How can I reduce background haze in immunofluorescence without damaging epitopes?

[SofiaMM]

I've been trying to map the expression of a specific protein in my tissue samples, but my immunofluorescence results keep coming out with this faint, non-specific background haze that's making quantification impossible. I'm worried my antigen retrieval protocol might be damaging the epitopes, but when I skip that step, I get no signal at all.

[William54]

I have been there. The hazy background shifts when I tweak blocking or washing but then the specific signal drops. It is a tight balance and I worry the retrieval is erasing the epitopes if I push it too far.

[AaronT]

Autofluorescence from the tissue or the fixative often feels like the real culprit. I ran a no primary control and still saw glow which made me suspect the tissue itself.

[Madison_T]

Sometimes the antibody pair is the problem. I have had moments where swapping the secondary reduced the background a bit but not consistently. It is easy to blame the protocol and miss cross reactivity.

[Elizabeth.M]

Do you have a positive control that should light up with the same protocol?