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Changes in the endocannabinoid signaling system in CNS structures of TDP-43 transgenic mice: relevance for a neuroprotective therapy in TDP-43-related disorders

Journal of Neuroimmune Pharmacology volume 10, pages 233–244 (2015)Cite this article

Abstract

Because of their neuroprotective properties, cannabinoids are being investigated in neurodegenerative disorders, mainly in preclinical studies. These disorders also include amyotrophic lateral sclerosis (ALS), a degenerative disease produced by the damage of the upper and lower motor neurons leading to muscle denervation, atrophy and paralysis. The studies with cannabinoids in ALS have been conducted exclusively in a transgenic mouse model bearing mutated forms of human superoxide dismutase-1, the first gene that was identified in relation with ALS. The present study represents the first attempt to investigate the endocannabinoid system in an alternative model, the transgenic mouse model of TAR-DNA binding protein-43 (TDP-43), a protein related to ALS and also to frontotemporal dementia. We used these mice for behavioral and histological characterization at an early symptomatic phase (70–80 days of age) and at a post-symptomatic stage (100–110 days of age). TDP-43 transgenic mice exhibited a worsened rotarod performance at both disease stages. This was accompanied by a loss of motor neurons in the spinal cord (measured by Nissl staining) and by reactive microgliosis (measured by Iba-1 immunostaining) at the post-symptomatic stage. We also detected elevated levels of the CB2 receptor (measured by qRT-PCR and western blotting) in the spinal cord of these animals. Double-staining studies confirmed that this up-regulation occurs in microglial cells in the post-symptomatic stage. Some trends towards an increase were noted also for the levels of endocannabinoids, which in part correlate with a small reduction of FAAH. Some of these parameters were also analyzed in the cerebral cortex of TDP-43 transgenic mice, but we did not observe any significant change, in agreement with the absence of anomalies in cognitive tests. In conclusion, our data support the idea that the endocannabinoid signaling system, in particular the CB2 receptor, may serve for the development of a neuroprotective therapy in TDP-43-related disorders. We are presently engaged in pharmacological experiments to investigate this possibility.

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Acknowledgements

This work has been supported by grants from CIBERNED (CB06/05/0089), MINECO (SAF2012/39173), CAM (S2011/BMD-2308), Alzheimer’s Association USA and GW Pharmaceuticals Ltd. These agencies had no further role in study design, the collection, analysis and interpretation of data, in the writing of the report, or in the decision to submit the paper for publication. Francisco Espejo-Porras is a predoctoral fellow supported by the MINECO (FPI Programme). Authors are indebted to Yolanda García-Movellán for administrative assistance.

Disclosure of Potential Conflicts of Interest

The authors declare that they have no conflicts of interest.

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Authors and Affiliations

  1. Instituto Universitario de Investigación en Neuroquímica, Departamento de Bioquímica y Biología Molecular III, Facultad de Medicina, Universidad Complutense, Madrid, 28040, Spain

    Francisco Espejo-Porras, José A. Ramos, Eva de Lago & Javier Fernández-Ruiz

  2. Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), Madrid, Spain

    Francisco Espejo-Porras, José A. Ramos, Eva de Lago & Javier Fernández-Ruiz

  3. Instituto Ramón y Cajal de Investigación Sanitaria (IRYCIS), Madrid, Spain

    Francisco Espejo-Porras, José A. Ramos, Eva de Lago & Javier Fernández-Ruiz

  4. Endocannabinoid Research Group, Institute of Biomolecular Chemistry, Consiglio Nazionale delle Ricerche, Pozzuoli, Naples, Italy

    Fabiana Piscitelli, Roberta Verde & Vincenzo Di Marzo

Authors
  1. Francisco Espejo-Porras
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  2. Fabiana Piscitelli
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  3. Roberta Verde
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  4. José A. Ramos
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  5. Vincenzo Di Marzo
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  6. Eva de Lago
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  7. Javier Fernández-Ruiz
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Corresponding authors

Correspondence to Eva de Lago or Javier Fernández-Ruiz.

Additional information

Eva de Lago and Javier Fernández-Ruiz shared the senior authorship of this study.

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Figure S1

Representative blots for CB2 receptors and FAAH, always corresponding to tissues from females. Bottom panels are the total protein bands transferred to a PVCF membrane that were used as loading controls. (PPTX 3947 kb)

Figure S2

Behavioral recording in the Water Morris test of TDP-43 transgenic and wild-type male mice at the postsymptomatic (100-110 days after birth) stage. Values are means ± SEM for 6-8 animals per group. Data were assessed by the unpaired Student’s t-test. (PPTX 73 kb)

Figure S3

Immunofluorescence for CB2 receptors (magnification was 40x) showing a complete loss of immunostaining in the spinal cord of CB2 receptor-knockout mice when compared with the signal found in wild-type mice and, in particular, TDP-43 transgenic mice at the postsymptomatic (100-110 days after birth) stage. Immunostainings were repeated in at least 3 animals per group. (PPTX 241 kb)

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Espejo-Porras, F., Piscitelli, F., Verde, R. et al. Changes in the endocannabinoid signaling system in CNS structures of TDP-43 transgenic mice: relevance for a neuroprotective therapy in TDP-43-related disorders. J Neuroimmune Pharmacol 10, 233–244 (2015). https://doi.org/10.1007/s11481-015-9602-4

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  • DOI: https://doi.org/10.1007/s11481-015-9602-4

Keywords

  • Cannabinoids
  • CB1 and CB2 receptors
  • Endocannabinoid enzymes
  • Amyotrophic lateral sclerosis
  • TDP-43 transgenic mice
  • Spinal cord