Morphine counteracts the effects of paclitaxel in triple-negative breast cancer cells.

Background & objectives: Several studies have provided evidence that opioids may play a role in cancer recurrence and metastasis. Multiple research data indicate that morphine can act as a proliferative or suppressive agent on tumour cells depending on the applied concentration. Therefore, this study was aimed to investigate whether the presence of clinically relevant concentrations of morphine has any effect on the efficacy of paclitaxel, a widely used chemotherapeutic drug, on the viability and apoptosis of human triple-negative breast cancer cell line. Methods: MDA.MB.231 cells were treated with paclitaxel in the presence or absence of morphine and examined for cell proliferation by the MTT assay. In addition, the effect of morphine on paclitaxel-induced apoptosis was investigated by flow cytometric assay and by the ratio of Bax/Bcl-2 mRNA expression levels with quantitative real-time (qRT)-PCR. Results: Morphine significantly increased the proliferation of breast cancer cells at low concentrations (0.1-2.5 µM) but higher concentrations showed cytotoxic effect. Pre-treatment with 0.1 or 1 µM of morphine decreased the paclitaxel-induced cytotoxicity, the proportion of apoptotic cell, and the ratio of Bax/Bcl-2 mRNA expressions. Interpretation & conclusions: Our data suggest that morphine promotes breast cancer cell viability at clinically relevant plasma concentrations and reduces the apoptotic effect of paclitaxel. This interaction may be very important in clinical settings; however, more studies are needed to explore the plausible mechanisms of interaction and to correlate such findings through in vivo animal studies as well as clinically.

Inhibition of Plasma Membrane Calcium Pump Influences Intracellular Calcium Signaling Pathways in Breast Cancer.

The plasma membrane calcium pump (PMCA) is an important transporter that maintains intracellular calcium concentration ([Ca2+]i). It allows the calcium (Ca2+) from inside the cell to go out of the cell through the plasma membrane. For this, it cooperates with the proteins in the cell. The aim of this study is to demonstrate the effect of PMCA on intracellular calcium signaling in breast cancer cells. In this study, PMCA was inhibited by orthovanadate (OV), and changes in Calmodulin (CaM), Calcineurin (CaN) and cMyc proteins were demonstrated. Intracellular calcium accumulation was measured when PMCA was inhibited in MDA-MB-231 cells. At the same time, it was observed that the cell movement decreased with time. Over time, CaN and CaM were slightly suppressed, and cMyc protein was not expressed. As a result, when PMCA protein is targeted correctly in breast cancer cells, it has an indirect effect on cancer-promoting proteins.

The role of cytokeratin 19 levels in the determination of endometriosis stages.

OBJECTIVE/AIM: Endometrisosis, one of the most common gynecological disease, is characterized by the presence of endometriotic tissue outside of uterine cavity. The development and the validation of a simple blood biomarker specific and sensitive for endometriosis may facilitate the rapid and the accurate diagnosis of the disease and thus early treatment. Cytokeratin expression changes during epithelial differentiation and this expression is important for the modulation and the control of cell cycle regulation, tumor cell motility and apoptosis. Cytokeratin 19 (CK-19) is expressed in most simple epithelial cells and their malignant counterparts. The aim of this study is to investigate serum CK-19 expression levels in patients with endometriosis and to determine the diagnostic role of CK-19 levels in differentiating various stage of endometriosis. METHODS: Ctytokeratin-19 expression and level were studied in 70 endometriosis patients and 50 volunteers by ELISA and RT-PCR. ROC analysis was performed by comparing all stages with each other and with the control group. RESULTS: The CK-19 levels were significantly higher in the endometriosis groups than that of the control group by ELISA and RT-PCR. A significant (p < .05) difference was observed in endometriosis patients according to the stages. CONCLUSION: Based on our data, it suggests that Cytokeratin-19 may have a potential role in the development of endometriosis.

The Effect of Cyclosporine A on Proteins Controlling Intracellular Calcium Concentration in Breast Cancer Cells.

Cyclosporine A (CsA) is an immunosuppressive drug commonly used to prevent autoimmune diseases. At the same time, CsA is a calcineurin (CaN) inhibitor. It affects the intracellular calcium signaling pathway. The effect of CsA on breast cancer cells, MDA-MB-231, plasma membrane calcium pump 1 (PMCA1), calmodulin (CaM), calcineurin (CaN), and cMyc, which are proteins that affect calcium signaling, were investigated. CsA inhibited the proliferation of MDA-MB-231 cells but did not affect the migration of the cells. After 24 h of incubation, CsA suppressed the PMCA1 protein, which pumps intracellular calcium out of the cell. At the same time, calcium started to accumulate inside the cell and CaM protein was expressed, while PMCA1 was suppressed. The CaN protein was suppressed 72 h after the administration of CsA, but the cMyc protein was expressed. Interestingly, 24 h incubation when the PMCA1 protein is down-regulated after the duration of time, the cMyc protein is also down-regulated. Although the indirect effect of CaN and cMyc is known, this relationship between PMCA1 and cMyc was not known. As a result, it has been shown that CsA affects the PMCA pump by disrupting the intracellular calcium pathway in breast cancer cells.

Transgenerational impact of topical steroid application on superoxide dismutase activities of hypothalamus-pituitary-adrenal axis in rats.

