BACKGROUND: The chemokine-chemokine receptor (CR) network is involved in the regulation of cellular infiltration of tumours. Cancer cells and infiltrating macrophages produce a whole range of chemokines. This study explored the expression of some CR and chemokine production by cord blood stem cell-derived CD34(+) monocytes and their novel CD14(++)CD16(+) and CD14(+)CD16(-) subsets in response to tumour cells. MATERIAL AND METHODS: CR expression was determined by flow cytometry and their functional activity by migration to chemoattractants. Monocytes were cultured with tumour cells and the chemokine content was assessed in culture supernatants. RESULTS: CD14(++)CD16(+) monocytes exhibited increased expression of chemokine (C-C) receptor (CCR) 1, while CD14(+)CD16(-) of CCR2, chemokine (C-X-C) receptor (CXCR) 1, 2 and 4. The increased expression of CCR2 on CD14(+)CD16(-) monocytes was associated with their enhanced migration to monocyte chemoattractant protein-1 (CCL2), MCP-3 (CCL7), MCP-2 (CCL8) and MCP-4 (CCL13), while that of CXCR1 and 2 to interleukin 8 (CXCL8), and CXCR4 to stromal cell-derived factor-1 (CXCL12). Tumour cells induced production of macrophage inflammatory protein-1α (CCL3) MIP-1β and regulated on activation normal T-cells expressed and secreted (CCL5) but not CCL2 or CXCL8, monokine induced by gamma interferon (CXCL9), interferon gamma-induced protein 10 (CXCL10). CONCLUSION: The studied monocyte subsets, in comparison to those from blood, exhibit different expression of CRs and response to the stimuli that occur from tumour cells.
BACKGROUND: The chemokine-chemokine receptor (CR) network is involved in the regulation of cellular infiltration of tumours. Cancer cells and infiltrating macrophages produce a whole range of chemokines. This study explored the expression of some CR and chemokine production by cord blood stem cell-derived CD34(+) monocytes and their novel CD14(++)CD16(+) and CD14(+)CD16(-) subsets in response to tumour cells. MATERIAL AND METHODS:CR expression was determined by flow cytometry and their functional activity by migration to chemoattractants. Monocytes were cultured with tumour cells and the chemokine content was assessed in culture supernatants. RESULTS:CD14(++)CD16(+) monocytes exhibited increased expression of chemokine (C-C) receptor (CCR) 1, while CD14(+)CD16(-) of CCR2, chemokine (C-X-C) receptor (CXCR) 1, 2 and 4. The increased expression of CCR2 on CD14(+)CD16(-) monocytes was associated with their enhanced migration to monocyte chemoattractant protein-1 (CCL2), MCP-3 (CCL7), MCP-2 (CCL8) and MCP-4 (CCL13), while that of CXCR1 and 2 to interleukin 8 (CXCL8), and CXCR4 to stromal cell-derived factor-1 (CXCL12). Tumour cells induced production of macrophage inflammatory protein-1α (CCL3) MIP-1β and regulated on activation normal T-cells expressed and secreted (CCL5) but not CCL2 or CXCL8, monokine induced by gamma interferon (CXCL9), interferon gamma-induced protein 10 (CXCL10). CONCLUSION: The studied monocyte subsets, in comparison to those from blood, exhibit different expression of CRs and response to the stimuli that occur from tumour cells.
Authors: Giovanni Luca Gravina; Andrea Mancini; Francesco Marampon; Alessandro Colapietro; Simona Delle Monache; Roberta Sferra; Flora Vitale; Peter J Richardson; Lee Patient; Stephen Burbidge; Claudio Festuccia Journal: J Hematol Oncol Date: 2017-01-05 Impact factor: 17.388