02210nas a2200265   4500000000100000000000100001008004100002260001500043653002600058653002500084653003000109653002000139100001800159700001900177700001500196700001800211700001700229700001700246700001600263245008800279856006700367300001200434520148400446022001401930       2024                            d  c2024-06-2710aaccurate drug testing10aanti-fouling coating10alubricant-infused surface10aorgan-on-a-chip1 aTae Young Kim1 aJeong-Won Choi1 aKijun Park1 aSeungHwan Kim1 aJeong F. Kim1 aTae-Eun Park1 aJungmok Seo00aLubricant-Coated Organ-on-a-Chip for Enhanced Precision in Preclinical Drug Testing  uhttps://onlinelibrary.wiley.com/doi/abs/10.1002/smll.202402431  a24024313 aIn drug discovery, human organ-on-a-chip (organ chip) technology has emerged as an essential tool for preclinical testing, offering a realistic representation of human physiology, real-time monitoring, and disease modeling. Polydimethylsiloxane (PDMS) is commonly used in organ chip fabrication owing to its biocompatibility, flexibility, transparency, and ability to replicate features down to the nanoscale. However, the porous nature of PDMS leads to unintended absorption of small molecules, critically affecting the drug response analysis. Addressing this challenge, the precision drug testing organ chip (PreD chip) is introduced, an innovative platform engineered to minimize small molecule absorption while facilitating cell culture. This chip features a PDMS microchannel wall coated with a perfluoropolyether-based lubricant, providing slipperiness and antifouling properties. It also incorporates an ECM–coated semi-porous membrane that supports robust multicellular cultures. The PreD chip demonstrates its outstanding antifouling properties and resistance to various biological fluids, small molecule drugs, and plasma proteins. In simulating the human gut barrier, the PreD chip demonstrates highly enhanced sensitivity in tests for dexamethasone toxicity and is highly effective in assessing drug transport across the human blood–brain barrier. These findings emphasize the potential of the PreD chip in advancing organ chip–based drug testing methodologies.  a1613-6829