{"id":7227,"date":"2026-08-22T23:04:27","date_gmt":"2026-08-22T21:04:27","guid":{"rendered":"https:\/\/zencellowl.com\/?page_id=7227"},"modified":"2026-08-22T23:13:27","modified_gmt":"2026-08-22T21:13:27","slug":"scratch-assay-live-cell-imaging","status":"publish","type":"page","link":"https:\/\/zencellowl.com\/es\/scratch-assay-live-cell-imaging\/","title":{"rendered":"What is a scratch assay?"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"7227\" class=\"elementor elementor-7227\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-ded38d4 e-flex e-con-boxed e-con e-parent\" data-id=\"ded38d4\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-72cb29e elementor-widget elementor-widget-html\" data-id=\"72cb29e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<p>The scratch assay \u2014 also called wound healing assay \u2014 is an in vitro cell migration assay in which a cell-free gap is created in a confluent monolayer and the rate of gap closure is measured over time using time-lapse microscopy. It is one of the most widely published methods in cell biology, with applications in cancer biology, drug discovery, toxicology, and wound healing research.<\/p>\n\n<p><strong>zenCELL owl automates the scratch assay completely:<\/strong> it images all 24 wells every 5\u201330 minutes inside the CO\u2082 incubator, calculates gap area, % wound closure, migration rate (\u00b5m\u00b2\/h), and t\u00bd gap closure time automatically \u2014 without removing the plate from the incubator at any point.<\/p>\n\n<hr>\n\n<h2>What is a scratch assay?<\/h2>\n<p>A scratch assay creates a defined cell-free gap (\"wound\") in a confluent cell monolayer. Cells at the wound edge migrate into the gap, progressively closing it over 12\u201372 hours. The rate of closure reflects the migratory capacity of the cells and is quantified as % wound closure per timepoint, migration rate in \u00b5m\u00b2\/h, or t\u00bd gap closure time.<\/p>\n\n<h2>What cell lines are compatible with the scratch assay?<\/h2>\n<p>Any adherent cell line that forms a confluent monolayer is compatible. Commonly used cell lines include:<\/p>\n<ul>\n<li><strong>Epithelial:<\/strong> HeLa, HaCaT, A549, Caco-2, MCF-7, MDA-MB-231, T47D<\/li>\n<li><strong>Endothelial:<\/strong> HUVEC, HMEC-1<\/li>\n<li><strong>Fibroblasts:<\/strong> NIH-3T3, primary dermal fibroblasts<\/li>\n<li><strong>Other:<\/strong> PC-3, DU145, U87, primary keratinocytes<\/li>\n<\/ul>\n<p>Non-adherent suspension cells cannot be used for scratch assays.<\/p>\n\n<h2>How long does a scratch assay take?<\/h2>\n<p>Total assay duration depends on cell line migration speed. Fast-migrating lines (HeLa, A549): 12\u201324 hours to full closure. Slow-migrating lines (primary fibroblasts, HUVEC): 48\u201372 hours. Imaging intervals: every 5\u201330 minutes for complete kinetic data. With zenCELL owl, the assay runs continuously inside the incubator without any manual intervention after plate insertion.<\/p>\n\n<h2>Do I need a fluorescence microscope for a scratch assay?<\/h2>\n<p>No. The scratch assay runs entirely in brightfield \u2014 cell-free wound area is visible without staining, labelling, or fluorescent dyes. A fluorescence microscope is only required if your assay additionally measures a fluorescent reporter (e.g. GFP-tagged protein). For standard migration measurement, brightfield is sufficient and preferred \u2014 it eliminates phototoxicity risk.<\/p>\n\n<h2>What is the difference between pipette tip scratch and photochemical wound creation?<\/h2>\n<p>Pipette tip scratching produces wound width CV of 30\u201360% across operators \u2014 a major source of irreproducibility. ScratchMaker Plates use UV-A photochemical wound creation through a precision mask, achieving CV below 5%. The wound position is fixed relative to the well, eliminating repositioning errors between timepoints. ScratchMaker Plates are compatible with any brightfield microscope and with zenCELL owl.<\/p>\n\n<h2>How is scratch assay data analyzed?<\/h2>\n<p>The primary metric is % wound closure: (A\u2080 \u2212 A\u209c) \/ A\u2080 \u00d7 100, where A\u2080 is wound area at T=0 and A\u209c is wound area at timepoint t. Secondary metrics: migration rate (\u00b5m\u00b2\/h) from the slope of the closure curve, and t\u00bd gap closure time. zenCELL owl calculates all metrics automatically. For manual analysis, the free ImageJ Wound Healing Size Tool (Suarez-Arnedo et al., PLoS ONE 2020) is the standard method.<\/p>\n\n<h2>What publications use zenCELL owl for scratch assays?<\/h2>\n<p>Over 50 peer-reviewed publications document zenCELL owl scratch assay data across oncology, pharmacology, toxicology, and tissue engineering. See the <a href=\"https:\/\/zencellowl.com\/publication\/\">Publications page<\/a> for a full list.<\/p>\n\n<h2>How does zenCELL owl perform the scratch assay?<\/h2>\n<p>Place the scratched or ScratchMaker plate inside the CO\u2082 incubator. zenCELL owl automatically captures T=0 images of all 24 wells simultaneously within minutes of plate insertion. Time-lapse imaging runs continuously at user-defined intervals. The software calculates gap area, % wound closure, migration rate, and t\u00bd for each well at every timepoint. Data exports as CSV. No manual ImageJ analysis required.<\/p>\n\n<table>\n<thead>\n<tr><th>Parameter<\/th><th>zenCELL owl<\/th><th>Manual Microscopy<\/th><\/tr>\n<\/thead>\n<tbody>\n<tr><td>Wells imaged simultaneously<\/td><td>24<\/td><td>1<\/td><\/tr>\n<tr><td>T=0 imaging<\/td><td>All wells simultaneously, &lt;5 min<\/td><td>Sequential, 30\u201390 min delay<\/td><\/tr>\n<tr><td>Incubator disruption<\/td><td>None<\/td><td>Every timepoint<\/td><\/tr>\n<tr><td>Analysis<\/td><td>Automatic<\/td><td>Manual ImageJ, 5\u201310 min\/well<\/td><\/tr>\n<tr><td>Kinetic resolution<\/td><td>Every 5\u201330 min, 72h+<\/td><td>Limited by operator availability<\/td><\/tr>\n<\/tbody>\n<\/table>\n\n<p><a href=\"https:\/\/zencellowl.com\/live-remotedemo\/\"><strong>Book a free demo \u2192<\/strong><\/a> See the scratch assay running live in zenCELL owl with real cells.<\/p>\n\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    { \"@type\": \"Question\", \"name\": \"What is a scratch assay?\", \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"A scratch assay creates a cell-free gap in a confluent monolayer. 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