Interaction of cellular proteins with BCL-xL targeted to cytoplasmic inclusion bodies in adenovirus infected cells

Vitamin E Mitigates Apoptosis in Ovarian Granulosa Cells by Inhibiting Zearalenone-Induced Activation of the PERK/eIF-2α/ATF4/Chop Signaling Pathway

A study aimed to investigate the signaling pathway of zearalenone (ZEA) leading to the apoptosis of ovarian granulosa cells (GCs) and explore the potential of vitamin E (VE) in alleviating ZEA-induced apoptosis of GCs. We constructed an apoptosis model for GCs based on exposure to the environmental toxin ZEA. Transcriptome analysis revealed that ZEA induced endoplasmic reticulum stress by activating the ATF4-Chop pathway. The addition of inhibitors targeting the estrogen receptor (ER) demonstrated that ZEA activates the ATF4-Chop pathway through ER-beta. As a strong antioxidant, VE is thought to mitigate ZEA-induced toxicity. Interestingly, molecular docking analysis at the PERK active site of the endoplasmic reticulum stress revealed a high binding capacity of VE. VE supplementation reduced apoptosis in GCs and decreased the expression of p-eIF-2α, ATF4, and Chop. Mouse tests also demonstrated that VE supplementation effectively mitigated ovarian dysfunction induced by ZEA, as evidenced by increased body weight gain, reduced oxidative stress, and decreased cell death. In summary, the present study demonstrates that ZEA activates the PERK-eIF-2α-ATF4-Chop pathway through ERβ, leading to endoplasmic reticulum stress and apoptosis of GCs. Conversely, VE inhibits the PERK/eIF-2α/ATF4/Chop signaling pathways, mitigating endoplasmic reticulum stress and improving ZEA-induced reproductive toxicity.

Genistein promotes ionizing radiation-induced cell death by reducing cytoplasmic Bcl-xL levels in non-small cell lung cancer

Genistein (GEN) has been previously reported to enhance the radiosensitivity of cancer cells; however, the detailed mechanisms remain unclear. Here, we report that GEN treatment inhibits the cytoplasmic distribution of Bcl-xL and increases nuclear Bcl-xL in non-small cell lung cancer (NSCLC). Interestingly, our in vitro data show that ionizing radiation IR treatment significantly increases IR-induced DNA damage and apoptosis in a low cytoplasmic Bcl-xL NSCLC cell line compared to that of high cytoplasmic Bcl-xL cell lines. In addition, clinical data also show that the level of cytoplasmic Bcl-xL was negatively associated with radiosensitivity in NSCLC. Furthermore, we demonstrated that GEN treatment enhanced the radiosensitivity of NSCLC cells partially due to increases in Beclin-1-mediated autophagy by promoting the dissociation of Bcl-xL and Beclin-1. Taken together, these findings suggest that GEN can significantly enhance radiosensitivity by increasing apoptosis and autophagy due to inhibition of cytoplasmic Bcl-xL distribution and the interaction of Bcl-xL and Beclin-1 in NSCLC cells, respectively.

Antiviral Properties of Chemical Inhibitors of Cellular Anti-Apoptotic Bcl-2 Proteins

Viral diseases remain serious threats to public health because of the shortage of effective means of control. To combat the surge of viral diseases, new treatments are urgently needed. Here we show that small-molecules, which inhibit cellular anti-apoptotic Bcl-2 proteins (Bcl-2i), induced the premature death of cells infected with different RNA or DNA viruses, whereas, at the same concentrations, no toxicity was observed in mock-infected cells. Moreover, these compounds limited viral replication and spread. Surprisingly, Bcl-2i also induced the premature apoptosis of cells transfected with viral RNA or plasmid DNA but not of mock-transfected cells. These results suggest that Bcl-2i sensitizes cells containing foreign RNA or DNA to apoptosis. A comparison of the toxicity, antiviral activity, and side effects of six Bcl-2i allowed us to select A-1155463 as an antiviral lead candidate. Thus, our results pave the way for the further development of Bcl-2i for the prevention and treatment of viral diseases.

Influenza Virus Infection, Interferon Response, Viral Counter-Response, and Apoptosis

Human influenza A viruses (IAVs) cause global pandemics and epidemics, which remain serious threats to public health because of the shortage of effective means of control. To combat the surge of viral outbreaks, new treatments are urgently needed. Developing new virus control modalities requires better understanding of virus-host interactions. Here, we describe how IAV infection triggers cellular apoptosis and how this process can be exploited towards the development of new therapeutics, which might be more effective than the currently available anti-influenza drugs.