{"id":9125,"date":"2026-09-30T17:58:17","date_gmt":"2026-09-30T16:58:17","guid":{"rendered":"https:\/\/seamlessbio.de\/?p=9125"},"modified":"2026-09-30T17:58:19","modified_gmt":"2026-09-30T16:58:19","slug":"ich-m12-transporter-compliance-assays","status":"publish","type":"post","link":"https:\/\/seamlessbio.de\/de\/ich-m12-transporter-compliance-assays\/","title":{"rendered":"ICH M12 Transporter"},"content":{"rendered":"<!-- ============================================================\n   SeamlessBio Blog Post \u2014 sb-bp Format\n   Slug:        ich-m12-transporter-compliance-assays\n   SEO Title:   ICH M12 Transporter Compliance: Which Assays You Need  (54 chars \u2713)\n   Meta Desc:   ICH M12 (2024) defines the transporter DDI testing package. A practical breakdown of which assays are required, when, and why \u2014 with kit options. (149 chars \u2713)\n   Keyphrase:   ICH M12 transporter compliance assays\n   Int. links:  \/products\/dmpk-transporter-kit\/drug-transporter-assay-service-ciptec\/ \u00b7 \/resources\/ \u00b7 \/contact\/\n   ============================================================ -->\n\n\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"BreadcrumbList\",\n  \"@id\": \"https:\/\/seamlessbio.de\/ich-m12-transporter-compliance-assays\/#breadcrumb\",\n  \"itemListElement\": [\n    {\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/seamlessbio.de\/\"},\n    {\"@type\":\"ListItem\",\"position\":2,\"name\":\"Blog\",\"item\":\"https:\/\/seamlessbio.de\/blog\/\"},\n    {\"@type\":\"ListItem\",\"position\":3,\"name\":\"ICH M12 Transporter Compliance: Which Assays You Need\",\"item\":\"https:\/\/seamlessbio.de\/ich-m12-transporter-compliance-assays\/\"}\n  ]\n}\n<\/script>\n\n\n\n<style>\n.sb-bpdm1-hero{background:linear-gradient(135deg,#18b7b2 0%,#0d9490 100%);border-radius:12px;padding:48px 40px;margin-bottom:36px}\n.sb-bpdm1-hero h1{color:#fff!important;font-size:2rem;font-weight:700;line-height:1.25;margin:0 0 14px 0}\n.sb-bpdm1-hero .meta{font-size:.8rem;color:rgba(255,255,255,.75)!important;margin:0 0 18px 0;text-transform:uppercase;letter-spacing:.03em}\n.sb-bpdm1-hero p{color:rgba(255,255,255,.95)!important;font-size:1.1rem;line-height:1.65;max-width:720px;margin:0}\n.sb-bpdm1-card{background:#fff;border:1px solid #e8f7f7;border-radius:10px;padding:36px 40px;margin-bottom:28px}\n.sb-bpdm1-card h2{font-size:1.35rem;font-weight:700;color:#0e1c2a;margin:0 0 16px 0}\n.sb-bpdm1-card h3{font-size:1.05rem;font-weight:600;color:#18b7b2;margin:22px 0 10px 0}\n.sb-bpdm1-card p{color:#374151;line-height:1.7;margin:0 0 14px 0}\n.sb-bpdm1-card p:last-child{margin-bottom:0}\n.sb-bpdm1-hl{background:#f0faf9;border-left:4px solid #18b7b2;border-radius:0 8px 8px 0;padding:20px 24px;margin:24px 0;color:#1a3a3a;line-height:1.65}\n.sb-bpdm1-hl strong{color:#0d9490}\n.sb-bpdm1-table-wrap{overflow-x:auto;margin:16px 0}\n.sb-bpdm1-table{width:100%;border-collapse:collapse;font-size:.88rem}\n.sb-bpdm1-table th{background:#18b7b2;color:#fff!important;padding:11px 14px;text-align:left;font-weight:600}\n.sb-bpdm1-table td{padding:9px 14px;border-bottom:1px solid #e8f7f7;color:#374151;vertical-align:top}\n.sb-bpdm1-table tr:nth-child(even) td{background:#f4fefe}\n.sb-bpdm1-yes{color:#18b7b2;font-weight:700;text-align:center}\n.sb-bpdm1-con{color:#e07a00;font-weight:600;text-align:center}\n.sb-bpdm1-no{color:#9ca3af;text-align:center}\n.sb-bpdm1-cta{background:#18b7b2;border-radius:12px;padding:40px;text-align:center;margin-bottom:28px}\n.sb-bpdm1-cta h2{color:#fff!important;font-size:1.5rem;font-weight:700;margin:0 0 12px 0}\n.sb-bpdm1-cta p{color:rgba(255,255,255,.9)!important;margin:0 0 24px 0}\n.sb-bpdm1-cta a.btn{display:inline-block;background:#fff;color:#18b7b2!important;font-weight:700;padding:14px 