Pulsed and Discontinuous Electromagnetic Field Exposure Decreases Temozolomide Resistance in Glioblastoma by Modulating the Expression of O6-Methylguanine-DNA Methyltransferase, Cyclin-D1, and p53

Pulsed electromagnetic fields inhibit IL-37 to alleviate CD8+ T cell dysfunction and suppress cervical cancer progression

Pulsed electromagnetic field (PEMF) therapy is a potential non-invasive treatment to modulate immune responses and inhibit tumor growth. Cervical cancer (CC) is influenced by IL-37-mediated immune regulation, making PEMF therapy a potential strategy to impede CC progression. This study aimed to elucidate the effects of PEMF on IL-37 regulation and its molecular mechanisms in CC. CC cell-xenografted mouse models, including IL-37 transgenic (IL-37tg) mice, were used to assess tumor growth through in vivo fluorescence imaging and analyze CC cell apoptosis via flow cytometry. TCGA-CESC transcriptome and clinical data were analyzed to identify key inflammation and immune-related genes. CD8+ T cell models were stimulated with PEMF, and apoptosis, oxidative stress, and inflammatory factor expression were analyzed through RT-qPCR, Western blot, and flow cytometry. PEMF treatment significantly inhibited IL-37 expression (p < 0.05), promoted inflammatory factor release (TNF-α and IL-6), and activated oxidative stress, leading to increased CC cell apoptosis (p < 0.05). IL-37 interaction with SMAD3 impacted the p38/NF-κB signaling pathway, modulating CD8+ T cell activity and cytotoxicity. Co-culture of Hela cells with CD8+ T cells under PEMF treatment showed reduced proliferation (by 40%), migration, and invasion (p < 0.05). In vivo experiments with CC-bearing mice demonstrated that PEMF treatment downregulated IL-37 expression (p < 0.05), enhanced CD8+ T cell function, and inhibited tumor growth (p < 0.05). These molecular mechanisms were validated through RT-qPCR, Western blot, and immunohistochemistry. Thus, PEMF therapy inhibits CC progression by downregulating IL-37 and improving CD8+ T cell function via the SMAD3/p38/NF-κB signaling pathway.

Exposure to Low-Frequency Radiation Changes the Expression of Nestin, VEGF, BCRP and Apoptosis Markers During Glioma Treatment Strategy: An In Vitro Study

BACKGROUND

Exposure to physical contamination during chemotherapy, including non-ionizing electromagnetic fields, raises concerns about the widespread sources of exposure to this type of radiation. Glioblastoma multiforme (GBM) is an aggressive central nervous system tumor that is hard to treat due to resistance to drugs such as temozolomide (TMZ).

OBJECTIVE

Electromagnetic fields (EMF) and haloperidol (HLP) may have anticancer effects. In this study, we investigated the effects of TMZ, HLP, and EMF on GBM cell lines and analyzed the association between non-ionizing radiation and the risk of change in drug performance.

METHODS

Cell viability and reactive oxygen species (ROS) generation were measured by MTT and NBT assay, respectively. Then, the expression levels of breast cancer-resistant protein (BCRP), Bax, Bcl2, Nestin, vascular endothelial growth factor (VEGF) genes, and P53, Bax, and Bcl2 Proteins were evaluated by real-time PCR and western blot.

RESULTS

Co-treatment of GBM cells by HLP and TMZ enhanced apoptosis in T-98G and A172 cells by increasing the expression of P53 and Bax and decreasing Bcl-2. Interestingly, exposure of GBM cells to EMF decreased apoptosis in the TMZ+HLP group.

CONCLUSION

In conclusion, EMF reduced the synergistic effect of TMZ and HLP. This hypothesis that patients who are treated for brain tumors and suffer from depression should not be exposed to EMF is proposed in the present study. There appears to be an urgent need to reconsider exposure limits for low-frequency magnetic fields, based on experimental and epidemiological research, the relationship between exposure to non-ionizing radiation and adverse human health effects.

Impact of ketamine administration on chronic unpredictable stress-induced rat model of depression during extremely low-frequency electromagnetic field exposure: Behavioral, histological and molecular study

OBJECTIVES

In the study, we examined the effects of ketamine and extremely low-frequency electromagnetic fields (ELF-EMF) on depression-like behavior, learning and memory, expression of GFAP, caspase-3, p53, BDNF, and NMDA receptor in animals subjected to chronic unpredictable stress (CUS).

METHODS

After applying 21 days of chronic unpredictable stress, male rats received intraperitoneal (IP) of ketamine (5 mg/kg) and then were exposed to ELF-EMF (10-Hz, 10-mT exposure conditions) for 3 days (3 h per day) and behavioral assessments were performed 24 h after the treatments. Instantly after the last behavioral test, the brain was extracted for Nissl staining, immunohistochemistry, and real-time PCR analyses. Immunohistochemistry (IHC) was conducted to assess the effect of ketamine and ELF-EMF on the expression of astrocyte marker (glial fibrillary acidic protein, GFAP) in the CA1 area of the hippocampus and medial prefrontal cortex (mPFC). Also, real-time PCR analyses were used to investigate the impacts of the combination of ketamine and ELF-EMF on the expression of caspase3, p53, BDNF, and NMDA receptors in the hippocampus in rats submitted to the CUS procedure. Results were considered statistically significant when p < .05.

RESULTS

Our results revealed that the combination of ketamine and ELF-EMF increased depression-like behavior, increased degenerated neurons and decreased the number of GFAP (+) cells in the CA1 area and mPFC, incremented the expression of caspase-3, and reduced the expression of BDNF in the hippocampus but showed no effect on the expression of p53 and NMDA-R.

CONCLUSIONS

These results reveal that combining ketamine and ELF-EMF has adverse effects on animals under chronic unpredictable stress (CUS).

Pathological impact and medical applications of electromagnetic field on melanoma: A focused review

Electromagnetic Field (EMF) influences melanoma in various ways. EMF can be classified into extremely low-frequency electromagnetic field, low-frequency magnetic field, static moderate magnetic field, strong electromagnetic field, alternating magnetic field, and magnetic nanoparticles. Each type of EMF influences melanoma development differently, and the detailed influence of each specific type of EMF on melanoma is reviewed. Furthermore, EMF influences melanoma cell polarity and hence affects drug uptake. In this review, the impacts of EMF on the effectiveness of drugs used to treat melanoma are listed according to drug types, with detailed effects according to the types of EMF and specific melanoma cell lines. EMF also impacts clinical therapies of melanoma, including localized magnetic hyperthermia, focalized thermotherapy, proton radiation treatment, nanostructure heating magnetic hyperthermia, radiation therapy, Polycaprolactone-Fe₃O₄ fiber mat-based bandage, and optune therapy. Above all, EMF has huge potential in melanoma treatment.

30 Hz, Could It Be Part of a Window Frequency for Cellular Response?

Many exogenous and endogenous risk factors have been proposed as precursors of brain tumors, including the exposure to non-ionizing electromagnetic fields. Nevertheless, there is still a debate among the scientific community about the hazard of the effects produced by non-ionizing radiation (NIR) because conflicting results have been found (number of articles reviewed >50). For that reason, to provide new evidence on the possible effects produced by exposure to NIR, we performed different studies with several combinations of extremely low frequencies, times, and field intensities in tumoral and non-tumoral cells. The results of our studies showed that cell viability was frequency dependent in glioblastoma cells. In fact, our results revealed that a frequency of 30 Hz-or even other frequencies close to 30 Hz-could constitute a window frequency determinant of the cellular response in tumoral and non-tumoral cells.