Microglial Acid Sensing Regulates Carbon Dioxide-Evoked Fear.

Microglial Acid Sensing Regulates Carbon Dioxide-Evoked Fear.
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DOI:
10.1016/j.biopsych.2016.04.022
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发表时间:
2016-10-01
影响因子:
10.6
通讯作者:
Sah, Renu
Sah, Renu
中科院分区:
医学1区
文献类型:
--
作者:
Vollmer, Lauren Larke;Ghosal, Sriparna;McGuire, Jennifer L.;Ahlbrand, Rebecca L.;Li, Ke-Yong;Santin, Joseph M.;Ratliff-Rang, Christine A.;Patrone, Luis G. A.;Rush, Jennifer;Lewkowich, Ian P.;Herman, James P.;Putnam, Robert W.;Sah, Renu

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Carbon dioxide (CO2) inhalation, a biological challenge and pathological marker in Panic Disorder, evokes intense fear and panic attacks in susceptible individuals. The molecular identity and anatomical location of CO2-sensing systems that translate CO2-evoked fear remains unclear. We investigated contributions of microglial acid sensor T cell death associated gene-8 (TDAG8) and microglial pro-inflammatory responses in CO2-evoked behavioral and physiological responses. CO2-evoked freezing, autonomic and respiratory responses were assessed in TDAG8-deficient (−/−) and wildtype (+/+) mice. Involvement of TDAG8-dependent microglial activation and pro-inflammatory cytokine IL-1β with CO2-evoked responses was investigated using microglial blocker, minocycline and IL-1β antagonist, IL- 1RA. CO2-chemosensitive firing responses using single-cell patch clamping were measured in TDAG8−/− and +/+ mice to gain functional insights. TDAG8 expression was localized in microglia enriched within the sensory circumventricular organs (CVOs). TDAG8−/− mice displayed attenuated CO2-evoked freezing and sympathetic responses. TDAG8 deficiency was associated with reduced microglial activation and pro-inflammatory cytokine, IL-1β within the subfornical organ (SFO). Central infusion of microglial activation blocker, minocycline and IL-1β antagonist, IL-1RA attenuated CO2-evoked freezing. Finally, CO2-evoked neuronal firing in patch clamped SFO neurons was dependent on acid sensor TDAG8 and IL-1β. Our data identify TDAG8-dependent microglial acid-sensing as a unique chemosensor for detecting and translating hypercapnia to fear-associated behavioral and physiological responses, providing a novel mechanism for homeostatic threat detection of relevance to psychiatric conditions such as panic disorder.
血管紧张素II在乳酸钠诱导的大鼠中的恐慌样反应中的作用,反复注射泌尿肌素1对基底外侧杏仁核:杏仁核血管紧张素受体和恐慌。
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