activities. MDA and GST activity decreased significantly in the LA+PJ group compared to the LA group in contrast to GSH levels and CaE and AchE activities. Histopathological examination revealed a number of degenerative changes in the LA group. Exposure to LA adversely affects the hippocampus on the male rat brain. It might also be suggested that PJ may ameliorate these deleterious effects.