جستجوی مقالات مرتبط با کلیدواژه « bcl-2 » در نشریات گروه « پزشکی »

The B-cell lymphoma 2 (BCL-2) protein is one of the members of the BCL-2 associated X (BAX) protein family that acts as an inducer of apoptosis.

The present study aims to investigate the association between BAX and BCL-2 gene expression with reproductive outcome, in cases undergoing intracytoplasmic sperm injection.

In this case-control study, 50 men were divided into the healthy fertile and oligoasthenoteratozoospermic infertile men (n = 25/each). They were subjected to history taking, clinical examination, and semen analysis. Expression of BAX and BCL-2 genes were measured using real-time polymerase chain reaction. The DNA fragmentation index was measured using the sperm chromatin dispersion assay technique. Using World Health Organization criteria, sperm parameters were evaluated.

Evaluation of apoptosis-related genes showed that oligoasthenoteratozoospermic significantly increased mRNA expression of BAX, and significantly decreased mRNA expression of BCL-2, when compared with control. Moreover, the BAX/BCL-2 ratio was significantly higher in oligoasthenoteratozoospermic compared to the normozoospermic group (p = 0.01). Also, this study showed that the BAX and BCL-2 genes expression had a significant correlation with sperm quality, and DNA fragmentation in the oligoasthenoteratozoospermic group (p = 0.01). The oligoasthenoteratozoospermic men, had a considerably lower proportion of fertilization rate and good-quality embryos at the cleavage stage than the normozoospermic subjects (p = 0.01). A significant correlation was observed between the expression of BAX and BCL-2 genes, fertilization, and embryo quality (p = 0.01).

We concluded that the sperm BAX/BCL-2 ratio demonstrates a significant correlation with fertilization rate and embryo quality.

Endometriosis is a chronic, gynecological disorder, and the disease's pathogenesis is still debatable. Genes related to apoptosis have been revealed to be deregulated in endometriosis.

This study investigates the relationship between polymorphic variants of Bax -248G>A and Bcl-2 -938C>A promoter regions with endometriosis risk in an Iranian population.

In this case-control study, the polymorphisms of Bax -248G>A and Bcl-2 -938C>A promoter regions were analyzed in 127 Iranian cases and 125 controls who were referred to Ali-ibn-Abi Taleb Educational hospital, Zahedan, Iran between May 2022 and February 2023. The genotypic analysis was performed for all the subjects using the polymerase chain reaction-restriction fragment length polymorphism method.

The frequencies of mutant allele A carriers and the A allele of Bax -248G>A polymorphism showed about 2-fold significant increase of endometriosis risk (p = 0.04; p = 0.01, respectively). The frequencies of the mutant genotype AA and A allele carriers of Bcl-2 -938C>A polymorphism were approximately 4 and 2.5-fold higher in endometriosis compared to the control women, which were highly significant (p > 0.001). Moreover, the allele A frequency of Bcl-2 -938C>A was associated with a 2-fold higher risk of endometriosis (p > 0.001). Furthermore, the combination effects of these 2 single nucleotide polymorphisms showed that women with Bax -248G>A GG and Bcl-2 -938C>A AA variant alleles were associated with about 5 times higher risk of endometriosis (p > 0.001). Notably, a significant difference was observed in mutant allele distribution between minimal/mild (stage I and II) and moderate/severe (stage III and IV) women with endometriosis disease.

The results of our study provide evidence that Bcl-2 -938C>A and Bax -248G>A single nucleotide polymorphisms might be associated with the risk of endometriosis.

Cancer is a major cause of death worldwide, second only to cardiovascular disease. Many factors influence the development of cancer, including environmental, genetic, and lifestyle factors. Although the prognosis of colon cancer treatment has improved significantly in recent years, there is still much clinical need to explore new treatment strategies with anticancer and immune-enhancing effects. Phycocyanin (PC) is an important compound isolated from blue-green algae and a well-known antioxidant that suppresses oxidative reactions in cells. It also has other useful functions, such as high efficiency, low toxicity, and antitumor properties. We investigated the potential antiapoptotic effect of PC in vitro on human normal and cancer cell lines.

Phycocyanin extracted from Streptomyces platensis algae has the potential to become a turning point in pharmaceutical research. In this study, PC was used as a natural anticancer agent and apoptosis activator to increase the expression of the PTEN and Bax genes in HT-29 cancer and normal cells (HUVEC). The effect of treatment with PC was evaluated using an MTT assay and flow cytometry.

The results showed that PC can have apoptotic effects on the human colon cancer cell line (HT-29) by up-regulating PTEN and Bax genes and down-regulating AKT and BCL-2 genes.

Based on the findings, PC can be considered a herbal treatment and a useful supplement in the management of human colorectal cancer.

