Browsing by Author "Djordjevic, Aleksandra Buha (57216286846)"

Testis cancer (TC) is the most common malignancy of young men. Current evidence from studies, alongside genetics and hormonal status, suggests a significant role of toxic metals, cadmium (Cd) and lead (Pb), in the origin and development of TC. Besides oxidative stress and endocrine disruption, interaction with bioelements is one of the critical mechanisms of Cd and Pb toxicity and malign transformation. This study aimed to investigate metal levels in blood, healthy, and tumor testis tissue and to reveal hormone, oxidative status, and bioelements levels in patients with TC. The study enrolled 52 patients with TC and 61 healthy volunteers. Toxic metals and bioelements levels were analyzed by atomic absorption spectrophotometry (AAS) while electrochemiluminescence immunoassay (ECLIA) and spectrophotometry methods were used for hormone and oxidative parameters evaluation. Significantly higher blood Cd levels were depicted in TC cohort. Furthermore, blood Cd elevation was associated with a 1.98 higher probability of TC developing. However, a metal concentration between healthy and tumor testis tissue did not differ significantly. Lower levels of estradiol and testosterone, established in a cohort of TC patients, followed the significant role of hormones in TC development. At the same time, ischemia-modified albumin (IMA) has been recognized as a parameter with very good accuracy as a potential diagnostic marker for TC. The study revealed different distribution patterns of copper (Cu) and zinc (Zn) in the three compartments of the patients, as well significant correlation between essential metals Cu/Zn and toxic metals Cd/Pb indicating metal-metal interactions as pivotal mechanisms of metals toxicity. © 2023 Elsevier Ltd

Testis cancer (TC) is the most common malignancy of young men. Current evidence from studies, alongside genetics and hormonal status, suggests a significant role of toxic metals, cadmium (Cd) and lead (Pb), in the origin and development of TC. Besides oxidative stress and endocrine disruption, interaction with bioelements is one of the critical mechanisms of Cd and Pb toxicity and malign transformation. This study aimed to investigate metal levels in blood, healthy, and tumor testis tissue and to reveal hormone, oxidative status, and bioelements levels in patients with TC. The study enrolled 52 patients with TC and 61 healthy volunteers. Toxic metals and bioelements levels were analyzed by atomic absorption spectrophotometry (AAS) while electrochemiluminescence immunoassay (ECLIA) and spectrophotometry methods were used for hormone and oxidative parameters evaluation. Significantly higher blood Cd levels were depicted in TC cohort. Furthermore, blood Cd elevation was associated with a 1.98 higher probability of TC developing. However, a metal concentration between healthy and tumor testis tissue did not differ significantly. Lower levels of estradiol and testosterone, established in a cohort of TC patients, followed the significant role of hormones in TC development. At the same time, ischemia-modified albumin (IMA) has been recognized as a parameter with very good accuracy as a potential diagnostic marker for TC. The study revealed different distribution patterns of copper (Cu) and zinc (Zn) in the three compartments of the patients, as well significant correlation between essential metals Cu/Zn and toxic metals Cd/Pb indicating metal-metal interactions as pivotal mechanisms of metals toxicity. © 2023 Elsevier Ltd

Introduction: Nickel (Ni) is one of the well-known toxic metals found in the environment. However, its influence on thyroid function is not explored enough. Hence, the aim of this study was to analyse the potential of Ni to disrupt thyroid function by exploring the relationship between blood Ni concentration and serum hormone levels (TSH, T4, T3, fT4 and fT3), as well as the parameters of thyroid homeostasis (SPINA-GT and SPINA-GD) by using correlation analysis and Benchmark (BMD) concept. Methods: Ni concentration was measured by ICP-MS method, while CLIA was used for serum hormone determination. SPINA Thyr software was used to calculate SPINA-GT and SPINA-GD parameters. BMD analysis was performed by PROAST software (70.1). The limitations of this study are the small sample size and the uneven distribution of healthy and unhealthy subjects, limited confounding factors, as well as the age of the subjects that could have influenced the obtained results. Results and discussion: The highest median value for blood Ni concentration was observed for the male population and amounted 8,278 µg/L. Accordingly, the statistically significant correlation was observed only in the male population, for Ni-fT4 and Ni-SPINA-GT pairs. The existence of a dose-response relationship was established between Ni and all the measured parameters of thyroid functions in entire population and in both sexes. However, the narrowest BMD intervals were obtained only in men, for Ni - SPINA-GT pair (1.36-60.9 µg/L) and Ni - fT3 pair (0.397-66.8 µg/L), indicating that even 78.68 and 83.25% of men in our study might be in 10% higher risk of Ni-induced SPINA-GT and fT3 alterations, respectively. Due to the relationship established between Ni and the SPINA-GT parameter, it can be concluded that Ni has an influence on the secretory function of the thyroid gland in men. Although the further research is required, these findings suggest possible role of Ni in thyroid function disturbances. Copyright © 2023 Maric, Baralic, Javorac, Mandic-Rajcevic, Zarkovic, Antonijevic, Djukic-Cosic, Bulat and Djordjevic.

