Collagen and Elastin Structural Protein Autofluorescence

Symptom

Strong broad-spectrum autofluorescence in collagen and elastin-rich tissues including skin, lung, vessel walls, and fibrotic tissue. Emission persists through fixation and processing.

1. 1 High content of structural proteins (collagen and elastin)
2. 2 Broad excitation and emission spectra of these proteins
3. 3 Fibrotic tissue remodeling
4. 4 Background persists through standard fixation and processing

1. 1 Favor far-red or near-IR fluorophores for target detection
2. 2 Reserve blue and green channels only for very bright or high-density targets
3. 3 Apply Sudan Black B (0.05-0.3% in 70% EtOH, ~10 min) for broad background reduction
4. 4 Test cupric sulfate (1-10 mM in 50 mM ammonium acetate buffer pH ~5, 10-30 min)
5. 5 Use spectral imaging and unmixing when available

Related Video (2)

Current Protocols ★ 82

Deciding on an Approach for Mitigating Autofluorescence

"Directly addresses autofluorescence mitigation strategies, the core problem in this failure case"

Current Protocols ★ 78

Heterogeneous Autofluorescence

"Specifically covers heterogeneous autofluorescence as a technical challenge in fluorescence imaging"