32px;border-radius:8px;text-decoration:none;font-size:1rem;margin:0 8px 8px 8px}\n.sb-bpdm1-cta a.btn:hover{opacity:.88}\n.sb-bpdm1-cta a.outline{background:transparent;color:#fff!important;border:2px solid rgba(255,255,255,.8)}\n.sb-bpdm1-faq{margin-bottom:28px}\n.sb-bpdm1-faq h2{font-size:1.35rem;font-weight:700;color:#0e1c2a;margin:0 0 20px 0}\n.sb-bpdm1-faq details{border:1px solid #e8f7f7;border-radius:8px;margin-bottom:10px}\n.sb-bpdm1-faq summary{background:#f9fdfd;padding:16px 44px 16px 20px;font-weight:600;color:#0e1c2a;cursor:pointer;list-style:none;position:relative}\n.sb-bpdm1-faq summary::after{content:\"+\";position:absolute;right:20px;top:50%;transform:translateY(-50%);font-size:1.3rem;color:#18b7b2;font-weight:300}\n.sb-bpdm1-faq details[open] summary::after{content:\"\u2212\"}\n.sb-bpdm1-faq details[open] summary{background:#e8f7f7}\n.sb-bpdm1-faq .body{padding:16px 20px;color:#374151;line-height:1.7}\n@media(max-width:680px){.sb-bpdm1-hero{padding:32px 20px}.sb-bpdm1-hero h1{font-size:1.5rem}.sb-bpdm1-card{padding:24px 20px}.sb-bpdm1-cta{padding:28px 20px}}\n<\/style>\n<div class=\"sb-bpdm1-hero\">\n  <p class=\"meta\">Blog \u00b7 DMPK \u00b7 ICH M12 \u00b7 Transporter Assays \u00b7 October 2026 \u00b7 9 min read<\/p>\n  <h1>ICH M12 Transporter Compliance: Which Assays You Need and When<\/h1>\n  <p>ICH M12 \u2014 adopted in 2024 \u2014 is now the global harmonised guideline for drug interaction studies. For DMPK scientists, it defines exactly which transporter assays are required, which are discretionary, and what the decision triggers are. This post breaks it down into a practical reference.<\/p>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">What Is ICH M12 and Why It Matters for Transporter Assays<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">ICH M12 (Guideline on Drug Interaction Studies) was adopted by the ICH Assembly in 2024 and supersedes the previous FDA (2020) and EMA (2013) DDI guidelines as the globally harmonised framework. It is now the primary reference for any IND\/NDA\/IMPD submission to the FDA, EMA, PMDA (Japan) or Health Canada that includes transporter DDI data.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The key change from the previous regional guidelines: ICH M12 adopts a unified decision framework \u2014 a set of explicit mechanistic cut-offs and tiered testing criteria \u2014 that replaces the partially contradictory and often ambiguous advice in the regional guidelines. For DMPK labs, this means more predictable testing requirements but also less flexibility to argue edge cases away without data.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">The Core Transporter Panel: What Is Always Required<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">ICH M12 defines a set of nine transporters that must be assessed as potential inhibition targets for every new drug candidate submitted for regulatory approval. These are:<\/p>\n\n\n\n<div class=\"sb-bpdm1-table-wrap\">\n  <table class=\"sb-bpdm1-table\">\n    <thead>\n      <tr><th>Transporter<\/th><th>Gene<\/th><th>Location<\/th><th>Inhibition Required?<\/th><th>Substrate Required?<\/th><th>Available via Cell4Pharma \/ ciPTEC<\/th><\/tr>\n    <\/thead>\n    <tbody>\n      <tr><td><strong>P-gp (MDR1)<\/strong><\/td><td>ABCB1<\/td><td>Intestine, liver, kidney, BBB<\/td><td class=\"sb-bpdm1-yes\">Yes<\/td><td class=\"sb-bpdm1-yes\">Yes (if P-gp is a major elimination pathway)<\/td><td>\u2713 Vesicle Kit<\/td><\/tr>\n      <tr><td><strong>BCRP<\/strong><\/td><td>ABCG2<\/td><td>Intestine, liver, kidney, BBB<\/td><td class=\"sb-bpdm1-yes\">Yes<\/td><td class=\"sb-bpdm1-yes\">Yes<\/td><td>\u2713 Vesicle Kit<\/td><\/tr>\n      <tr><td><strong>OATP1B1<\/strong><\/td><td>SLCO1B1<\/td><td>Hepatic