Endocrine-disrupting chemicals are significant contributors to various detrimental conditions, mechanistically disrupting the endocrine system and causing adverse health effects. Mounting evidence suggests they can induce multigenerational and transgenerational effects, yet awareness among individuals remain insufficient. This study aimed to assess the knowledge, attitudes and ways of informing mothers in Serbia about endocrine disruptors based on information from 190 women in Serbia. The research was conducted using a survey consisting of multiple-choice questions comprising: The first part aimed to collect sociodemographic data, the second part related to knowledge and attitudes about endocrine disruptors, and the third part focused on the sources of information about endocrine disruptors. Cronbach’s alpha was used to check for scale reliability, and Pearson correlation was used to test the relations between interval variables. ANOVA was employed to test for group differences. The results indicated that mothers in Serbia do not have adequate knowledge about endocrine disruptors (potential sources, categories of substances and alternatives) nor confidence in their ability to mitigate exposure to endocrine disruptors. Also, the estimation of the health risks of exposure to endocrine disruptors was perceived as high, and the mothers thought that they should get additional information about endocrine disruptors before pregnancy. Although with several limitations (i.e. mothers were recruited among those with higher education and mainly from urban areas), the study results highlight the necessity for enhanced maternal education in Serbia regarding endocrine disruptors. Health professionals are deemed most suitable for providing this education, given the respondents’ high level of trust in them. © 2025 the author(s)

Endocrine-disrupting chemicals are significant contributors to various detrimental conditions, mechanistically disrupting the endocrine system and causing adverse health effects. Mounting evidence suggests they can induce multigenerational and transgenerational effects, yet awareness among individuals remain insufficient. This study aimed to assess the knowledge, attitudes and ways of informing mothers in Serbia about endocrine disruptors based on information from 190 women in Serbia. The research was conducted using a survey consisting of multiple-choice questions comprising: The first part aimed to collect sociodemographic data, the second part related to knowledge and attitudes about endocrine disruptors, and the third part focused on the sources of information about endocrine disruptors. Cronbach’s alpha was used to check for scale reliability, and Pearson correlation was used to test the relations between interval variables. ANOVA was employed to test for group differences. The results indicated that mothers in Serbia do not have adequate knowledge about endocrine disruptors (potential sources, categories of substances and alternatives) nor confidence in their ability to mitigate exposure to endocrine disruptors. Also, the estimation of the health risks of exposure to endocrine disruptors was perceived as high, and the mothers thought that they should get additional information about endocrine disruptors before pregnancy. Although with several limitations (i.e. mothers were recruited among those with higher education and mainly from urban areas), the study results highlight the necessity for enhanced maternal education in Serbia regarding endocrine disruptors. Health professionals are deemed most suitable for providing this education, given the respondents’ high level of trust in them. © 2025 the author(s)

Background: Cadmium and lead are widespread and non-biodegradable pollutants of great concern to human health. In real life scenarios, we are exposed to mixtures of chemicals rather than single chemicals, and it is therefore of paramount importance to assess their toxicity. In this study, we investigated the toxicity of Cd and Pb alone and as a mixture in an animal model of acute exposure. Methods: Experimental groups received a single treatment of aqueous solution of Cd-chloride (15 and 30 mg/kg body weight (b.w.) and Pb-acetate (150 mg/kg b.w.), while the mixture group received 15 mg Cd/kg b.w. and 150 mg Pb/kg b.w. Toxic effects of individual metals and their mixture were investigated on hematological and biochemical parameters, and the redox status in the plasma, liver, and kidneys of treated Wistar rats. Results: Tissue-specific changes were recorded in various parameters of oxidative damage, while the accumulation of metals in tissues accompanied the disturbances of both hematological and biochemical parameters. It was observed that the level of toxic metals in tissues had a different distribution pattern after mixture and single exposure. Conclusions: Comprehensive observations suggest that exposure to Cd and Pb mixtures produces more pronounced effects compared to the response observed after exposure to single metal solutions. However, further research is needed to confirm toxicokinetic or toxicodynamic interactions between these two toxic metals in the organisms. © 2019 by the authors. Licensee MDPI, Basel, Switzerland.

Background: Cadmium and lead are widespread and non-biodegradable pollutants of great concern to human health. In real life scenarios, we are exposed to mixtures of chemicals rather than single chemicals, and it is therefore of paramount importance to assess their toxicity. In this study, we investigated the toxicity of Cd and Pb alone and as a mixture in an animal model of acute exposure. Methods: Experimental groups received a single treatment of aqueous solution of Cd-chloride (15 and 30 mg/kg body weight (b.w.) and Pb-acetate (150 mg/kg b.w.), while the mixture group received 15 mg Cd/kg b.w. and 150 mg Pb/kg b.w. Toxic effects of individual metals and their mixture were investigated on hematological and biochemical parameters, and the redox status in the plasma, liver, and kidneys of treated Wistar rats. Results: Tissue-specific changes were recorded in various parameters of oxidative damage, while the accumulation of metals in tissues accompanied the disturbances of both hematological and biochemical parameters. It was observed that the level of toxic metals in tissues had a different distribution pattern after mixture and single exposure. Conclusions: Comprehensive observations suggest that exposure to Cd and Pb mixtures produces more pronounced effects compared to the response observed after exposure to single metal solutions. However, further research is needed to confirm toxicokinetic or toxicodynamic interactions between these two toxic metals in the organisms. © 2019 by the authors. Licensee MDPI, Basel, Switzerland.