A specialized reciprocal connectivity suggests a link between the mechanisms by which the superior colliculus and parabigeminal nucleus produce defensive behaviors in rodents

A. Deichler, D. Carrasco, L. Lopez-Jury, T.A. Vega Zuniga, N. Marquez, J. Mpodozis, G. Marin, Scientific Reports 10 (2020).

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Deichler, Alfonso; Carrasco, Denisse; Lopez-Jury, Luciana; Vega Zuniga, Tomas AIST Austria; Marquez, Natalia; Mpodozis, Jorge; Marin, Gonzalo
Department
Abstract
The parabigeminal nucleus (PBG) is the mammalian homologue to the isthmic complex of other vertebrates. Optogenetic stimulation of the PBG induces freezing and escape in mice, a result thought to be caused by a PBG projection to the central nucleus of the amygdala. However, the isthmic complex, including the PBG, has been classically considered satellite nuclei of the Superior Colliculus (SC), which upon stimulation of its medial part also triggers fear and avoidance reactions. As the PBG-SC connectivity is not well characterized, we investigated whether the topology of the PBG projection to the SC could be related to the behavioral consequences of PBG stimulation. To that end, we performed immunohistochemistry, in situ hybridization and neural tracer injections in the SC and PBG in a diurnal rodent, the Octodon degus. We found that all PBG neurons expressed both glutamatergic and cholinergic markers and were distributed in clearly defined anterior (aPBG) and posterior (pPBG) subdivisions. The pPBG is connected reciprocally and topographically to the ipsilateral SC, whereas the aPBG receives afferent axons from the ipsilateral SC and projected exclusively to the contralateral SC. This contralateral projection forms a dense field of terminals that is restricted to the medial SC, in correspondence with the SC representation of the aerial binocular field which, we also found, in O. degus prompted escape reactions upon looming stimulation. Therefore, this specialized topography allows binocular interactions in the SC region controlling responses to aerial predators, suggesting a link between the mechanisms by which the SC and PBG produce defensive behaviors.
Publishing Year
Date Published
2020-10-01
Journal Title
Scientific Reports
Acknowledgement
We thank Elisa Sentis and Solano Henriquez for their expert technical assistance. Dr. David Sterratt for his helpful advice in using the Retistruct package. Dr. Joao Botelho for his valuable assistance in scanning the retinas. To Mrs. Diane Greenstein for kindly reading and correcting our manuscript. Macarena Ruiz for her helpful comments during figures elaboration. Dr. Alexia Nunez-Parra for kindly providing us with the transgenic mouse line. Dr. Harald Luksch for granting us access to the confocal microscope at his lab. This study was supported by: FONDECYT 1151432 (to G.M.), FONDECYT 1170027 (to J.M.) and Doctoral fellowship CONICYT 21161599 (to A.D.).
Volume
10
Article Number
16220
eISSN
IST-REx-ID

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Deichler A, Carrasco D, Lopez-Jury L, et al. A specialized reciprocal connectivity suggests a link between the mechanisms by which the superior colliculus and parabigeminal nucleus produce defensive behaviors in rodents. Scientific Reports. 2020;10. doi:10.1038/s41598-020-72848-0
Deichler, A., Carrasco, D., Lopez-Jury, L., Vega Zuniga, T. A., Marquez, N., Mpodozis, J., & Marin, G. (2020). A specialized reciprocal connectivity suggests a link between the mechanisms by which the superior colliculus and parabigeminal nucleus produce defensive behaviors in rodents. Scientific Reports, 10. https://doi.org/10.1038/s41598-020-72848-0
Deichler, Alfonso, Denisse Carrasco, Luciana Lopez-Jury, Tomas A Vega Zuniga, Natalia Marquez, Jorge Mpodozis, and Gonzalo Marin. “A Specialized Reciprocal Connectivity Suggests a Link between the Mechanisms by Which the Superior Colliculus and Parabigeminal Nucleus Produce Defensive Behaviors in Rodents.” Scientific Reports 10 (2020). https://doi.org/10.1038/s41598-020-72848-0.
A. Deichler et al., “A specialized reciprocal connectivity suggests a link between the mechanisms by which the superior colliculus and parabigeminal nucleus produce defensive behaviors in rodents,” Scientific Reports, vol. 10, 2020.
Deichler A, Carrasco D, Lopez-Jury L, Vega Zuniga TA, Marquez N, Mpodozis J, Marin G. 2020. A specialized reciprocal connectivity suggests a link between the mechanisms by which the superior colliculus and parabigeminal nucleus produce defensive behaviors in rodents. Scientific Reports. 10.
Deichler, Alfonso, et al. “A Specialized Reciprocal Connectivity Suggests a Link between the Mechanisms by Which the Superior Colliculus and Parabigeminal Nucleus Produce Defensive Behaviors in Rodents.” Scientific Reports, vol. 10, 16220, Springer Nature, 2020, doi:10.1038/s41598-020-72848-0.
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