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  candidate PCa CTC CSPC

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 CSPC

Displaying 11-12 of 12 results.
SeriesSampleInstrumentOrganismTitleCell Source
GSE67980GSM1660116AB 5500xl Genetic AnalyzerHomo sapiensPr6.1.4candidate PCa CTC CSPC
GSE67980GSM1660117AB 5500xl Genetic AnalyzerHomo sapiensPr8.1.2candidate PCa CTC CSPC

Gene rank in candidate PCa CTC CSPC

Displaying 61-70 of 18557 results.
Rank orderGene SymbolEnsembl ID
61RPSAENSG00000168028
62RPL9ENSG00000163682
63HSPA8ENSG00000109971
64RPL41ENSG00000229117
65ARPC2ENSG00000163466
66BTF3ENSG00000145741
67RPL26ENSG00000161970
68RPL15ENSG00000174748
69GNLYENSG00000115523
70GNASENSG00000087460