basolateral<\/td><td class=\"sb-bpdm1-yes\">Yes<\/td><td class=\"sb-bpdm1-yes\">Yes (if hepatic uptake involved)<\/td><td>Cell-based (HEK293)<\/td><\/tr>\n      <tr><td><strong>OATP1B3<\/strong><\/td><td>SLCO1B3<\/td><td>Hepatic basolateral<\/td><td class=\"sb-bpdm1-yes\">Yes<\/td><td class=\"sb-bpdm1-yes\">Yes<\/td><td>Cell-based (HEK293)<\/td><\/tr>\n      <tr><td><strong>OAT1<\/strong><\/td><td>SLC22A6<\/td><td>Renal basolateral<\/td><td class=\"sb-bpdm1-yes\">Yes<\/td><td class=\"sb-bpdm1-yes\">Yes (if \u226525% active renal secretion)<\/td><td>\u2713 ciPTEC-OAT1<\/td><\/tr>\n      <tr><td><strong>OAT3<\/strong><\/td><td>SLC22A8<\/td><td>Renal basolateral<\/td><td class=\"sb-bpdm1-yes\">Yes<\/td><td class=\"sb-bpdm1-yes\">Yes<\/td><td>\u2713 ciPTEC-OAT3<\/td><\/tr>\n      <tr><td><strong>OCT2<\/strong><\/td><td>SLC22A2<\/td><td>Renal basolateral<\/td><td class=\"sb-bpdm1-yes\">Yes<\/td><td class=\"sb-bpdm1-yes\">Yes<\/td><td>\u2713 ciPTEC-OAT1 (endogenous)<\/td><\/tr>\n      <tr><td><strong>MATE1<\/strong><\/td><td>SLC47A1<\/td><td>Renal apical, liver<\/td><td class=\"sb-bpdm1-yes\">Yes<\/td><td class=\"sb-bpdm1-yes\">Yes<\/td><td>\u2713 ciPTEC-OAT1 (endogenous)<\/td><\/tr>\n      <tr><td><strong>MATE2-K<\/strong><\/td><td>SLC47A2<\/td><td>Renal apical<\/td><td class=\"sb-bpdm1-yes\">Yes<\/td><td class=\"sb-bpdm1-yes\">Yes<\/td><td>\u2713 ciPTEC-OAT1 (endogenous)<\/td><\/tr>\n    <\/tbody>\n  <\/table>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Additional Transporters: When They Are Triggered<\/h2>\n\n\n\n<div class=\"sb-bpdm1-table-wrap\">\n  <table class=\"sb-bpdm1-table\">\n    <thead>\n      <tr><th>Transporter<\/th><th>Trigger Condition<\/th><th>Assay Format<\/th><\/tr>\n    <\/thead>\n    <tbody>\n      <tr><td><strong>BSEP<\/strong> (ABCB11)<\/td><td>Hepatobiliary elimination pathway, or DILI risk signal present<\/td><td>Vesicle inhibition assay \u2014 \u2713 Cell4Pharma BSEP Kit<\/td><\/tr>\n      <tr><td><strong>MRP2<\/strong> (ABCC2)<\/td><td>Involvement of glucuronide metabolite biliary excretion suspected<\/td><td>Vesicle inhibition assay \u2014 \u2713 Cell4Pharma MRP2 Kit<\/td><\/tr>\n      <tr><td><strong>OCT1<\/strong><\/td><td>Hepatic uptake cannot be fully explained by OATP1B1\/1B3<\/td><td>Cell-based (hepatocytes or OCT1-HEK293)<\/td><\/tr>\n      <tr><td><strong>OATP2B1<\/strong><\/td><td>Intestinal absorption faster than passive permeability suggests<\/td><td>Cell-based (OATP2B1-HEK293)<\/td><\/tr>\n      <tr><td><strong>MRP3\/4<\/strong><\/td><td>Renal or hepatic efflux of metabolites<\/td><td>Vesicle assay \u2014 \u2713 Cell4Pharma MRP3\/MRP4 Kits<\/td><\/tr>\n      <tr><td><strong>P-gp (CNS)<\/strong><\/td><td>CNS indication or compound that may cross the BBB<\/td><td>Bidirectional permeability (MDR1-MDCK or Caco-2)<\/td><\/tr>\n    <\/tbody>\n  <\/table>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">The ICH M12 Decision Logic: When to Stop Testing<\/h2>\n\n\n\n<div class=\"sb-bpdm1-card\">\n  <h3>Inhibition screening: the basic R-value cut-off<\/h3>\n  <p>For each transporter in the core panel, the first in vitro step is an inhibition screen at a single concentration. ICH M12 aligns with the established R-value criterion: if the ratio of the maximum unbound clinical plasma concentration (Cmax,u) to the in vitro IC50 exceeds 0.1 (R = 1 + Cmax,u\/IC50 &gt; 1.1 for some transporters), a clinical DDI study is triggered. Below this threshold, clinical interaction risk is considered low.<\/p>\n\n  <h3>Substrate assessment: when is active transport clinically relevant?