Venetoclax, a specific inhibitor of the BCL2 protein, is administered for the treatment of acute lymphoblastic leukemia. However, despite being utilized in conjunction with chemotherapy, the drug exhibits instances of resistance. The exact mechanisms responsible for this resistance remain relatively obscure. Within the context of this investigation, the study aimed to explore the involvement of anti- and pro-apoptotic proteins as one of the potential mechanisms underlying this resistance phenomenon. Blast cells were extracted from patients diagnosed with B&T acute lymphoid leukemia. Subsequently, these cells were subjected to a cultivation process. Following the cultivation, treatment with the Venetoclax drug was administered to both groups of B&T cells. Additionally, one group from each cell type was designated as a control. The relative expression levels of genes BCL-2, MCL-1, and BIM were assessed in comparison to the control group. Annexin V–fluorescein isothiocyanate and propidium iodide staining was done to check cell apoptosis. The results showed a significant increase in the expression of BIM gene and a significant decrease in BCL-2 gene compared to the control group, but the change in the expression of MCL-1 gene was not significant. Also, an increase in apoptosis was observed in the treatment groups compared to the control. Although it was shown that changes in the expression of pro- and anti-apoptotic genes can lead to an increase in cell apoptosis and a decrease in the number of blast cells, more studies are needed to investigate the simultaneous effect of Venetoclax drug with other drugs and also in the form of a clinical trial.

Enhanced cell survival and drug resistance in tumor cells have been linked to the overexpression of antiapoptotic members of the Bcl-2 family proteins, including Bcl-2 and Mcl-1. The aim of this study was to explore the impact of formononetin and dihydroartemisinin combination on the growth and apoptosis of acute myeloid leukemia (AML) cells.

In this experimental study, the cell survival and cell proliferation were tested by MTT assay and trypan blue staining. The evaluation of cell apoptosis was conducted using Hoechst 33342 staining and a colorimetric assay to measure caspase-3 activity. To determine the mRNA levels of Mcl-1, Bcl-2, Bax, and Cyclin D1, a quantitative real-time polymerase chain reaction (qRT-PCR) was performed.

We showed that treatment with either formononetin or dihydroartemisinin alone, led to significant decrease in the cell survival and growth, and triggered apoptosis in U937 and KG-1 AML cell lines. Moreover, treatment with each of the compounds alone significantly decreased the mRNA levels of Mcl-1, Bcl-2 and Cyclin D1 mRNA, while, the expression level of Bax mRNA was enhanced. Combination of two compounds showed a synergistic anti-cancer effect.

The anti-leukemic potential of formononetin and dihydroartemisinin is exerted through the effect on cell cycle progression and intrinsic pathway of apoptosis. Therefore, they can be considered as a potential anti-leukemic agent alone or along with existing chemotherapeutic drugs.

Testicular torsion is very common in urological emergencies, which damages testicular tissue and reproductive function. Safranal, known for its robust antioxidant properties, has demonstrated effective inhibition of ischemia/reperfusion injury (IRI) in various tissues such as the hippocampus, cerebral, and skeletal muscles. Therefore, this study aimed to evaluate the effect of Safranal on testicular tissue following IRI.

This research involved 48 male adult Wistar rats. They were randomly divided into six groups: control, testicular torsion/detorsion (TD), torsion and detorsion/safranal (0.1, 0.5 mg/kg, ip), and safranal control groups (0.1, 0.5 mg/kg, ip). Under anesthesia, the left testicular torsion was induced for four hours, 30 minutes before detorsion, a single dose of safranal was injected. After 24 hours of reperfusion, assessments encompassing oxidative markers, estradiol, testosterone, LH hormone, sperm parameters, testicular histopathology, and gene expression were conducted on blood and tissue samples.

Heightened seminiferous epithelia (HE) was observed in the TD groups receiving safranal (TD+Sa 0.1, 0.5). There was a significant increase in sperm count and a notable reduction in abnormal sperm count compared to the TD group. Also, the expression of the Bax gene significantly decreased in comparison to the TD group. In rats receiving 0.1 mg/ kg of safranal, there was an improvement in superoxide dismutase (SOD) and glutathione peroxidase (GPx). Although not statistically significant, the TD+Sa groups exhibited slightly enhanced levels of estradiol, testosterone, and LH compared to the TD group.

These findings suggest that safranal may protect testicular tissue from IRI through antioxidant and antiapoptotic pathways.

 Silibinin, an herbal polyphenolic flavonolignan, has antioxidant and anticancer properties.

 This study aimed to evaluate some cellular and molecular effects of silibinin on the human ovarian cancer SKOV-3 cell line.

 For cytotoxicity investigations of silibinin, MTT assay was used at 24, 48, and 72 hours. Apoptosis and cell cycle were studied by flow cytometry. The effect of silibinin on mRNA expression of B-cell lymphoma 2 (Bcl-2), cyclin E, and S-phase kinase-associated protein 2 (SKP2) was determined by Quantitative reverse transcription polymerase chain reaction (QRT-PCR).

