I need to quantify microglia and astrocytes through immunofluorescence, however I would like to know the best way to quantify, whether fluorescence intensity or manual counting or some other type
I always use fluorescence intensity (using Iba1 or CD11b as markers). Sometimes, upon activation, microglia can get syncitial which makes cell counting difficult.
Quantifying either through immunofluorescence or flow cytometry is the best option. Try labelling the astrocytes and microglia with markers such as GPAP (for astrocytes) and Pro-Fcgr3 (for microglia). Cell counting may also be too confusing due to similar morphologies.
To confirm microglia activation and phagocytosis (IBA-1+CD-68) and astrocyte activation (GFAP). Measuring fluorescence intensity is mostly used for the analysis.