What kind of staining have you to perform of the slices? Are slices from human brain or animal model? If you write more about your experiments and what you need I will try to help you.
It is impossible to help if you do not write more info: what kind of tissue? Frozen, fixed, paraffin embedded? Cut with and at what thickness? What kind of protein? What does it mean "acute"? I need more info to try to suggest you a protocol for your staining.