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 ★ 85

Deciding on an Approach for Mitigating Autofluorescence

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

JoVE (Open Access) ★ 78

Measuring Interactions between Fluorescent Probes and Lignin in Plant Sections by sFLIM Based on Native Autofluorescence

"Demonstrates native autofluorescence measurement in lignocellulosic biomass using sFLIM, directly applicable to structural protein autofluorescence quantification"