中文摘要：

以前的研究表明神經元引導分子 netrin-1 有助于減輕心肌缺血再灌注損傷。然而，組織特異性來源和受體信號轉導事件仍然難以捉摸。中性粒細胞是最早對缺血性損傷做出反應的細胞之一，可能與組織損傷或救援有關。我們發現心肌梗死患者血液中 netrin-1 水平升高，以及暴露于心肌缺血再灌注的小鼠。在 Ntn1loxP/loxP Lyz2 Cre+ 小鼠中發現選擇性增加的梗死面積和肌鈣蛋白水平，但在其他組織區室中條件性 netrin-1 缺失的小鼠中沒有發現。使用中性粒細胞耗竭的體內研究確定，中性粒細胞是心肌損傷期間血液 netrin-1 升高的主要來源。最后，使用重組 netrin-1 治療的藥理學研究揭示了通過髓樣腺苷 A2b 受體的嘌呤能信號事件在介導 netrin-1 誘導的心臟保護中的功能作用。這些發現表明，中性粒細胞來源的 netrin-1 在通過髓系腺苷 A2b 信號傳導減輕心肌缺血再灌注損傷中具有功能作用的自分泌信號回路。

英文摘要：

Previous studies implicated the neuronal guidance molecule netrin-1 in attenuating myocardial ischemia-reperfusion injury. However, the tissue-specific sources and receptor signaling events remain elusive. Neutrophils are among the first cells responding to an ischemic insult and can be associated with tissue injury or rescue. We found netrin-1 levels were elevated in the blood of patients with myocardial infarction, as well as in mice exposed to myocardial ischemia-reperfusion. Selectively increased infarct sizes and troponin levels were found in Ntn1loxP/loxP Lyz2 Cre+ mice, but not in mice with conditional netrin-1 deletion in other tissue compartments. In vivo studies using neutrophil depletion identified neutrophils as the main source for elevated blood netrin-1 during myocardial injury. Finally, pharmacologic studies using treatment with recombinant netrin-1 revealed a functional role for purinergic signaling events through the myeloid adenosine A2b receptor in mediating netrin-1–elicited cardioprotection. These findings suggest an autocrine signaling loop with a functional role for neutrophil-derived netrin-1 in attenuating myocardial ischemia-reperfusion injury through myeloid adenosine A2b signaling.

論文信息：

論文題目： PMN-derived netrin-1 attenuates cardiac ischemia-reperfusion injury via myeloid ADORA2B signaling

期刊名稱：JEM- J Exp Med

時間期卷：J Exp Med (2021) 218 (6): e20210008.

在線時間：2021年4月23日

DOI：  //doi.org/10.1084/jem.20210008

Liposoma巨噬細胞清除劑Clodronate Liposomes見刊于JEM：

Liposoma巨噬細胞清除劑Clodronate Liposomes氯膦酸二鈉脂質體的材料和方法：

JEM期刊缺血再灌注模型外周血單核巨噬細胞清除解決方案

Monocyte and macrophage depletion