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Collecting antibodies and large molecule biomarkers in mouse interstitial brain fluid: MS vs cOFM

In the latest issue of the Journal MABS, Florie Le Prieult and colleagues from AbbVie Germany published latest results they observed after measuring concentrations of a monoclonal anitbody - trastuzumab - in the interstitial brain fluid (ISF) of awake and freely moving mice. The only currently available methods for extracting ISF, are Microdialysis (MD) and cerebral open flow microperfusion (cOFM).

mAbs - An open access journal publishing antibody research on topics including targets relevant to cancer and immune-mediated disorders, and antibody therapeutics.

For the first time, both methods were compared at a technical and performance level for the collection of large molecules in rodents. They found 10-fold higher absolute concentrations in cOFM samples compared to MD. In vivo recovery revealed an increased extraction of trastuzumab at low flow rates and a 6-fold higher absolute concentration at steady state than initially calculated with the in vitro recovery.

The authors conclude that the “standardization of these complex methods makes the unraveling of ISF concentrations attainable for various diseases and modalities, starting in this study with mAbs, but extending further in the future to RNA therapeutics, antibody-drug conjugates, and even cell therapies.”

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