<\/h3>\n  <p>For substrate studies, ICH M12 applies a pathway contribution threshold: active renal secretion must account for \u226525% of total renal clearance before OCT2\/MATE and OAT substrate assessment is considered mandatory. For hepatic uptake transporters (OATP1B1\/1B3), the criterion is whether hepatic uptake is a significant elimination pathway. If both conditions are clearly not met, substrate testing can be deferred with adequate mechanistic justification.<\/p>\n\n  <h3>The BSEP exception<\/h3>\n  <p>BSEP is not part of the nine mandatory inhibition targets for all compounds. It is triggered specifically when the compound has a hepatobiliary elimination pathway or when non-clinical findings (elevated bile acids, cholestatic histopathology, hepatocyte vacuolation) suggest a DILI risk. When triggered, BSEP inhibition data must be included in the regulatory package. In DILI-sensitive development programmes, many sponsors run BSEP inhibition screening early in the discovery phase regardless of regulatory trigger, using vesicle kits like the Cell4Pharma BSEP Kit for rapid screening.<\/p>\n<\/div>\n\n\n\n<div class=\"sb-bpdm1-hl\">\n  <strong>Key practical point:<\/strong> ICH M12 explicitly allows in vitro transporter data to replace clinical DDI studies when the mechanistic case is clear and the R-value is below the trigger threshold. This makes high-quality in vitro data \u2014 generated with validated assay systems \u2014 more important than ever. Weak or under-validated in vitro data no longer provides regulatory cover; it can trigger additional clinical studies.\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">How Cell4Pharma Kits and ciPTEC Map to ICH M12<\/h2>\n\n\n\n<div class=\"sb-bpdm1-card\">\n  <h2>SeamlessBio DMPK portfolio \u2014 ICH M12 coverage<\/h2>\n  <p><strong>ABC transporter vesicle kits<\/strong> (Cell4Pharma, distributed by SeamlessBio in DACH): P-gp (ABCB1), BCRP (ABCG2), BSEP, MRP1\u20135, MRP8 \u2014 expressed in HEK293-derived inside-out membrane vesicles. Covers the full efflux transporter inhibition panel required under ICH M12.<\/p>\n  <p><strong>ciPTEC renal cell lines<\/strong> (Cell4Pharma): ciPTEC-OAT1 expresses OAT1, OAT3, OCT2, MATE1, MATE2-K, P-gp, BCRP and MRP2\/4 endogenously \u2014 covering the complete renal transporter substrate panel mandated under ICH M12 in a single cell line. AstraZeneca-validated, FDA\/EMA DDI guideline-compliant expression confirmed.<\/p>\n<\/div>\n\n\n\n<div class=\"sb-bpdm1-cta\">\n  <h2>ICH M12 Transporter Kits \u2014 In-House or Service<\/h2>\n  <p>Cell4Pharma ABC transporter vesicle kits and ciPTEC cell lines \u2014 available for in-house DMPK screening in DACH. Free test samples available. SeamlessBio is the exclusive DACH distributor for Cell4Pharma.<\/p>\n  <a href=\"https:\/\/seamlessbio.de\/products\/dmpk-transporter-kit\/drug-transporter-assay-service-ciptec\/\" class=\"btn\">View DMPK Portfolio<\/a>\n  <a href=\"https:\/\/seamlessbio.de\/contact\/\" class=\"btn outline\">Request a Free Test Kit<\/a>\n<\/div>\n\n\n\n<div class=\"sb-bpdm1-faq\">\n  <h2>Frequently Asked Questions<\/h2>\n  <details><summary>What is the difference between ICH M12 and the previous FDA\/EMA DDI guidelines?<\/summary><div class=\"body\">ICH M12 is the globally harmonised replacement for the regional FDA (2020 DDI Guidance) and EMA (2013 DDI Guideline). The core transporter panel is largely the same \u2014 nine mandatory inhibition targets \u2014 but ICH M12 introduces unified mechanistic cut-off criteria, clearer guidance on when substrate testing is triggered, and explicit harmonisation between jurisdictions. For sponsors submitting to multiple regulatory agencies simultaneously, ICH M12 reduces the need to tailor DDI packages per region.<\/div><\/details>\n  <details><summary>Is BSEP testing required for every drug candidate under ICH M12?