Glucagon-like peptide-1 analog, liraglutide, regulates Sertoli cell energy metabolism

in Journal of Endocrinology
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Marina Ercilia Dasso Centro de Investigaciones Endocrinológicas “Dr. César Bergadá” (CEDIE) – Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) – FEI – División de Endocrinología, Hospital de Niños Ricardo Gutiérrez, Buenos Aires, Argentina

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Cecilia Lucia Centola Centro de Investigaciones Endocrinológicas “Dr. César Bergadá” (CEDIE) – Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) – FEI – División de Endocrinología, Hospital de Niños Ricardo Gutiérrez, Buenos Aires, Argentina

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María Noel Galardo Centro de Investigaciones Endocrinológicas “Dr. César Bergadá” (CEDIE) – Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) – FEI – División de Endocrinología, Hospital de Niños Ricardo Gutiérrez, Buenos Aires, Argentina

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https://orcid.org/0000-0002-2678-622X
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Silvina Beatriz Meroni Centro de Investigaciones Endocrinológicas “Dr. César Bergadá” (CEDIE) – Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) – FEI – División de Endocrinología, Hospital de Niños Ricardo Gutiérrez, Buenos Aires, Argentina

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https://orcid.org/0000-0002-0313-7075
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María Fernanda Riera Centro de Investigaciones Endocrinológicas “Dr. César Bergadá” (CEDIE) – Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) – FEI – División de Endocrinología, Hospital de Niños Ricardo Gutiérrez, Buenos Aires, Argentina

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https://orcid.org/0000-0003-0762-1662

Correspondence should be addressed to M F Riera: friera@cedie.org.ar

This paper forms part of a special collection on Incretins. The guest editors for this collection were Timo Müller and Erin Mulvihill.

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Liraglutide, an analog of the incretin hormone glucagon-like peptide 1 (GLP-1), is widely used for obesity and type 2 diabetes treatment. However, there is scarce information about its effects on testicular function. Within the testis, Sertoli cells (SCs) provide nutritional support for germ cells; they metabolize glucose to lactate, which is delivered to germ cells to be used as a preferred energy substrate. Besides, SCs use fatty acids (FAs) as an energy source and store them as triacylglycerols (TAGs) within lipid droplets (LDs), which serve as an important energy reserve. In the present study, 20-day-old rat SC cultures were used to assess whether liraglutide affects their metabolic functions related to nutritional support and lipid storage. The results show that liraglutide does not modify glucose consumption or lactate production. However, it increases TAG levels and LD content. These effects are accompanied by an increase in the mRNA levels of the fatty acid transporter FAT/CD36, glycerol-3-phosphate-acyltransferase 3, and perilipins 1 and 4. The participation of the cAMP/PKA signaling pathway was explored. We observed that H89 (a PKA inhibitor) decreases the LD upregulation elicited by liraglutide, and that dibutyryl cAMP increases LD content and the expression of related genes. In summary, liraglutide promotes lipid storage in SCs through the regulation of key regulatory genes involved in FA transport, TAG synthesis, and LD formation. Considering the importance of lipid storage in SC energetic homeostasis maintenance, we postulate that liraglutide might improve the overall energetic status of the seminiferous tubule.

 

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