astrocyte necklace

FAQ

What do astrocytes do in the brain?

Astrocytes perform multiple critical functions. They regulate extracellular potassium concentration, preventing neurons from firing spontaneously when K+ rises. They express high-affinity glutamate transporters that remove glutamate from the synapse, terminating synaptic transmission. They maintain the blood-brain barrier by making contact with brain endothelial cells. They respond to neuronal activity and modulate synaptic strength, participating in what is now called the tripartite synapse (neuron-neuron-astrocyte). Loss of astrocytic glutamate uptake is a major mechanism of excitotoxicity in ALS, Alzheimer's disease, and ischemic stroke.

Why is the astrocyte star-shaped?

The star-shaped morphology reflects their function. Each astrocyte extends multiple processes (the arms of the star) that make contact with thousands of synapses. A single astrocyte can wrap around synapses, respond to local neuronal activity, and coordinate neuromodulatory effects across large networks. Astrocyte heterogeneity is substantial: morphologically distinct subtypes exist in different brain regions and cell-type layers, each with specialised properties. The branched shape allows intimate contact with the neural tissue they support.

What size is the pendant and what chain comes with it?

925 sterling silver, 29 mm pendant on a 45 cm sterling silver chain (ø 1.8 mm) with a 5 cm extender. Nickel-free and hypoallergenic. Free worldwide DHL Express in 1-5 business days, with all import duties and taxes covered. 30-day “Love It or Return It” returns.

Is there a gold version of the astrocyte?

Yes. The astrocyte is available in 18K gold vermeil at the same 29 mm size and chain length. Silver suits daily lab or clinical wear, while gold tends to suit a milestone in astrocyte research or a major appointment in clinical neurology or neuroscience.