<\/summary><div class=\"body\">No \u2014 BSEP is not part of the nine mandatory transporter inhibition targets that apply to every compound. BSEP testing is triggered when the compound has a hepatobiliary elimination route or when non-clinical findings suggest a DILI risk (e.g. elevated bile acids, cholestatic histopathology). Many sponsors include early BSEP screening anyway as a risk management strategy, using vesicle assays for rapid, low-cost initial assessment.<\/div><\/details>\n  <details><summary>Can ciPTEC cells be used to satisfy ICH M12 renal transporter requirements?<\/summary><div class=\"body\">Yes. ciPTEC-OAT1 expresses OAT1, OAT3, OCT2, MATE1 and MATE2-K \u2014 the five renal transporters in the ICH M12 core panel \u2014 plus additional efflux transporters (P-gp, BCRP, MRP2, MRP4). This makes ciPTEC-OAT1 capable of generating the renal substrate and inhibition data required under ICH M12 in a single, validated cell system. ciPTEC has been validated by AstraZeneca and cited in peer-reviewed publications that meet current regulatory standards.<\/div><\/details>\n  <details><summary>What R-value cut-off does ICH M12 use for transporter inhibition screening?<\/summary><div class=\"body\">For most transporters in the ICH M12 core panel, the trigger criterion is based on the ratio of maximum unbound plasma concentration (Cmax,u) to the in vitro IC50. The specific cut-offs vary by transporter: for intestinal P-gp and BCRP the criterion uses the intestinal concentration [I] instead of Cmax,u. Always consult the current ICH M12 guideline text and your regional authority&#8217;s implementation notes for the exact cut-off values, as these may be refined in regional annexes.<\/div><\/details>\n<\/div>\n\n\n\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\"@type\":\"Question\",\"name\":\"What is the difference between ICH M12 and the previous FDA\/EMA DDI guidelines?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"ICH M12 is the globally harmonised replacement for the regional FDA (2020) and EMA (2013) DDI guidelines. It introduces unified mechanistic cut-off criteria, clearer guidance on when substrate testing is triggered, and explicit harmonisation between jurisdictions.\"}},\n    {\"@type\":\"Question\",\"name\":\"Is BSEP testing required for every drug candidate under ICH M12?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No \u2014 BSEP testing is triggered when the compound has a hepatobiliary elimination route or when non-clinical findings suggest a DILI risk. Many sponsors include early BSEP screening anyway as a risk management strategy.\"}},\n    {\"@type\":\"Question\",\"name\":\"Can ciPTEC cells be used to satisfy ICH M12 renal transporter requirements?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. ciPTEC-OAT1 expresses OAT1, OAT3, OCT2, MATE1 and MATE2-K \u2014 the five renal transporters in the ICH M12 core panel \u2014 plus P-gp, BCRP, MRP2, MRP4. 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Consult the current ICH M12 guideline text and regional implementation notes for exact values.\"}}\n  ]\n}\n<\/script>\n","protected":false},"excerpt":{"rendered":"<p>Blog \u00b7 DMPK \u00b7 ICH M12 \u00b7 Transporter Assays \u00b7 October 2026 \u00b7 9 min read ICH M12 Transporter Compliance: Which Assays You Need and When ICH M12 \u2014 adopted [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","_templately_pack_id":"","_templately_imported_at":"","_templately_source":"","_templately_import_session_id":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-9125","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>ICH M12 Transporter Compliance: Which Assays You Need<\/title>\n<meta name=\"description\" content=\"ICH M12 (2024) defines the transporter DDI testing package. 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