Thapsigargin induces microglial transformation from amoeboid to ramified type in vitro

Area of Science:

• Neuroscience
• Cell Biology
• Immunology

Background:

• Microglia, the resident immune cells of the central nervous system, typically exhibit an amoeboid morphology in standard cell culture conditions.
• Understanding microglial morphology is crucial for studying their function in various neurological conditions.

Purpose of the Study:

• To investigate the effect of thapsigargin (TG) on the morphological transformation of cultured rat cerebral cortex microglia.
• To determine if TG treatment can induce a shift from amoeboid to process-bearing (ramified) microglia in vitro.

Main Methods:

• Cultured microglia from rat cerebral cortex were treated with thapsigargin (TG), a selective endoplasmic reticulum Ca2+-ATPase inhibitor.
• Further enhancement of microglial transformation was achieved using serum-free (N2) medium combined with TG (TG/N2 treatment).
• Phagocytosis activity and expression of microglial activation markers (MRF-1, F4/80) were assessed.

Main Results:

• Thapsigargin treatment induced a morphological transformation of amoeboid microglia into process-bearing (ramified) microglia.
• TG/N2 treatment significantly enhanced this morphological shift.
• TG/N2-treated microglia displayed reduced phagocytic activity and down-regulated expression of MRF-1 and F4/80 markers.

Conclusions:

• Thapsigargin effectively promotes the ramification of amoeboid microglia in vitro.
• This TG-induced transformation provides a valuable method for characterizing ramified microglia under controlled laboratory conditions.
• The study highlights a novel approach to manipulate microglial morphology for research purposes.