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We read with great interest the recent publication by Ferrer-Mayorga et al,1 concerning Vitamin D receptor (VDR) signalling’s impacts on cancer-associated fibroblasts (CAFs) in colorectal cancer (CRC). In line with one previous publication regarding VDR in pancreatic cancer (PC),2 activation of VDR signalling in stromal fibroblasts predicts a favourable clinical outcome in CRC. Both reports set the concept in principle that VDR agonists can be explored as a therapy against tumor-associated stroma in PC and CRC. However, detailed mechanisms involved in VDR’s regulation of tumor-stroma crosstalk remained to be elucidated.
Recent publications identified exosomal miRNAs as critical mediators for cellular communication. In this study, we aimed to investigate whether exosomal miRNAs were implicated in VDR’s regulation against the protumoural activity of CAFs. Three immortalised CAF cell lines were generated from PC patients following the protocol reported previously.3 Exosomes released by CAFs were labelled with fluorescent dye 1,1’-dioctadecyl-3,3,3’,3’-tetramethylindocarbocyanine perchlorate (DiI) and incubated with PC cell lines (PANC-1 and SW1990) for 24 hours. Analysis using fluorescence microscopy (figure 1A) and flow cytometry (figure …
FK, LL and GW contributed equally.
Contributors XK and ZL conceived and designed the study. FK and GW performed the experiments. LL assisted with study design and wrote the draft. XD assisted with the acquisition of cancer-associated fibroblast (DPSC).
Funding This work was supported by NSFC no. 81772640 from the National Natural Science Foundation of China.
Competing interests None declared.
Patient consent Not required.
Ethics approval Changhai hospital.
Provenance and peer review Not commissioned; internally peer reviewed.
Correction notice This article has been corrected since it published Online First. The affiliations have been corrected.