Abstract
Patients suffering of amyotrophic lateral sclerosis (ALS) present motoneuron degeneration leading to muscle atrophy, dysphagia, and dysarthria. The Wobbler mouse, an animal model of ALS, shows a selective loss of motoneurons, astrocytosis, and microgliosis in the spinal cord. The incidence of ALS is greater in men; however, it increases in women after menopause, suggesting a role of sex steroids in ALS. Testosterone is a complex steroid that exerts its effects directly via androgen (AR) or Sigma-1 receptors and indirectly via estrogen receptors (ER) after aromatization into estradiol. Its reduced-metabolite 5α-dihydrotestosterone acts via AR. This study analyzed the effects of testosterone in male symptomatic Wobblers. Controls or Wobblers received empty or testosterone-filled silastic tubes for 2 months. The cervical spinal cord from testosterone-treated Wobblers showed (1) similar androgen levels to untreated control and (2) increased levels of testosterone, and its 5α-reduced metabolites, 5α- dihydrotestosterone, and 3β-androstanediol, but (3) undetectable levels of estradiol compared to untreated Wobblers. Testosterone-treated controls showed comparable steroid concentrations to its untreated counterpart. In testosterone- treated Wobblers a reduction of AR, ERα, and aromatase and high levels of Sigma-1 receptor mRNAs was demonstrated. Testosterone treatment increased ChAT immunoreactivity and the antiinflammatory mediator TGFβ, while it lessened vacuolated motoneurons, GFAP+ astrogliosis, the density of IBA1+ microgliosis, proinflammatory mediators, and oxidative/nitrosative stress. Clinically, testosterone treatment in Wobblers slowed the progression of paw atrophy and improved rotarod performance. Collectively, our findings indicate an antiinflammatory and protective effect of testosterone in the degenerating spinal cord. These results coincided with a high concentration of androgen-reduced derivatives after testosterone treatment suggesting that the steroid profile may have a beneficial role on disease progression.
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Data Availability
The data supporting the results of this investigation are available from the corresponding author upon request.
Abbreviations
- ALS:
-
Amyotrophic lateral sclerosis
- AR:
-
Androgen receptor
- CAIS:
-
Complete androgen insensitivity syndrome
- ChAT:
-
Choline acetyltransferase
- ER:
-
Estrogen receptor
- FSH:
-
Follicle stimulating hormone
- GFAP:
-
Glial fibrillary acidic protein
- GnRH:
-
Gonadotropin-releasing hormone
- HPG:
-
Hypothalamic–pituitary–gonadal axis
- IBA1:
-
Ionized calcium–binding adaptor molecule 1
- LH:
-
Luteinizing hormone
- MAM:
-
Mitochondrion-associated endoplasmic reticulum membrane
- NADPH-d:
-
NADPH diaphorase
- NOS:
-
Nitric oxide synthase
- PAIS:
-
Partial androgen insensitivity syndrome
- SBMA:
-
Spinal and bulbar muscular atrophy
- TGF β1 :
-
Transforming growth factor-beta1
- 3-NT:
-
3-Nitrotyrosine
- 3βHSOR:
-
3β-Hydroxysteroid oxidoreductase
- 3α-HSD:
-
3α-Hydroxysteroid dehydrogenase
- 5α-DHT:
-
5α-Dihydrotestosterone
- 17β-HSD:
-
17β-Hydroxysteroid dehydrogenase
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The authors kindly acknowledge the laboratory assistance of Mrs. Analia Lima and Paulina Roig.
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We thank the financial support of the National Research Council of Argentina [CONICET, PIP 2017-2019 #11220170100002CO and PIP 2017-2019 #11220170100301CO], the Ministry of Health and Technology of Argentina (PICT 2017 No. 1150), Roemmers, René Barón and Williams Foundations, and the University of Buenos Aires [Ubacyt # 20020170100224BA]. Agustina Lara was the recipient of a Salvador Mazza Fellowship from the Faculty of Medicine, UBA (2015-2018).
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Lara A., Esperante I and Meyer M carried out the experiments. Philippe L. performed steroid determination by gas chromatography and mass spectrometry (GC/MS). Di Giorgio N carried out FSH and LH determination. Gonzalez Deniselle MC planned and supervised the experiments. Guennoun R. supervised GC/MS experiments. Gargiulo-Monachelli G helped in the supervision of experiments. Schumacher M. contributed with the testosterone silastic preparation. Gonzalez Deniselle MC, Gargiulo-Monachelli G, De Nicola AF, Schumacher M and Guennoun R. contributed to discuss the project and interpretation of results. Gonzalez Deniselle MC wrote the manuscript with the support from De Nicola AF and Guennoun R. All authors discussed the results.
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Lara, A., Esperante, I., Meyer, M. et al. Neuroprotective Effects of Testosterone in Male Wobbler Mouse, a Model of Amyotrophic Lateral Sclerosis. Mol Neurobiol 58, 2088–2106 (2021). https://doi.org/10.1007/s12035-020-02209-5
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DOI: https://doi.org/10.1007/s12035-020-02209-5