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OBJECTIVE: To investigate the prevalence of parasitic infections in the human population and identify the related risk factors of Gonabad city, southeast of Khorasan Razavi province, northeastern Iran. METHODOLOGY: This cross-sectional study was performed from March to April 2019 in Gonabad city in Khorasan Razavi province in northeastern Iran. One thousand thirty-eight stool samples were examined using parasitological methods like direct wet-mounting, formalin-ether concentration and Gomori's trichrome staining. Moreover, the socio-demographic data of inhabitants were recorded. All statistical analyses were performed using SPSS software (version 16). Qualitative variables were reported as numbers and percentages. RESULTS: The overall intestinal parasitic infection prevalence was 18.1 %, whereas this value for protozoan agents was 16.7% (95% CI 14.14 to 19) and 1.3% (95% CI 0.7 to 2) for helminth parasites. The highest parasitic agent prevalence belongs to Blastocystis sp (12.4 %), Entamoeba coli (1.8%) and Enterobius vermicularis (1.2%), respectively. Giardia lamblia (1.1%) Entamoeba histolytica/dispar (0.3%), Iodamoeba butschlii (0.3%), Chilomastix mesnili (0.3%), Hymenolepis nana (0.2 %) Dientamoeba fragilis (0.2%) and Trichomonas hominis (0.3%) were other identified parasites. Multivariate logistic regression analysis revealed a significant association of parasitic intestinal infections with factors such as age, residency status and source of drinking water (P<0.05). CONCLUSION: Our findings approved that the protozoan agents have a relatively high prevalence among the studied population. So, it could be severe enough to alarm the entities implementing healthcare services measures for parasitic intestinal infection control. [ABSTRACT FROM AUTHOR]

Background: The presence of aflatoxin M1, a toxic, mutagenic, and carcinogenic substance, poses significant health risks. Hence, this study assesses the levels of aflatoxin M1 in raw, pasteurized, and sterilized milk obtained from the North Khorasan Province, Iran, and evaluates its potential impact on consumer health. Methods: This descriptive-analytical study randomly collected 189 raw milk samples. Additionally, 70 pasteurized and sterilized milk samples from supermarkets in the North Khorasan Province, Iran, were included. All samples were assessed for aflatoxin M1 contamination using the enzyme-linked immunosorbent assay method. Meanwhile, statistical analysis (analysis of variance) was performed on the results. Results: The Mean±SD concentration of aflatoxin M1 in raw milk from the North Khorasan Province, Iran, was 18.44±34.6 ng/L, while pasteurized and sterilized milk had a higher mean concentration of 42.8±21.54 ng/L. The lowest concentration was found in Bojnord City, Iran, at 9.30±8.91 ng/L, while the highest concentration was detected in Jajarm at 30.70±80.50 ng/L. The mean contamination of aflatoxin M1 was not statistically significant (P=0.42) in most cities of the province. Meanwhile, 6.34% of raw milk and 11.4% of pasteurized milk samples had higher levels of aflatoxin M1 than the maximum limit recommended by the Iran National Standard Organization (INSO) (100 ng/L). However, none of the milk samples exceeded the permissible limit set by the Veterinary Organization of the country (500 ng/L). Conclusion: The mean concentration of aflatoxin M1 in raw and pasteurized milk from the North Khorasan Province is lower than the European Union (EU) standard of 50 ng/L and the approved limit set by the country’s Veterinary Organization (500 ng/L). Therefore, it is not considered a significant threat to the health of adults. [ABSTRACT FROM AUTHOR]

