Aging and Brain Research

In laboratories this year, scientists achieved something that once belonged entirely to science fiction: the creation of human blood stem cells in the lab - the master cells capable of rebuilding the body’s blood and immune systems.  This fascinating breakthrough builds on a landmark 2024 study and pther earlier studies.  Scientists have been "growing" blood cells in labs for years. However, the reason the Australian team (led by Professors Andrew Elefanty and Ed Stanley) is calling this a landmark 2026 achievement is because they finally solved the "functional equivalence" problem.  The MCRI team successfully created hematopoietic stem cells (HSCs) that are functionally identical to those in a human embryo. Crucially, they proved these cells could successfully engraft and reconstitute a blood system in preclinical models. This was the "holy grail" that had eluded researchers for 25 years.  At first glance, it sounds like another medical milestone. B...

New study demonstrated an association between individual immune cell subsets and mortality in a nationally representative sample of older adults (> 55 years) in the United States. Adaptive immune subsets (total T cells), innate subsets (NK cells (CD56LO) and neutrophils) were associated with 4-year mortality even after adjustment for biological age and chronic subclinical inflammation. An increase in the percentage of total T cells, certain CD4+ T cells (called Tn), and a specific subset of natural killer cells (NK LO) was linked to a reduced risk of death. Another type of immune cell subset (DC-M) showed a potential decrease in mortality risk, but this finding wasn't statistically significant. On the other hand, an increase in CD4+ Tem cells, IgD- Mem B cells, and neutrophils was associated with an increased risk of death. After adjusting for multiple comparisons, the associations that remained statistically significant were total T cells, NK LO cells, and neutrophils. NK LO ce...