Insulin-like 3 affects zebrafish spermatogenic cells directly and via Sertoli cells

Diego Crespo, Luiz H.C. Assis, Yu Ting Zhang, Diego Safian, Tomasz Furmanek, Kai Ove Skaftnesmo, Birgitta Norberg, Wei Ge, Yung Ching Choi, Marjo J. den Broeder, Juliette Legler, Jan Bogerd, Rüdiger W. Schulz*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Pituitary hormones can use local signaling molecules to regulate target tissue functions. In adult zebrafish testes, follicle-stimulating hormone (Fsh) strongly increases the production of insulin-like 3 (Insl3), a Leydig cell-derived growth factor found in all vertebrates. Little information is available regarding Insl3 function in adult spermatogenesis. The Insl3 receptors Rxfp2a and 2b were expressed by type A spermatogonia and Sertoli and myoid cells, respectively, in zebrafish testis tissue. Loss of insl3 increased germ cell apoptosis in males starting at 9 months of age, but spermatogenesis appeared normal in fully fertile, younger adults. Insl3 changed the expression of 409 testicular genes. Among others, retinoic acid (RA) signaling was up- and peroxisome proliferator-activated receptor gamma (Pparg) signaling was down-regulated. Follow-up studies showed that RA and Pparg signaling mediated Insl3 effects, resulting in the increased production of differentiating spermatogonia. This suggests that Insl3 recruits two locally active nuclear receptor pathways to implement pituitary (Fsh) stimulation of spermatogenesis.

Original languageEnglish
Article number204
JournalCommunications Biology
Volume4
Issue number1
DOIs
Publication statusPublished - 15 Feb 2021

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