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An altered spinal serotonergic system contributes to increased thermal nociception in an animal model of depression

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Abstract

The olfactory bulbectomized (OB) rat, an animal model of chronic depression with comorbid anxiety, exhibits a profound dysregulation of the brain serotonergic signalling, a neurotransmission system involved in pain transmission and modulation. We here report an increased nociceptive response of OB rats in the tail flick test which is reverted after chronic, but not acute, administration of fluoxetine. Autoradiographic studies demonstrated down-regulation of 5-HT transporters ([3H]citalopram binding) and decreased functionality of 5-HT1A receptors (8-OH-DPAT-stimulated [35S]GTPγS binding) in the dorsal horn of the lumbar spinal cord in OB rats. Acute administration of fluoxetine (5–40 mg/kg i.p.) did not modify tail flick latencies in OB rats. However, chronic fluoxetine (10 mg/kg/day s.c., 14 days; osmotic minipumps) progressively attenuated OB-associated thermal hyperalgesia, and a total normalization of the nociceptive response was achieved at the end of the treatment with the antidepressant. In these animals, autoradiographic studies revealed further down-regulation of 5-HT transporters and normalization in the functionality of 5-HT1A receptors on the spinal cord. On the other hand, acute morphine (0.5–10 mg/kg s.c.) produced a similar analgesic effect in OB and sham and OB rats, and no changes were detected in the density ([3H]DAMGO binding) and functionality (DAMGO-stimulated [35S]GTPγS binding) of spinal μ-opioid receptors in OB rats before and after chronic fluoxetine. Our findings demonstrate the participation of the spinal serotonergic system in the increased thermal nociception exhibited by the OB rat and the antinociceptive effect of chronic fluoxetine in this animal model of depression.

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Acknowledgments

This work was supported by a grant from the Spanish Government (Ministerio de Ciencia y Tecnología, SAF-2004/00941 and SAF-2007/61862). AR-G was granted a pre-doctoral fellowship from Ministerio de Educación y Ciencia, and MLR was a pre-doctoral fellow from Fundación UPSA.

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Authors and Affiliations

  1. Departamento de Fisiología y Farmacología, Universidad de Cantabria, 39011, Santander, Cantabria, Spain

    Antonio Rodríguez-Gaztelumendi, María Luisa Rojo, Ángel Pazos & Álvaro Díaz

  2. Instituto de Biomedicina y Biotecnología de Cantabria IBBTEC (UC, CSIC, SODERCAN), 39011, Santander, Cantabria, Spain

    Antonio Rodríguez-Gaztelumendi, María Luisa Rojo, Ángel Pazos & Álvaro Díaz

  3. Centro de Investigación Biomédica en Red de Salud Mental (CIBERSAM), Instituto de Salud Carlos III, Madrid, Spain

    Antonio Rodríguez-Gaztelumendi, María Luisa Rojo, Ángel Pazos & Álvaro Díaz

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  1. Antonio Rodríguez-Gaztelumendi
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  2. María Luisa Rojo
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  3. Ángel Pazos
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Correspondence to Álvaro Díaz.

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Antonio Rodríguez-Gaztelumendi and María Luisa Rojo have contributed equally to this work.

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Rodríguez-Gaztelumendi, A., Rojo, M.L., Pazos, Á. et al. An altered spinal serotonergic system contributes to increased thermal nociception in an animal model of depression. Exp Brain Res 232, 1793–1803 (2014). https://doi.org/10.1007/s00221-014-3871-7

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