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  candidate PCa CTC CRPC

Overall DesignA total of 221 single candidate prostate CTCs were isolated from 18 patients with metastatic prostate cancer and 4 patients with localized prostate cancer. Of these, 133 cells (60%) had RNA of sufficient quality for amplification and next generation RNA sequencing, and 122 (55%) had >100,000 uniquely aligned sequencing reads. In addition to candidate CTCs, we also obtained comprehensive transcriptomes for 12 bulk primary prostate cancers (macrodissected for >70% tumor content), 30 single cells derived from four different prostate cancer cell lines, and 5 patient-derived leukocyte controls. The leukocytes were readily distinguished by their expression of hematopoietic lineage markers and served to exclude any CTCs with potentially contaminating signals. Strict expression thresholds were used to define lineage-confirmed CTCs, scored by prostate lineage-specific genes (PSA, PSMA, AMACR, AR) and standard epithelial markers (KRT7, KRT8, KRT18, KRT19, EpCAM). 28 cells were excluded given the presence of leukocyte transcripts suggestive of cellular contamination or misidentification during selection, and 17 cells were excluded given low expression of both prostate lineage-specific genes and 5 standard epithelial markers. The remaining 77 cells, defined as lineage-confirmed CTCs, displayed expression of either prostate lineage-specific or epithelial genes, and low expression of leukocyte-specific genes, consistent with their tumor of origin.
SummaryProstate cancer is initially responsive to androgen deprivation, but the effectiveness of androgen receptor (AR) inhibitors in recurrent disease is variable. Biopsy of bone metastases is challenging, hence sampling circulating tumor cells (CTCs) may reveal drug resistance mechanisms. We established single cell RNA-sequencing profiles of 77 intact CTCs isolated from 13 patients (mean 6 CTCs/patient) using microfluidic enrichment. Single CTCs from each individual display considerable heterogeneity, including expression of AR gene mutations and splicing variants. Retrospective analysis of CTCs from patients progressing on AR inhibitor, compared with untreated cases indicates activation of noncanonical Wnt signaling (P=0.0064). Ectopic expression of Wnt5a in prostate cancer cells attenuates the antiproliferative effect of AR inhibition, while its suppression in drug-resistant cells restores partial sensitivity, a correlation also evident in an established mouse model. Thus, single cell analysis of prostate CTCs reveals heterogeneity in signaling pathways that could contribute to treatment failure.
Dataset viewGSE67980
PMID26383955

Samples in candidate PCa CTC CRPC

Displaying 31-33 of 33 results.
SeriesSampleInstrumentOrganismTitleCell Source
GSE67980GSM1660103AB 5500xl Genetic AnalyzerHomo sapiensPr9.3.3candidate PCa CTC CRPC
GSE67980GSM1660104AB 5500xl Genetic AnalyzerHomo sapiensPr9.3.4candidate PCa CTC CRPC
GSE67980GSM1660105AB 5500xl Genetic AnalyzerHomo sapiensPr9.3.5candidate PCa CTC CRPC

Gene rank in candidate PCa CTC CRPC

Displaying 71-80 of 18557 results.
Rank orderGene SymbolEnsembl ID
71RPS5ENSG00000083845
72PRDX6ENSG00000117592
73RPS14ENSG00000164587
74GNLYENSG00000115523
75NEAT1ENSG00000245532
76BNIP3LENSG00000104765
77RPS20ENSG00000008988
78YWHAZENSG00000164924
79RPL26ENSG00000161970
80TAGLN2ENSG00000158710