#t-cell-immunity

#t-cell-immunity

The thymus is a specialized immune organ responsible for maturing T cells, thereby producing a diverse T cell repertoire crucial for mounting an adaptive immune response. The thymus itself decays with age and eventually transforms entirely into adipose tissue through a process known as thymic involution.

Ferroptosis, a major mechanism of non-apoptotic programmed cell death, critically regulates the homeostasis and functionality of peripheral CD4+ and CD8+ T cells. Here we demonstrate that in mouse, resistance of T cells to ferroptosis depends critically on the composition of standard rodent diets, and that dietary effects on ferroptosis have a crucial role in regulation of T cell homeostasis and immune responses.

During viral infection and in the case of cancer, CD4+ helper T-cells release cytokines, or small signaling proteins, that activate and "give permission" to other immune cells to control and clear viral pathogens. In certain viral infections, such as lymphocytic choriomeningitis virus (LCMV), which is spread by infected rodents, CD4+ T-cells differentiate into different subpopulations, including one subset of progenitor CD4+ T-cells that replenish type 1 helper (Th1) and follicular helper (Tfh) T-cells.

Although specific bacterial taxa have been associated with favourable clinical responses to immune checkpoint blockade (ICB) in cancer patients12,13,18,19,20,21,22, the mechanisms by which the intestinal microbiota influences anti-tumour immune responses remain poorly defined. Products of the microbiota, including metabolites23,24,25 and innate receptor ligands26, may reprogramme myeloid cells27, lowering the activation threshold for antigen presentation and thereby facilitating priming and activation of tumour-reactive T cells.

For years, scientists have viewed cancer as a localized glitch in which cells refuse to stop dividing. But a new study suggests that, in certain organs, tumors actively communicate with the brain to trick it into protecting them. Scientists have long known that nerves grow into some tumors and that tumors containing lots of nerves usually lead to a worse prognosis.

As for side effects, the companies reported that little had changed from previous analyses; adverse events were similar between the two groups. The top side effects linked to the vaccine were fatigue, injection site pain, and chills. The results "highlight the potential of a prolonged benefit" of the vaccine combined with Keytruda in patients with high-risk melanoma," Kyle Holen, a senior vice president at Moderna, said. They also "illustrate mRNA's potential in cancer care," he said, noting that the company has eight more Phase 2 and Phase 3 trials going for mRNA vaccines against a variety of other cancers, including lung, bladder, and kidney cancers.

For more than a decade, doctors and researchers have announced that a handful of people around the world have been cured of HIV. Each of these patients has experienced long-term viral control - in some cases for over a decade - without antiretroviral therapy (ART), as AIDSMap notes, though some doctors describe them as being in "remission." While the patients have shown no signs of HIV since stopping ART, at least some uncertainty remains as to whether the virus could eventually rebound in them.

When Lisa Dutton was declared free of breast cancer in 2017, she took a moment to celebrate with family and friends, even though she knew her cancer journey might not be over. As many as one-third of people whose breast tumours are cleared see the disease come back, sometimes decades later. Many other cancers are known to recur in the years following an initial treatment, some at much higher rates.

Eduardo Vilar-Sanchez has spent more than 10 years pursuing a goal that seemed very distant, but which he now sees as a little closer: to develop a preventive vaccine against cancer. The physician and researcher is leading a study that presented the first promising results of a colon cancer vaccine in a small group of patients suffering from a rare disease that makes them 17 times more likely to develop colon cancer than the general population.