Mapping of kisspeptin fibres in the brain of the pro-oestrous rat.

Animals; Brain/anatomy & histology/metabolism; Brain Mapping; Female; Humans; Immunohistochemistry; Kisspeptins; Nerve Fibers/metabolism/ultrastructure; Neurons/cytology/metabolism; Proestrus; Protein Isoforms/metabolism; Proteins/metabolism; Rats; Rats, Wistar; Tissue Distribution

Abstract :

[en] Kisspeptins are a family of small peptides that play a key role in the neuroendocrine regulation of the reproductive function through neural pathways that have not yet been completely identified. The present study aimed to investigate the distribution of kisspeptin neurone fibres in the female rat brain by comparing precisely the immunoreactive pattern obtained with two antibodies: one specifically directed against kisspeptin-52 (Kp-52), the longest isoform, and the other directed against kisspeptin-10 (Kp-10), whose sequence is common to all putative mature isoforms. With both antibodies, immunoreactive cell bodies were exclusively observed in the arcuate nucleus, and immunoreactive fibres were confined to the septo-preoptico-hypothalamic continuum of the brain. Fibres were observed in the preoptic area, the diagonal band of Broca, the septohypothalamic area, the anteroventral periventricular, suprachiasmatic, supraoptic, paraventricular and periventricular nuclei, the dorsal border of the ventromedian nucleus, the dorsomedial and arcuate nuclei, and the median eminence. In the latter structure, varicose fibres were mainly distributed in the internal layer and were detected to a lesser extent throughout the external layer, including around the deeper part of the infundibular recess. Most regions of immunoreactive cells and fibres matched perfectly for the two antibodies. However, fibres in the dorsolateral septum, anterior fornix, accumbens nucleus and the lateral bed nucleus of the stria terminalis were only recognised by antibody anti-Kp-10, suggesting that anti-Kp-10 may recognise a wider range of kisspeptin isoforms than anti-Kp-52 or cross-react with molecules other than kisspeptin in rat tissue. Overall, these results illustrate the variety of projection sites of kisspeptin neurones in the rat and suggest that these peptides play a role in different functions.

Disciplines :

Anatomy (cytology, histology, embryology...) & physiology

Author, co-author :

Desroziers, Elodie ; Université de Tours > INRA-Physiologie de la reproduction et des comportements

Mikkelsen, J.

Simonneaux, V.

Keller, M.

Tillet, Y.

Caraty, A.

Franceschini, I.

Language :

English

Title :

Mapping of kisspeptin fibres in the brain of the pro-oestrous rat.

Publication date :

2010

Journal title :

Journal of Neuroendocrinology

ISSN :

0953-8194

eISSN :

1365-2826

Publisher :

Wiley, Malden, United States - Massachusetts

Volume :

Issue :

Pages :

1101-12

Peer reviewed :

Peer Reviewed verified by ORBi

Commentary :

Available on ORBi :

since 20 March 2013

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