In the subiculum of Alzheimer's disease model mice, CB1 receptor expression increased in reactive microglia but remained proportionally constant in astrocytes, suggesting distinct glial endocannabinoid responses to amyloid pathology.
Neuroscience researchers, Alzheimer's disease specialists, and those studying endocannabinoid system roles in neurodegeneration.
CB1 receptors increased in reactive microglia near amyloid plaques in Alzheimer's mice
What the researchers found
CB1 receptor expression increased in reactive microglia surrounding amyloid plaques in the subiculum of 5xFAD mice. In astrocytes, CB1 labeling rose proportionally to cell size (reactive astrocytes are larger), keeping receptor density effectively constant.
Why it matters
The endocannabinoid system is involved in neuroinflammation, and understanding how CB1 receptors change in glial cells during Alzheimer's pathology could identify therapeutic targets for modulating the neuroinflammatory response.
The numbers in context
CB1 receptor expression increased in reactive microglia in 5xFAD mice vs. controls. In astrocytes, CB1 labeling increased proportionally to perimeter of reactive astrocytes. Microglial CB1 was found closely surrounding amyloid plaques and dystrophic neurites.
How the study worked
Immuno-electron microscopy examining CB1 receptor localization in microglia and astrocytes in the subiculum of 5xFAD/CB2-EGFP mice (Alzheimer's model) versus controls. Quantitative analysis of receptor density relative to glial cell morphology.
What this study cannot tell us
Mouse model of Alzheimer's disease (5xFAD) overexpresses mutant human genes and may not fully recapitulate human AD pathology. Observational study of receptor expression without functional testing. Only examined the subiculum, one of many affected brain regions.
How to read the evidence
Well-executed electron microscopy study in a transgenic mouse model. Descriptive finding without functional or therapeutic testing.
When this study was published
Published 2023.
The bigger picture
Neuroinflammation driven by microglia and astrocytes is increasingly recognized as a key driver of Alzheimer's progression. The endocannabinoid system modulates this inflammatory response, making it a potential intervention point for slowing disease.
Questions still open
- Does the increase in microglial CB1 expression serve a protective or pathological role? Would CB1 modulation in microglia alter amyloid plaque progression or neuroinflammation?
Common questions
What does this mean for cannabis and Alzheimer's?
What are microglia and why do they matter in Alzheimer's?
Read the original research
Altered glial expression of the cannabinoid 1 receptor in the subiculum of a mouse model of Alzheimer's disease.
Glia, 71(4), 866-879
Citation
Terradillos, Itziar; Bonilla-Del Río, Itziar; Puente, Nagore; Serrano, Maitane; Mimenza, Amaia; Lekunberri, Leire; Anaut-Lusar, Ilazki; Reguero, Leire; Gerrikagoitia, Inmaculada; Ruiz de Martín Esteban, Samuel; Hillard, Cecilia J; Grande, María T; Romero, Julián; Elezgarai, Izaskun; Grandes, Pedro. (2023). Altered glial expression of the cannabinoid 1 receptor in the subiculum of a mouse model of Alzheimer's disease.. Glia, 71(4), 866-879. https://doi.org/10.1002/glia.24312
Explore the wider topic
- How THC Affects Your Amygdala: The Brain's Threat Detector and Cannabis
- The Anandamide Connection: Your Body's Natural Bliss Molecule
- How Long for Cannabinoid Receptors to Return to Normal
- Cannabis and the Developing Brain: What Every Teenager (and Parent) Should Know
- Why Can't I Enjoy Anything Without Weed? The Science Behind It
- Dopamine Recovery After Quitting Weed: What the Science Says
- The Endocannabinoid System Explained Simply: What It Does and Why It Matters
- Your Endocannabinoid System Explained: Why Withdrawal Happens
- Your Nervous System After Quitting Weed: Fight or Flight
- Using Weed Under 18: What It Does to Your Developing Brain
- What THC Does to Your Brain: Why Withdrawal Happens
- THC and Your Prefrontal Cortex: What Cannabis Does to Your Decision-Making Brain
- Weed, Cortisol, and Stress: What Cannabis Does to Your Stress Hormones
- Weed and Memory: What the Science Says About THC and Your Hippocampus
- Weed and Motivation: Is Amotivational Syndrome Real?
- Weed and Your Nervous System: What THC Actually Does to Your Brain and Body
- How Weed Rewires Your Reward System (And How to Reset It)