Reduced VIP Expression Affects Circadian Clock Function in VIP-IRES-CRE Mice (JAX 010908).

Reduced VIP Expression Affects Circadian Clock Function in VIP-IRES-CRE Mice (JAX 010908).
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DOI:
10.1177/0748730420925573
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发表时间:
2020-08
影响因子:
3.5
通讯作者:
Evans, Jennifer A.
Evans, Jennifer A.
中科院分区:
生物学3区
文献类型:
--
作者:
Joye, Deborah A. M.;Rohr, Kayla E.;Keller, Danielle;Inda, Thomas;Telega, Adam;Pancholi, Harshida;Carmona-Alcocer, Vania;Evans, Jennifer A.

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昼夜节律由视交叉上核 (SCN) 编程,它依靠神经肽信号传导来维持日常计时。血管活性肠多肽(VIP)对于 SCN 功能至关重要,但 VIP 神经元在 SCN 回路中的确切作用尚未完全确定。为了探究它们对 SCN 回路的贡献,可以使用 DNA 编辑酶 Cre 重组酶专门操纵 VIP 神经元。尽管 Cre 转基因被认为本身是惰性的,但我们发现杂合子和纯合子成年 VIP-IRES-Cre 小鼠 (JAX 010908) 中 VIP 表达均减少。与野生型小鼠相比,纯合 VIP-Cre 小鼠表现出更快的重新牵引和更短的自由奔跑时间,但在持续黑暗中不会出现心律失常。与这种表型一致,纯合 VIP-Cre 小鼠表现出完整的 SCN PER2∷LUC 节律,尽管周期和网络组织发生了改变。我们提供的证据表明,VIP-Cre SCN 维持分子节律的能力并不是由于残留的 VIP 信号传导;而是由于。相反,精氨酸加压素信号传导有助于维持该模型中细胞内和细胞间水平的 SCN 功能。这项工作证实 VIP-IRES-Cre 转基因会干扰 VIP 表达,但其他神经肽信号可以减轻 VIP 的损失,从而帮助维持 SCN 功能。我们的研究结果对采用这种转基因模型的研究具有重要意义,并为维持主时钟日常计时的神经肽信号提供了新的见解。
Circadian rhythms are programmed by the suprachiasmatic nucleus (SCN), which relies on neuropeptide signaling to maintain daily timekeeping. Vasoactive intestinal polypeptide (VIP) is critical for SCN function, but the precise role of VIP neurons in SCN circuits is not fully established. To interrogate their contribution to SCN circuits, VIP neurons can be manipulated specifically using the DNA-editing enzyme Cre recombinase. Although the Cre transgene is assumed to be inert by itself, we find that VIP expression is reduced in both heterozygous and homozygous adult VIP-IRES-Cre mice (JAX 010908). Compared with wild-type mice, homozygous VIP-Cre mice display faster reentrainment and shorter free-running period but do not become arrhythmic in constant darkness. Consistent with this phenotype, homozygous VIP-Cre mice display intact SCN PER2∷LUC rhythms, albeit with altered period and network organization. We present evidence that the ability to sustain molecular rhythms in the VIP-Cre SCN is not due to residual VIP signaling; rather, arginine vasopressin signaling helps to sustain SCN function at both intracellular and intercellular levels in this model. This work establishes that the VIP-IRES-Cre transgene interferes with VIP expression but that loss of VIP can be mitigated by other neuropeptide signals to help sustain SCN function. Our findings have implications for studies employing this transgenic model and provide novel insight into neuropeptide signals that sustain daily timekeeping in the master clock.
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