title: Brain hemodynamic response to somatosensory stimulation in Neuroligin-1 knockout mice.
abstract: Neuroligin 1 (NLGN1) is a postsynaptic adhesion molecule that determines N-methyl-d-aspartate receptor (NMDAR) function and cellular localization. Our recent work showed that Nlgn1 knockout (KO) mice cannot sustain neuronal activity occurring during wakefulness for a prolonged period of time. Since NMDAR-dependent neuronal activity drives an important vascular response, we used multispectral optical imaging to determine if the hemodynamic response to neuronal stimulation is modified in Nlgn1 KO mice. We observed that Nlgn1 KO mice show a 10% lower response rate to forepaw electrical stimulation compared to wild-type (WT) and heterozygote (HET) littermates on both the contra- and ipsilateral sides of the somatosensory cortex. Moreover, Nlgn1 mutant mice showed an earlier oxyhemoglobin peak response that tended to return to baseline faster than in WT mice. Analysis of the time course of the hemodynamic response also showed that HET mice express a faster dynamics of cerebrovascular response in comparison to WT. Taken together, these data are indicative of an altered immediate response of the brain to peripheral stimulation in Nlgn1 KO mice, and suggest a role for NLGN1 in the regulation of cerebrovascular responses.
authors.affiliation: Center for Advanced Research in Sleep Medicine, Hôpital du Sacré-Coeur de Montréal, Montreal, QC, H4J 1C5, Canada; Research Center, Hôpital du Sacré-Coeur de Montréal, Montreal, QC, H4J 1C5, Canada.
authors.forename: E
authors.initials: E
authors.lastname: Belanger-Nelson
authors.affiliation: Center for Advanced Research in Sleep Medicine, Hôpital du Sacré-Coeur de Montréal, Montreal, QC, H4J 1C5, Canada; Research Center, Hôpital du Sacré-Coeur de Montréal, Montreal, QC, H4J 1C5, Canada; Department of Neuroscience, Université de Montréal, Montreal, QC, H3C 3J7, Canada.
authors.forename: M
authors.initials: M
authors.lastname: Freyburger
authors.affiliation: Department of Electrical Engineering, École Polytechnique de Montréal and Research Center, Montreal Heart Institute, Montreal, QC, H1T 1C8, Canada.
authors.forename: P
authors.initials: P
authors.lastname: Pouliot
authors.affiliation: Research Center, Hôpital du Sacré-Coeur de Montréal, Montreal, QC, H4J 1C5, Canada.
authors.forename: E
authors.initials: E
authors.lastname: Beaumont
authors.affiliation: Department of Electrical Engineering, École Polytechnique de Montréal and Research Center, Montreal Heart Institute, Montreal, QC, H1T 1C8, Canada.
authors.forename: F
authors.initials: F
authors.lastname: Lesage
authors.affiliation: Center for Advanced Research in Sleep Medicine, Hôpital du Sacré-Coeur de Montréal, Montreal, QC, H4J 1C5, Canada; Research Center, Hôpital du Sacré-Coeur de Montréal, Montreal, QC, H4J 1C5, Canada; Department of Neuroscience, Université de Montréal, Montreal, QC, H3C 3J7, Canada. Electronic address: valerie.mongrain@umontreal.ca.
authors.forename: V
authors.initials: V
authors.lastname: Mongrain
mesh_terms: D000818:Animals; D015816:Cell Adhesion Molecules, Neuronal / Q000172:deficiency* / Q000235:genetics; D002560:Cerebrovascular Circulation / Q000502:physiology*; D004558:Electric Stimulation; D005552:Forelimb / Q000502:physiology; D006439:Hemodynamics / Q000502:physiology*; D008297:Male; D018345:Mice, Knockout; D018482:Muscle, Skeletal / Q000502:physiology; D061848:Optical Imaging; D010108:Oxyhemoglobins / Q000378:metabolism; D011434:Proprioception; D013003:Somatosensory Cortex / Q000098:blood supply / Q000503:physiopathology*; D013997:Time Factors
chemical_list: D015816:Cell Adhesion Molecules, Neuronal; D010108:Oxyhemoglobins; C093438:neuroligin 1
keywords: N-methyl-d-aspartate receptors; cerebrovascular response; multispectral intrinsic optical imaging; rodents; synaptic adhesion molecules