Maternal Cells Become Diverse Brain Cells — SkimNews
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- Sami Kanaan and Fred Hutchinson Cancer Center colleagues identified maternal cells in brain tissue from children with epilepsy as neurons, immune cells, blood-vessel cells and astrocytes by analyzing DNA and RNA alongside data from people without epilepsy; the study was published this month but is not yet peer-reviewed.
- Maternal cells in mice appeared to regulate resident immune cells and limit excessive pruning of neuronal connections; mice with fewer showed disrupted communication between the prefrontal cortex and hippocampus and performed worse on tasks recalling previously learned information.
- Fetal cells showed enhanced recruitment in a mouse brain-injury experiment, accompanying reduced brain injury and changes consistent with repair.
- Male DNA was detected in the brains of 37 of 59 women in a 2012 study and was less prevalent among women with Alzheimer’s, but the study did not establish whether fetal cells were protective or whether Alzheimer’s reduced their persistence.
- David Haig said the reason for differences in maternal-cell abundance remains unknown; Kanaan’s samples ranged from about 2.2 to as many as 458.9 cells per 100,000, and he suspected genetic differences in immune recognition and tolerance contribute.
- Pre-eclampsia was flagged because it increases blood-brain barrier permeability, creating a possible route for more fetal cells to enter a mother’s brain; regional sampling can also make a negative sample miss cells present elsewhere.
- David Haig proposed that maternal and offspring interests can diverge: under his hypothesis, fetal cells in a mother’s brain promote care toward that offspring, while maternal cells in a child’s brain favor cooperation toward the mother and siblings; the idea remains unproven.
Why it matters: Human samples ranged from about 2.2 to as many as 458.9 maternal cells per 100,000, revealing wide variation. In mice, lower maternal-cell levels disrupted prefrontal-hippocampus communication and worsened memory recall; for Sami Kanaan and his team, the central distinction to resolve is healthy brain maintenance versus injury response.
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