Extracellular Matrix in Synthetic Hydrogel-Based Prostate Cancer Organoids Regulate Therapeutic Response to EZH2 and DRD2 Inhibitors.

TitleExtracellular Matrix in Synthetic Hydrogel-Based Prostate Cancer Organoids Regulate Therapeutic Response to EZH2 and DRD2 Inhibitors.
Publication TypeJournal Article
Year of Publication2021
AuthorsMosquera MJ, Kim S, Bareja R, Fang Z, Cai S, Pan H, Asad M, Martin MLaura, Sigouros M, Rowdo FM, Ackermann S, Capuano J, Bernheim J, Cheung C, Doane A, Brady N, Singh R, Rickman DS, Prabhu V, Allen JE, Puca L, Coskun AF, Rubin MA, Beltran H, Mosquera JMiguel, Elemento O, Singh A
JournalAdv Mater
Date Published2021 Oct 22

Following treatment with androgen receptor (AR) pathway inhibitors, ≈20% of prostate cancer patients progress by shedding their AR-dependence. These tumors undergo epigenetic reprogramming turning castration-resistant prostate cancer adenocarcinoma (CRPC-Adeno) into neuroendocrine prostate cancer (CRPC-NEPC). No targeted therapies are available for CRPC-NEPCs, and there are minimal organoid models to discover new therapeutic targets against these aggressive tumors. Here, using a combination of patient tumor proteomics, RNA sequencing, spatial-omics, and a synthetic hydrogel-based organoid, putative extracellular matrix (ECM) cues that regulate the phenotypic, transcriptomic, and epigenetic underpinnings of CRPC-NEPCs are defined. Short-term culture in tumor-expressed ECM differentially regulated DNA methylation and mobilized genes in CRPC-NEPCs. The ECM type distinctly regulates the response to small-molecule inhibitors of epigenetic targets and Dopamine Receptor D2 (DRD2), the latter being an understudied target in neuroendocrine tumors. In vivo patient-derived xenograft in immunocompromised mice showed strong anti-tumor response when treated with a DRD2 inhibitor. Finally, we demonstrate that therapeutic response in CRPC-NEPCs under drug-resistant ECM conditions can be overcome by first cellular reprogramming with epigenetic inhibitors, followed by DRD2 treatment. The synthetic organoids suggest the regulatory role of ECM in therapeutic response to targeted therapies in CRPC-NEPCs and enable the discovery of therapies to overcome resistance.

Alternate JournalAdv Mater
PubMed ID34676924
Grant List5P50CA211024 / NH / NIH HHS / United States
5R01AI132738-04 / NH / NIH HHS / United States
1T32EB023860-01A1 / NH / NIH HHS / United States
1R01CA238745-01A1 / / Wellcome Leap HOPE Program National Institutes of Health /
DMR-1554275 / / National Science Foundation /
EEC-1648035 / / Burroughs Wellcome Fund National Science Foundation /
Related Faculty: 
Nicholas Brady, Ph.D.

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