 Silibinin administration in lower concentrations (12.5 and 25 µg/mL) did not lead to significant (P < 0.05) changes in cell viability and even slightly increased cell growth after 72 hours. However, silibinin in higher concentrations (≥ 50µg/mL) inhibited SKOV-3 cell proliferation in a dose- and time-dependent manner. The mode of cell growth inhibition was apoptosis induction and G2/M cell cycle arrest. Silibinin caused down-regulation of the anti-apoptotic gene, namely Bcl-2. Additionally, silibinin resulted in down-regulation of the major genes in the cell cycle, including cyclin E and SKP2.

 Overall, this study confirmed the ability of silibinin to suppress ovarian cancer progression through the induction of apoptosis and inhibition of G2/M phase transition. Silibinin may be considered an efficient and safe herbal medication for ovarian cancer.

In addition to oxidative stress, the apoptosis of liver cells plays a main role in non-alcoholic steatohepatitis pathogenesis. Nevertheless, the main mechanisms of the response of liver cell apoptosis in non-alcoholic steatohepatitis (NASH) models caused by a high-fat diet, as well as the effects of exercise with and without calorie restriction on these mechanisms, have not been assessed to date.

The present study aimed to investigate the effects of two exercise protocols with and without calorie restriction on apoptosis and liver damage in rats with non-alcoholic fatty liver disease (NAFLD).

Sixty-four male Wistar rats were subjected to a high-fat diet for eight weeks and were divided randomly into eight groups: Control, calorie restriction (CR), aerobic exercise (AE), and aerobic exercise + calorie restriction (AC) for eight and twelve weeks. Also, two groups of rats that had normal and free access to food werenamedsham groups. The training groups exercised on the treadmill for five sessions a week for eight and twelve weeks. Two-way ANOVA was utilized for data analysis at a significance level of 0.05.

According to the findings, in both 8- and 12-week protocols, the expression of Bax proteins in the exercise and exercise + calorie restriction groups showed a significant decrease compared to the control group (P < 0.05). Also, Bcl-2 protein expression significantly increased in the exerciseandexercise+calorie restriction groups than the controlgroup(P< 0.05). The training groups showed no significant difference between the 8- and 12-week protocols.

It was revealed that exercise with and without caloric restriction and independent of the protocol duration can improve the apoptosis of hepatocytes in NAFLD.

Hyperthermia can cause infertility in men following an increase in testicular temperature. Oxidative stress has been found to be one of its major causes. In the present study, the effects of iron superoxide nanoparticles on the expression of Bcl-2 and Bax family genes were studied.

A total of 48 adult rats were purchased from the Pasteur Institute of Iran. The rats were later divided into 4 groups: control group, control group receiving superoxide nanoparticles (Fe2O3), hyperthermia group, h’:yperthermia group receiving superoxide nanoparticles (Fe2O3). After RNA extraction, evaluating the sperm parameters and the expression of Bax and Bcl-2 genes was examined using RT-PCR technique.

Exposure to iron superoxide nanoparticles (Fe2O3) decreased sperm parameters, increased proapoptotic BAX gene and decreased expression of BCL2 anti-apoptotic gene.

Exposure to nanoparticles by reducing sperm parameters and increasing apoptosis has a negative effect on fertility. The association between infertility and testicular hyperthermia is becoming increasingly apparent; administration of iron superoxide (Fe2O3) nanoparticles can have significant effects on male infertility. Moreover, green synthesis of nanoparticles is also recommended in this field.

The ovarian Ischemia/reperfusion is one of the gynecological emergency concerns that may lead to the ovary damage and folliculogenesis. The present research aimed to evaluate the impact of the Chrysin (CH) on the ischemia-reperfusion (I/R) injury in the rat model.

In this experimental research, 48 adult female rats, 8 weeks age and 180-200 g weight, have been categorized into 6 equal groups (n=8) including one sham and 5 ovarian torsion groups (OT+CH groups) that received different treatments. Each group has been treated 30 min before detorsion with gavage of CH or normal saline for 1 week and pregnant mare serum gonadotropin (PMSG) has been injected on the day 5 for initiating folliculogenesis. Finally, bio-chemical, molecular, histopathological, apoptotic and hormonal evaluations were performed.

The anti-oxidant enzyme, superoxide dismutase and glutathione peroxidase, ameliorated in the ovarian tissues of the OT+CH groups in comparison with the OT group (P<0.001). Moreover, the level of serum Luteinizing hormone considerably declined and estradiol level (P<0.001), partly enhanced in the rats treated with CH in comparison with the ones in the OT group (P<0.05). In addition, histopathological scores of the OT+CH groups ameliorated in comparison with the OT group scores (P<0.05). Furthermore, the expression Caspase-3 and Bax genes were significantly increased while the expression of Bcl-2 was notably decreased in the OT group in comparison with the sham group (P<0.05).

Here, it seems that CH is possibly beneficial for the protection of ovaries against reperfusion injury and ischemia.