Bone marrow (BM)-derived polymorphonuclear leukocytes (PMNs) and monocytes (MO) induced by cardiopulmonary bypass (CPB) are highly proteolytic and cause postoperative lung injury. Although CCL23/Myeloid progenitor inhibitory factor-1 is a human CC chemokine with potent suppressor effects on myeloid progenitor cells, in vivo inhibitory effects on BM-derived leukocyte kinetics associated with CPB are unknown.
Two-hour CPB was surgically performed in cynomolgus monkeys and BM-derived leukocytes kinetics were monitored postoperatively by flow cytometry with 5’-bromo-2’-deoxyuridine (BrdU) and cytokine ELISA. Monkeys were given CCL23 (n=5) or saline (control, n=5) intravenously daily for 3 days before BrdU labelling and peripheral blood/bronchoalveolar lavage fluid (BALF) timepoint sampling to reveal BrdU-labelled cells. Levels of cytokines, CD11b, and L-selectin were considered leukocytic activation markers.
The CCL23 treatment significantly prolonged BM transit of leukocytes (PMNs, 118.4±11.7–95.5±4.1 hours [control]; MO, 91.6±5.0–62.0±3.0 hours [control]) and reduced their alveolar appearance. The BM pool size of MO was decreased by CCL23 but PMNs were unaffected. CD11b, L-selectin expression of PMNs and MO during CPB, and post-surgical increases of interleukin (IL)-6, IL-8, TNF-α, MCP-1, and PMN elastase in the BALF were not suppressed.
CCL23 treatment slows turnover of PMN and MO progenitors in BM and suppresses their circulatory release and lung recruitment. CCL23 has inhibitory effects specifically on the CPB-induced BM response and could hold value for preventing CPB-induced lung injury.
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Published online: January 09, 2023
Accepted: November 30, 2022
Received in revised form: November 9, 2022
Received: June 15, 2022
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