{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,5]],"date-time":"2026-10-05T23:14:16Z","timestamp":1791242056345,"version":"4.1.0"},"reference-count":59,"publisher":"Oxford University Press (OUP)","issue":"5","license":[{"start":{"date-parts":[[2020,5,1]],"date-time":"2020-05-01T00:00:00Z","timestamp":1588291200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/academic.oup.com\/journals\/pages\/open_access\/funder_policies\/chorus\/standard_publication_model"}],"funder":[{"name":"Scientific Research Foundation Flanders"},{"name":"Universitair Ziekenhuis Brussel"},{"DOI":"10.13039\/501100004418","name":"Vrije Universiteit Brussel","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100004418","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2020,5,1]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>STUDY QUESTION<\/jats:title><jats:p>Is it possible to co-culture and functionally link human liver and testis equivalents in the combined medium circuit of a multi-organ chip?<\/jats:p><\/jats:sec><jats:sec><jats:title>SUMMARY ANSWER<\/jats:title><jats:p>Multi-organ-chip co-cultures of human liver and testis equivalents were maintained at a steady-state for at least 1\u00a0week and the co-cultures reproduced specific natural and drug-induced liver\u2013testis systemic interactions.<\/jats:p><\/jats:sec><jats:sec><jats:title>WHAT IS KNOWN ALREADY<\/jats:title><jats:p>Current benchtop reprotoxicity models typically do not include hepatic metabolism and interactions of the liver\u2013testis axis. However, these are important to study the biotransformation of substances.<\/jats:p><\/jats:sec><jats:sec><jats:title>STUDY DESIGN, SIZE, DURATION<\/jats:title><jats:p>Testicular organoids derived from primary adult testicular cells and liver spheroids consisting of cultured HepaRG cells and hepatic stellate cells were loaded into separate culture compartments of each multi-organ-chip circuit for co-culture in liver spheroid-specific medium, testicular organoid-specific medium or a combined medium over a week. Additional multi-organ-chips (single) and well plates (static) were loaded only with testicular organoids or liver spheroids for comparison. Subsequently, the selected type of medium was supplemented with cyclophosphamide, an alkylating anti-neoplastic prodrug that has demonstrated germ cell toxicity after its bioactivation in the liver, and added to chip-based co-cultures to replicate a human liver\u2013testis systemic interaction in vitro. Single chip-based testicular organoids were used as a control. Experiments were performed with three biological replicates unless otherwise stated.<\/jats:p><\/jats:sec><jats:sec><jats:title>PARTICIPANTS\/MATERIALS, SETTING, METHODS<\/jats:title><jats:p>The metabolic activity was determined as glucose consumption and lactate production. The cell viability was measured as lactate dehydrogenase activity in the medium. Additionally, immunohistochemical and real-time quantitative PCR end-point analyses were performed for apoptosis, proliferation and cell-specific phenotypical and functional markers. The functionality of Sertoli and Leydig cells in testicular spheroids was specifically evaluated by measuring daily inhibin B and testosterone release, respectively.<\/jats:p><\/jats:sec><jats:sec><jats:title>MAIN RESULTS AND THE ROLE OF CHANCE<\/jats:title><jats:p>Co-culture in multi-organ chips with liver spheroid-specific medium better supported the metabolic activity of the cultured tissues compared to other media tested. The liver spheroids did not show significantly different behaviour during co-culture compared to that in single culture on multi-organ-chips. The testicular organoids also developed accordingly and produced higher inhibin B but lower testosterone levels than the static culture in plates with testicular organoid-specific medium. By comparison, testosterone secretion by testicular organoids cultured individually on multi-organ-chips reached a similar level as the static culture at Day 7. This suggests that the liver spheroids have metabolised the steroids in the co-cultures, a naturally occurring phenomenon. The addition of cyclophosphamide led to upregulation of specific cytochromes in liver spheroids and loss of germ cells in testicular organoids in the multi-organ-chip co-cultures but not in single-testis culture.<\/jats:p><\/jats:sec><jats:sec><jats:title>LARGE-SCALE DATA<\/jats:title><jats:p>N\/A<\/jats:p><\/jats:sec><jats:sec><jats:title>LIMITATIONS, REASONS FOR CAUTION<\/jats:title><jats:p>The number of biological replicates included in this study was relatively small due to the limited availability of individual donor testes and the labour-intensive nature of multi-organ-chip co-cultures. Moreover, testicular organoids and liver spheroids are miniaturised organ equivalents that capture key features, but are still simplified versions of the native tissues. Also, it should be noted that only the prodrug cyclophosphamide was administered. The final concentration of the active metabolite was not measured.<\/jats:p><\/jats:sec><jats:sec><jats:title>WIDER IMPLICATIONS OF THE FINDINGS<\/jats:title><jats:p>This co-culture model responds to the request of setting up a specific tool that enables the testing of candidate reprotoxic substances with the possibility of human biotransformation. It further allows the inclusion of other human tissue equivalents for chemical risk assessment on the systemic level.<\/jats:p><\/jats:sec><jats:sec><jats:title>STUDY FUNDING\/COMPETING INTEREST(S)<\/jats:title><jats:p>This work was supported by research grants from the Scientific Research Foundation Flanders (FWO), Universitair Ziekenhuis Brussel (scientific fund Willy Gepts) and the Vrije Universiteit Brussel. Y.B. is a postdoctoral fellow of the FWO. U.M. is founder, shareholder and CEO of TissUse GmbH, Berlin, Germany, a company commercializing the Multi-Organ-Chip platform systems used in the study. The other authors have no conflict of interest to declare.<\/jats:p><\/jats:sec>","DOI":"10.1093\/humrep\/deaa057","type":"journal-article","created":{"date-parts":[[2020,3,9]],"date-time":"2020-03-09T20:22:49Z","timestamp":1583785369000},"page":"1029-1044","source":"Crossref","is-referenced-by-count":112,"title":["A multi-organ-chip co-culture of liver and testis equivalents: a first step toward a systemic male reprotoxicity model"],"prefix":"10.1093","volume":"35","author":[{"given":"Y","family":"Baert","sequence":"first","affiliation":[{"name":"Biology of the Testis (BITE) Research Group, Department of Reproduction, Genetics and Regenerative Medicine, Vrije Universiteit Brussel (VUB), Laarbeeklaan 103, 1090 Brussels, Belgium"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"I","family":"Ruetschle","sequence":"first","affiliation":[{"name":"TissUse GmbH, Oudenarder Str. 16, 13347 Berlin, 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