Topical steroids (TS) have been widely prescribed since the 1950s. This study investigated for the first time the transgenerational effects of TS on the antioxidant mechanism of the hypothalamus-pituitary-adrenal (HPA) axis, both in prenatal and infancy. Three generations (F1, F2, and F3) and prenatal group (P) were investigated in both sexes with two different time points; P45th and P75th day were accepted as puberty and early adulthood, respectively. Clobetasol propionate 0.05% was used as TS. Quantitative real-time PCR was performed to expressional analyses of Sod1, Sod2, and Sod3 genes in the HPA tissues. The Sod mRNA expression of the HPA belonging to P and F1 groups revealed similar results in both genders. The downregulation in the adrenal Sod level was determined in P and F1, F2, and F3 generations in both genders, especially in females (p < 0.05). The Sod activities in the pituitary of all groups were downregulated in female rats (p < 0.05). Interestingly, in male rats, Sod2 and Sod3 were not expressed in the pituitary compared with the control on the day P45, while Sod2 and Sod3 expressions were determined in all the groups on day P75. Sod1 overexpression was found in pituitary and hypothalamus of males in the F3 generation. This study showed that TS applied in infancy had a transgenerational adverse effect on antioxidant defense mechanisms, especially in the adrenal gland.

The effect of bee bread (Perga) with chemotherapy on MDA-MB-231 cells.

Bee bread (BB) is a bee product like propolis and honey. It is the main food for larvae and bees producing royal jelly in the hive. It also known as Perga. As with other bee products, it is increasingly popular due to its antioxidant properties. The aim of this study was to examine the effects of BB on MDA-MB-231 breast cancer cells and the effects on these cells when administered together with Doxorubicin (DOX) and Cisplatin (CDDP), used in cancer treatment. The proliferation of the cells was determined by applying 5 mg/mL BB together with different concentrations of DOX and CDDP. In addition to these studies, the effect of DOX+BB and CDDP+BB combinations on the migration of MDA-MB-231 cells was determined by the wound healing method. The expression levels of Bid and Bcl-2 were determined by RtqPCR. According to these studies, as expected, BB did not show a significant toxic effect on MDA-MB-231 cells at different concentrations. BB significantly suppressed the effect of DOX and CDDP on the proliferation of MDA-MB-231 cells. BB with DOX and CDDP suppressed the proapoptotic Bid gene while overexpressing the anti-apoptotic Bcl-2 gene, separately. Interestingly, BB blocked the migration of MDA-MB-231 cells by 50% even after 72 h. As a result, BB significantly reduced the toxicity of DOX and CDDP on MDA-MB-231 cells. The most interesting result of the study is that BB prevented the migration of cancer cells.

Encephalitozoon intestinalis Infection Impacts the Expression of Apoptosis-Related Genes in U937 Macrophage Cells.

PURPOSE: Encephalitozoon intestinalis affects many physiological processes of host cells to survive, proliferate, and spread to different regions within the body. In this study, the effects of the parasite on host cell apoptosis and proliferation were investigated. METHODS: To determine the impact of the parasite on the host cell apoptosis, changes in the expression profile of genes were investigated with the qPCR array using the Human Apoptosis Panel in infected and non-infected macrophage cells. Also, the rate of apoptosis in the cells was determined by Giemsa staining method. Cell proliferation was determined by measuring the DNA concentration in infected and non-infected cells. RESULTS: The thirty-six of apoptosis-related genes were down-regulated, while 20 of apoptosis-related genes were up-regulated in infected cells compared to uninfected cells. However, there were no significant changes detected in 32 analyzed genes between infected and control groups. E. intestinalis was determined to decrease cell proliferation in U937 macrophage cells. Unexpectedly, Giemsa staining showed an increase in the rate of apoptosis in infected cells. CONCLUSION: Regulated genes after infection are involved in many different biological pathways and various components of the cell. This suggests that the parasite uses highly sophisticated ways to maintain the viability of the cell.

Prevalence of Microsporidiosis in Different Hosts in Turkey: A Meta-analysis.

OBJECTIVE: Microsporidia are opportunistic obligate intracellular pathogens which infect many vertebrate and invertebrate hosts. This study aimed at investigating all evidence about microsporidia infection in human and other vertebrate hosts in Turkey. METHODS: This study covered all prevalence studies, related to microsporidiosis in Turkey until April 2020, that were found in Web of Science, PubMed, Scopus, and ULAKBIM databases were considered in this meta-analysis. A total of 168 studies were identified in the systematic literature research. After the initial assessment, only 15 articles (12 humans and three other vertebrates) were included for meta-analysis. Data analysis was carried out using the Revman 5.3 (Review Manage 5.3) software. RESULTS: With the evaluation of these studies, it was found that the prevalence of microsporidia in humans (n=6.707) and other vertebrate hosts (n=506) was 13.4% and 15.2%, respectively. The risk ratio in the patient groups was 2.87 compared to the control group [95% confidence interval (CI): 1.20-6.87, I2=87%, p<0.00001]. There was no difference between genders and parasite prevalence (95% CI: 1.00-1.39, I2=18%, p=0.29). The prevalence of microsporidia was also found to be high in patients with diarrhea (95% CI: 1.09-1.58, I2=86%, p=0.0001) and in immunosuppressed individuals (95% CI: 1.86-3.70, I2=16%, p=0.31). CONCLUSION: Although there are few studies on the prevalence of these parasites, the results of this meta-analysis provides extensive information about the current situation in Turkey.