Objective(s): It is worthwhile to note that, some probiotics such as Lactobacilli and Bifidobacteria isolated from dairy products have significant therapeutic effects against cancer cells. Here, we evaluated anti-proliferation and the apoptotic effects of isolated Lactobacillus fermentum Ab.RS22 from traditional dairy products on the HeLa cervical cancer cells in vitro. Materials and Methods: The viability of treated HeLa cells with supernatant of Lactobacillus in 0.5, 0.75, 1, 1.5, and 2 ng/ml concentrations, and IC50 values were detected by tetrazolium bromide. The L. fermentum Ab.RS22-induced cell death by flow cytometry was confirmed through evaluation of the expression of caspase-3, P53, PTEN, and AKT genes by quantitative reverse transcriptionpolymerase chain reactions (qRT-PCR). Results: Most cytotoxicity effects of Lactobacillus on HeLa cells were detected in 2 ng/ml at 24 hr (P<0.01); also, the IC50 value was measured as 1.5 ng/ml. The findings of the flow cytometry assay showed that L. fermentum Ab.RS22 in 1.5 ng/ml concentration at 24 hr increased the percentage of both apoptosis and necrosis cells. Lactobacillus-induced cell death was verified through results of Real-time PCR; where expression of caspase-3, P53, and PTEN genes was increased (P<0.01), and also expression of AKT gene (anti-apoptotic) was decreased (P<0.05). Conclusion: Our findings showed that L. fermentum Ab.RS22 could dose-dependently inhibit the proliferation of the HeLa cells. Its apoptotic effect was confirmed via modulating PTEN/p53/Akt gene expression and activation of the caspase-3 mediated apoptosis pathway. Therefore, L. fermentum Ab.RS22 can be considered a valuable anticancer candidate against cervical cancer progression in subsequent studies. [ABSTRACT FROM AUTHOR]

Paratuberculosis (Johne's disease) is a chronic granulomatous small intestine disease caused by MAP. Diagnosing and isolating infected animals is the most important measure for controlling the disease. Therefore, this study aimed to molecularly identify mycobacterium isolated from ELISA- positive cows with Johne's disease by nested PCR from the samples from Markazi Province, Iran. For this purpose, 2938 samples were decontaminated and then cultured on the Herrold egg culture medium containing mycobactin and no mycobactin. After DNA extraction, PCR for 16S rRNA was first performed, followed by nested PCR on positive samples. Of 2938 samples, 87 were positive, and 26 were suspected. All positive isolates were observed in Ziehl-Neelsen staining in microscopic expansion. A 543-bp band was observed in 26 tested samples and mycobacterium strains in PCR for 16S rRNA, indicating the presence of mycobacterium in the above samples. Nested PCR was performed for all isolates and positive and negative control strains. A 398-bp band was obtained in the first stage, and a 298-bp fragment was obtained in the second stage, indicating the presence of MAP in the samples. Accordingly, nested PCR is suggested as a proper method for the quick and definitive diagnosis of disease cases. [ABSTRACT FROM AUTHOR]

Objective(s): Humic acid (HA) and Fulvic acid (FA) are major members of humic substances, which are extracted from organic sources including soil and peat. The pro-apoptotic and anti-melanogenic effects of HA and FA at the cellular and molecular levels in the A375 human melanoma cell line were examined in this study. Materials and Methods: The cytotoxicity effect of HA and FA were evaluated by cell viability assay. Apoptosis and cell cycle were investigated by flow cytometry. Real-time PCR was carried out to measure the expression of BAX, BCL-2, and Tyr genes. Moreover, the changes in nanomechanical properties were determined through atomic force microscopy (AFM). Results: It was found that HA and FA decrease cell viability with an IC50 value of 50 µg/ml (dosedependent) for 14 hr, arrested cells in the G0/G1 phase, and increased the sub-G1 phase (induce apoptosis). Based on the AFM analysis, Young’s modulus and adhesion force values were increased, also ultrastructural characteristics of cells were changed. Results of Real-time PCR revealed that HA and FA lead to a decrease in the expressions of BCL-2 and Tyr genes, and increase the BAX gene expression. Conclusion: These results exhibited that HA and FA possess pro-apoptotic effects through increasing the BAX/ BCL-2 expression in A375 cells. These molecular reports were confirmed by cellular nanomechanical assessments using AFM and flow cytometry. In addition, HA and FA inhibited melanogenesis by decreasing the expression of the Tyr gene. It is worthwhile to note that, HA and FA can be regarded to design new anti-cancer and anti-melanogenesis products. [ABSTRACT FROM AUTHOR]

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