Volume 54, Issue 11 pp. 2811-2819
TRANSFUSION COMPLICATIONS

Heme-related molecules induce rapid production of neutrophil extracellular traps

Mari Kono

Corresponding Author

Mari Kono

Cell Analysis Center, Scientific Affairs, Sysmex Corporation, Kobe, Japan

Address reprint requests to: Mari Kono, 1-3-2 Murotani, Nishi-ku, Kobe 651-2241, Japan; e-mail: [email protected].Search for more papers by this author
Katsuyasu Saigo

Katsuyasu Saigo

Faculty of Pharmacological Sciences, Himeji Dokkyo University, Himeji, Japan

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Yuri Takagi

Yuri Takagi

Cell Analysis Center, Scientific Affairs, Sysmex Corporation, Kobe, Japan

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Takayuki Takahashi

Takayuki Takahashi

Department of Hematology, Shinko Hospital, Kobe, Japan

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Sawako Kawauchi

Sawako Kawauchi

Cell Analysis Center, Scientific Affairs, Sysmex Corporation, Kobe, Japan

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Atsushi Wada

Atsushi Wada

Cell Analysis Center, Scientific Affairs, Sysmex Corporation, Kobe, Japan

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Makoto Hashimoto

Makoto Hashimoto

Blood Transfusion Division, Kobe University Hospital, Kobe, Japan

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Yosuke Minami

Yosuke Minami

Blood Transfusion Division, Kobe University Hospital, Kobe, Japan

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Shion Imoto

Shion Imoto

Department of Health Science, Kobe Tokiwa University, Kobe, Japan

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Mariko Takenokuchi

Mariko Takenokuchi

Faculty of Pharmacological Sciences, Himeji Dokkyo University, Himeji, Japan

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Takashi Morikawa

Takashi Morikawa

Cell Analysis Center, Scientific Affairs, Sysmex Corporation, Kobe, Japan

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Kunihiro Funakoshi

Kunihiro Funakoshi

Cell Analysis Center, Scientific Affairs, Sysmex Corporation, Kobe, Japan

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First published: 28 May 2014
Citations: 39

Abstract

Background

Pulmonary endothelial cell damages caused by neutrophil overactivation could result in acute lung injuries including transfusion-related acute lung injury (TRALI). We previously reported that heme-related molecules derived from hemolysis induced the production of reactive oxygen species from neutrophils. Recently, neutrophil extracellular traps (NETs) have been demonstrated to associate with the onset of TRALI.

Study Design and Methods

In this study, neutrophils' morphologic changes induced by the heme-related molecule hemin were confirmed to be NETs via confocal laser scanning microscopy and electron microscopy (EM). Additionally, concentrations of hemin in red blood cell (RBC) components were measured via enzyme-linked immunosorbent assay and possible contribution of these molecules to the onset of TRALI was discussed.

Results

SYTOX green staining observation via confocal laser scanning microscopy revealed that neutrophil morphology changed rapidly upon addition of hemin. The nuclei began to be enlarged and become segmented after 5 minutes, and NET-like structures were released from neutrophils after 15 minutes. In EM observation, NET-like structures appeared after 10 minutes and the nucleoplasm was partially separated from the nuclear membrane, which were consistent with the features of NET formation. These structures stained positively for both myeloperoxidase and histone H3 antibodies.

Conclusion

Thus, our results suggest that hemin induced NETs in 15 minutes, a quicker reaction than NET induction by phorbol myristate acetate requiring 3 hours. Moreover, since RBC components, especially those with long-term storage, contained sufficient hemin concentration to induce NETs, special attention to hemolysis of stored RBC components is important.

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