An experimental antibiotic was able to prevent recurrent Clostridioides difficile infections (rCDI) by killing bacterial spores as well as growing spores. Researchers from the University of Notre Dame reported their findings in the Proceedings of the National Academy of Sciences on May 8, 2023.
Blocking signaling through the ectodysplasin A2 receptor (EDA2R), a member of the TNF receptor family, protected tumor-bearing mice from developing muscle atrophy associated with cancer cachexia. Upstream and downstream of EDA2R, “we identified two distinct pathways and we demonstrated their involvement in muscle wasting,” Serkan Kir told BioWorld. Kir is a professor at the Koç University Center for Translational Medicine and corresponding author of the paper reporting the findings, which appeared in Nature on May 10, 2023.
By analyzing a cohort of adolescents that developed myocarditis or pericarditis after vaccination against SARS-CoV-2 vaccination, researchers from Yale University School of Medicine were able to pinpoint the underlying mechanism as an overly active innate immune response to the vaccine that led to broad activation of T cells and natural killer (NK) cells. Myocarditis “has been seen in other vaccine contexts, though is most common after viral infection,” Carrie Lucas told reporters at a press conference announcing the findings.
A method for parallel sequencing of single-cell extrachromosomal circular DNA (ecDNA) and full-length mRNA transcriptomes has enabled new insights into the roles of ecDNA in cancer progression, researchers from Charité hospital and the Max Delbrück Center for Molecular Medicine reported in Nature Genetics on May 8, 2023. Circular DNAs are present in at least a third of cancer cells, and their presence correlates with poor prognosis in many cases. They can carry driver genes that have separated themselves from their chromosome of origin, and some research suggests that they serve as “reserve copies” of driver genes. Boundless Bio Inc. is in phase I trials targeting ecDNAs.
A pill that delivers electrical stimulation to the vagus nerve from inside the stomach was able to trigger the release of appetite-controlling neurohormones, specifically the “hunger hormone” ghrelin. The work, which was described in the April 26, 2023, issue of Science Robotics, could pave the way for treating “metabolic, [gastrointestinal], and neuropsychiatric disorders noninvasively with minimal off-target effects,” the authors wrote in their paper.
A pill that delivers electrical stimulation to the vagus nerve from inside the stomach was able to trigger the release of appetite-controlling neurohormones, specifically the “hunger hormone” ghrelin.
Researchers have identified a druggable pocket on the phosphatase Wip1, which regulates the tumor suppressor TP53 as well as DNA damage repair proteins. The work, which was published in Frontiers in Molecular Biosciences on April 18, 2023, by researchers from the University of Pennsylvania, could lead to therapeutics targeting Wip1. And the computational deep learning methods used to identify the pocket are broadly useful for identifying what the authors call “cryptic” pockets.
Antitumor immunotherapy has notched big wins, but in a small proportion of patients. And one possible explanation for why is that approved immunotherapies are not yet planting their flag on most of the battlefields where tumors and the immune system engage in combat. At the opening AACR 2023 plenary session, Ralph DeNardo celebrated the successes of the current, mostly T-cell-based approaches, but also encouraged his colleagues to think more broadly about the antitumor immunity.
Combining the personalized cancer vaccine mRNA-4157 (V-940, Moderna Inc.) with Keytruda (pembrolizumab, Merck & Co. Inc.) significantly extended recurrence-free survival in patients with stage III/IV resected high-risk melanoma in the randomized phase II KEYNOTE-942/mRNA-4157-P201 trial. Compared to Keytruda alone, adding the vaccine cut the risk of recurrence or death by 44% 18 months after treatment, lead investigator Jeffrey Weber reported at the opening clinical trials plenary of the 2023 annual meeting of the American Association for Cancer Research (AACR).
Heterogeneity, in both tumors and their microenvironment, limits the success of current cancer treatments. But it also provides opportunities. Heterogeneities “are not barriers to therapy, they are vulnerabilities to be exploited,” was how David DeNardo described his take at the 2023 annual meeting of the American Association for Cancer Research (AACR) on Sunday.
