异质的单调和非单调的气味响应在小鼠嗅觉球的 mitra / tufted 球粒
Narayan Subramanian1, David Wharton2, Bhargav Karamched3,4,2
1Department of Biological Science, Florida State University, Tallahassee, FL.
bioRxiv : the preprint server for biology
|March 17, 2025
概括
嗅觉球中的嗅觉处理涉及复杂的抑制电路. 新的模型揭示了淋巴细胞中非单调的反应,解释了如何检测到气味度变化.
科学领域:
- 神经科学是一个神经科学.
- 计算神经科学是一种神经科学.
- 感官处理 感官处理
背景情况:
- 嗅觉灯泡 (OB) 模型表明,细胞内和细胞间抑制塑造了感官输入.
- 这些抑制电路对不同嗅觉受体神经元 (ORN) 输入的确切影响尚未完全理解.
研究的目的:
- 模拟嗅觉灯泡的输入输出转换,专注于抑制电路的作用.
- 调查内抑制和内正常化如何影响内输出和度-反应关系.
主要方法:
- 开发了OB输入-输出转换的计算模型,包括ORN输入,细胞内抑制和细胞内正常化.
- 分析模型输出以对度-反应关系进行分类 (单调I/D,非单调DI/ID).
- 在醒着的小鼠中使用*in vivo*2光子Ca2+成像验证的模型预测.
主要成果:
- 模型输出显示了线性和非线性度-反应关系,这取决于ORN属性.
- 确定了四个响应类别:单调增加 (I),单调减少 (D),非单调减少然后增加 (DI),以及非单调增加然后减少 (ID).
- 不单调的ID反应,需要细胞间抑制,在更高亲和度的ORN输入中普遍存在,并在小鼠MTC质体中实验观察到,近一半显示ID特征.
结论:
- 对气味度变化的非线性反应在嗅球中是典型的,并不罕见.
- 细胞内和细胞间抑制是解释这些复杂,非单调的嗅觉反应的关键机制.
- 淋巴细胞敏感度与非单调度相关,为嗅觉编码提供了洞察力.
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