Protocols for using substance P and bradykinin as neuropeptide reporter substrates to measure serum protease activity have been adapted for capillary blood and dried blood card samples.
Finger-prick compatibleNeuropeptide protease assays adapted from venous blood to capillary blood and dried blood cards
What the researchers found
Substance P and bradykinin neuropeptide reporter assays were successfully adapted from serum to capillary blood and dried blood card formats, expanding their utility for inflammation and pain research.
Why it matters
Measuring protease activity is important for inflammation and pain research. Using finger-prick blood and dried blood cards instead of venous blood draws makes sample collection easier, especially in clinical settings or remote locations.
The numbers in context
2 neuropeptide reporters; 3 sample types (serum, capillary blood, dried blood cards)
How the study worked
Protocol development adapting existing serum-based neuropeptide protease assays (substance P and bradykinin) for use with capillary blood and dried blood card samples. Comparison with established serum protocols.
Who was studied
Laboratory validation study (no patient population)
What this study cannot tell us
Methods paper — demonstrates protocols without large-scale validation. Sensitivity differences between sample types need characterization. Clinical utility not yet established.
How to read the evidence
Preliminary — protocol development with validation data but not yet clinically validated at scale.
When this study was published
Published in 2020; dried blood card-based assays continue to expand in biomarker research.
The bigger picture
Simplified sample collection methods expand access to protease activity monitoring, potentially enabling point-of-care testing and large-scale epidemiological studies in inflammation and pain research.
Questions still open
- How do protease activity measurements from blood cards compare quantitatively to fresh serum?
- Could this assay be used as a clinical biomarker for inflammatory conditions?
- Can other neuropeptide substrates expand the protease panel measurable from dried blood?
Common questions
Why use neuropeptides to measure protease activity?
What are dried blood cards and why are they useful?
Read the original research
Neuropeptide reporter assay for serum, capillary blood and blood cards.
MethodsX, 7, 100985
Citation
Schreiber, U; Engl, C; Bayer, M; König, S. (2020). Neuropeptide reporter assay for serum, capillary blood and blood cards.. MethodsX, 7, 100985. https://doi.org/10.1016/j.mex.2020.100985