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  • 1.
    Athanassiadis, Tuija
    et al.
    Umeå University, Faculty of Medicine, Department of Integrative Medical Biology (IMB), Physiology.
    Olsson, Kurt A
    Umeå University, Faculty of Medicine, Department of Integrative Medical Biology (IMB), Physiology.
    Kolta, A
    Westberg, Karl-Gunnar
    Umeå University, Faculty of Medicine, Department of Integrative Medical Biology (IMB), Physiology.
    Identification of c-Fos immunoreactive brainstem neurons activated during fictive mastication in the rabbit2005In: Experimental Brain Research, ISSN 0014-4819, E-ISSN 1432-1106, Vol. 165, no 4, p. 478-489Article in journal (Refereed)
    Abstract [en]

    In the present study we used the expression of the c-Fos-like protein as a "functional marker" to map populations of brainstem neurons involved in the generation of mastication. Experiments were conducted on urethane-anesthetized and paralyzed rabbits. In five animals (experimental group), rhythmical bouts of fictive masticatory-like motoneuron activity (cumulative duration 60-130 min) were induced by electrical stimulation of the left cortical "masticatory area" and recorded from the right digastric motoneuron pool. A control group of five animals (non-masticatory) were treated in the same way as the experimental animals with regard to surgical procedures, anesthesia, paralysis, and survival time. To detect the c-Fos-like protein, the animals were perfused, and the brainstems were cryosectioned and processed immunocytochemically. In the experimental group, the number of c-Fos-like immunoreactive neurons increased significantly in several brainstem areas. In rostral and lateral areas, increments occurred bilaterally in the borderzones surrounding the trigeminal motor nucleus (Regio h); the rostrodorsomedial half of the trigeminal main sensory nucleus; subnucleus oralis-gamma of the spinal trigeminal tract; nuclei reticularis parvocellularis pars alpha and nucleus reticularis pontis caudalis (RPc) pars alpha. Further caudally-enhanced labeling occurred bilaterally in nucleus reticularis parvocellularis and nucleus reticularis gigantocellularis (Rgc) including its pars-alpha. Our results provide a detailed anatomical record of neuronal populations that are correlated with the generation of the masticatory motor behavior.

  • 2.
    Athanassiadis, Tuija
    et al.
    Umeå University, Faculty of Medicine, Department of Integrative Medical Biology (IMB), Physiology.
    Westberg, Karl-Gunnar
    Umeå University, Faculty of Medicine, Department of Integrative Medical Biology (IMB), Physiology.
    Olsson, Kurt A
    Umeå University, Faculty of Medicine, Department of Integrative Medical Biology (IMB), Physiology.
    Kolta, A
    Physiological characterization, localization and synaptic inputs of bursting and nonbursting neurons in the trigeminal principal sensory nucleus of the rat2005In: European Journal of Neuroscience, ISSN 0953-816X, E-ISSN 1460-9568, Vol. 22, no 12, p. 3099-3110Article in journal (Refereed)
    Abstract [en]

    A population of neurons in the trigeminal principal sensory nucleus (NVsnpr) fire rhythmically during fictive mastication induced in the in vivo rabbit. To elucidate whether these neurons form part of the central pattern generator (CPG) for mastication, we performed intracellular recordings in brainstem slices taken from young rats. Two cell types were defined, nonbursting (63%) and bursting (37%). In response to membrane depolarization, bursting cells, which dominated in the dorsal part of the NVsnpr, fired an initial burst followed by single spikes or recurring bursts. Non-bursting neurons, scattered throughout the nucleus, fired single action potentials. Microstimulation applied to the trigeminal motor nucleus (NVmt), the reticular border zone surrounding the NVmt, the parvocellular reticular formation or the nucleus reticularis pontis caudalis (NPontc) elicited a postsynaptic potential in 81% of the neurons tested for synaptic inputs. Responses obtained were predominately excitatory and sensitive to glutamatergic antagonists DNQX and/or APV. Some inhibitory and biphasic responses were also evoked. Bicuculline methiodide or strychnine blocked the IPSPs indicating that they were mediated by GABA(A) or glycinergic receptors. About one-third of the stimulations activated both types of neurons antidromically, mostly from the masseteric motoneuron pool of NVmt and dorsal part of NPontc. In conclusion, our new findings show that some neurons in the dorsal NVsnpr display both firing properties and axonal connections which support the hypothesis that they may participate in masticatory pattern generation. Thus, the present data provide an extended basis for further studies on the organization of the masticatory CPG network.

  • 3.
    Lund, James P
    et al.
    Faculty of Dentistry, McGill University, Montréal, Québec, Canada .
    Sadeghi, Somayeh
    Faculty of Dentistry, McGill University, Montréal, Québec, Canada .
    Athanassiadis, Tuija
    Umeå University, Faculty of Medicine, Department of Integrative Medical Biology (IMB), Physiology.
    Caram Salas, Nadia
    Faculty of Dentistry, McGill University, Montréal, Québec, Canada .
    Auclair, François
    Groupe de Recherche sur le Système Nerveux Central du FRSQ, Département de Physiologie, Faculté de Médecine, Université de Montréal, Montréal, Québec, Canada .
    Thiverge, Benoît
    Faculté de Médecine Dentaire, Université de Montréal, Montréal, Québec, Canada.
    Arsenault, Isabel
    Groupe de Recherche sur le Système Nerveux Central du FRSQ, Département de Physiologie, Faculté de Médecine, Université de Montréal, Montréal, Québec, Canada.
    Rompré, Pierre
    Faculté de Médecine Dentaire, Université de Montréal, Montréal, Québec, Canada.
    Westberg, Karl-Gunnar
    Umeå University, Faculty of Medicine, Department of Integrative Medical Biology (IMB), Physiology.
    Kolta, Arlette
    Groupe de Recherche sur le Système Nerveux Central du FRSQ, Département de Physiologie, Faculté de Médecine, Université de Montréal, Montréal, Québec, Canada .
    Evidence that muscle spindle mechanoreceptor afferents play a role in chronic muscle painManuscript (preprint) (Other academic)
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