Invertebrate Gonadotropin-Releasing Hormone-Related Peptides and Their Receptors: An Update
Gonadotropin-releasing hormones (GnRHs) play pivotal roles in reproductive functions via the hypothalamus, pituitary, and gonad axis, namely, HPG axis in vertebrates. GnRHs and their receptors (GnRHRs) are likely to be conserved in invertebrate deuterostomes and lophotrochozoans. All vertebrate and...
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Frontiers Media S.A.
2017-09-01
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author | Tsubasa Sakai Akira Shiraishi Tsuyoshi Kawada Shin Matsubara Masato Aoyama Honoo Satake |
author_facet | Tsubasa Sakai Akira Shiraishi Tsuyoshi Kawada Shin Matsubara Masato Aoyama Honoo Satake |
author_sort | Tsubasa Sakai |
collection | DOAJ |
description | Gonadotropin-releasing hormones (GnRHs) play pivotal roles in reproductive functions via the hypothalamus, pituitary, and gonad axis, namely, HPG axis in vertebrates. GnRHs and their receptors (GnRHRs) are likely to be conserved in invertebrate deuterostomes and lophotrochozoans. All vertebrate and urochordate GnRHs are composed of 10 amino acids, whereas protostome, echinoderm, and amphioxus GnRH-like peptides are 11- or 12-residue peptide containing two amino acids after an N-terminal pyro-Glu. In urochordates, Halocynthia roretzi GnRH gene encodes two GnRH peptide sequences, whereas two GnRH genes encode three different GnRH peptides in Ciona intestinalis. These findings indicate the species-specific diversification of GnRHs. Intriguingly, the major signaling pathway for GnRHRs is intracellular Ca2+ mobilization in chordates, echinoderms, and protostomes, whereas Ciona GnRHRs (Ci-GnRHRs) are endowed with multiple GnRHergic cAMP production pathways in a ligand-selective manner. Moreover, the ligand-specific modulation of signal transduction via heterodimerization among Ci-GnRHR paralogs suggests the species-specific development of fine-tuning of gonadal functions in ascidians. Echinoderm GnRH-like peptides show high sequence differences compared to those of protostome counterparts, leading to the difficulty in classification of peptides and receptors. These findings also show both the diversity and conservation of GnRH signaling systems in invertebrates. The lack of the HPG axis in invertebrates indicates that biological functions of GnRHs are not release of gonadotropins in current invertebrates and common ancestors of vertebrates and invertebrates. To date, authentic or putative GnRHRs have been characterized from various echinoderms and protostomes as well as chordates and the mRNAs have been found to be distributed not only reproductive organs but also other tissues. Collectively, these findings further support the notion that invertebrate GnRHs have biological roles other than the regulation of reproductive functions. Moreover, recent molecular phylogenetic analysis suggests that adipokinetic hormone (AKH), corazonin (CRZ), and AKH/CRZ-related peptide (ACP) belong to the GnRH superfamily but has led to the different classifications of these peptides and receptors using different datasets including the number of sequences and structural domains. In this review, we provide current knowledge of, and perspectives in, molecular basis and evolutionary aspects of the GnRH, AKH, CRZ, and ACP. |
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language | English |
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spelling | doaj.art-395944b878cb43c3810da225e2e5896f2022-12-21T17:31:19ZengFrontiers Media S.A.Frontiers in Endocrinology1664-23922017-09-01810.3389/fendo.2017.00217289129Invertebrate Gonadotropin-Releasing Hormone-Related Peptides and Their Receptors: An UpdateTsubasa Sakai0Akira Shiraishi1Tsuyoshi Kawada2Shin Matsubara3Masato Aoyama4Honoo Satake5Bioorganic Research Institute, Suntory Foundation for Life Sciences, Kyoto, JapanBioorganic Research Institute, Suntory Foundation for Life Sciences, Kyoto, JapanBioorganic Research Institute, Suntory Foundation for Life Sciences, Kyoto, JapanBioorganic Research Institute, Suntory Foundation for Life Sciences, Kyoto, JapanFaculty of Science, Department of Biological Sciences, Nara Women’s University, Nara, JapanBioorganic Research Institute, Suntory Foundation for Life Sciences, Kyoto, JapanGonadotropin-releasing hormones (GnRHs) play pivotal roles in reproductive functions via the hypothalamus, pituitary, and gonad axis, namely, HPG axis in vertebrates. GnRHs and their receptors (GnRHRs) are likely to be conserved in invertebrate deuterostomes and lophotrochozoans. All vertebrate and urochordate GnRHs are composed of 10 amino acids, whereas protostome, echinoderm, and amphioxus GnRH-like peptides are 11- or 12-residue peptide containing two amino acids after an N-terminal pyro-Glu. In urochordates, Halocynthia roretzi GnRH gene encodes two GnRH peptide sequences, whereas two GnRH genes encode three different GnRH peptides in Ciona intestinalis. These findings indicate the species-specific diversification of GnRHs. Intriguingly, the major signaling pathway for GnRHRs is intracellular Ca2+ mobilization in chordates, echinoderms, and protostomes, whereas Ciona GnRHRs (Ci-GnRHRs) are endowed with multiple GnRHergic cAMP production pathways in a ligand-selective manner. Moreover, the ligand-specific modulation of signal transduction via heterodimerization among Ci-GnRHR paralogs suggests the species-specific development of fine-tuning of gonadal functions in ascidians. Echinoderm GnRH-like peptides show high sequence differences compared to those of protostome counterparts, leading to the difficulty in classification of peptides and receptors. These findings also show both the diversity and conservation of GnRH signaling systems in invertebrates. The lack of the HPG axis in invertebrates indicates that biological functions of GnRHs are not release of gonadotropins in current invertebrates and common ancestors of vertebrates and invertebrates. To date, authentic or putative GnRHRs have been characterized from various echinoderms and protostomes as well as chordates and the mRNAs have been found to be distributed not only reproductive organs but also other tissues. Collectively, these findings further support the notion that invertebrate GnRHs have biological roles other than the regulation of reproductive functions. Moreover, recent molecular phylogenetic analysis suggests that adipokinetic hormone (AKH), corazonin (CRZ), and AKH/CRZ-related peptide (ACP) belong to the GnRH superfamily but has led to the different classifications of these peptides and receptors using different datasets including the number of sequences and structural domains. In this review, we provide current knowledge of, and perspectives in, molecular basis and evolutionary aspects of the GnRH, AKH, CRZ, and ACP.http://journal.frontiersin.org/article/10.3389/fendo.2017.00217/fullgonadotropin-releasing hormoneadipokinetic hormonecorazoinreceptorinvertebrate |
spellingShingle | Tsubasa Sakai Akira Shiraishi Tsuyoshi Kawada Shin Matsubara Masato Aoyama Honoo Satake Invertebrate Gonadotropin-Releasing Hormone-Related Peptides and Their Receptors: An Update Frontiers in Endocrinology gonadotropin-releasing hormone adipokinetic hormone corazoin receptor invertebrate |
title | Invertebrate Gonadotropin-Releasing Hormone-Related Peptides and Their Receptors: An Update |
title_full | Invertebrate Gonadotropin-Releasing Hormone-Related Peptides and Their Receptors: An Update |
title_fullStr | Invertebrate Gonadotropin-Releasing Hormone-Related Peptides and Their Receptors: An Update |
title_full_unstemmed | Invertebrate Gonadotropin-Releasing Hormone-Related Peptides and Their Receptors: An Update |
title_short | Invertebrate Gonadotropin-Releasing Hormone-Related Peptides and Their Receptors: An Update |
title_sort | invertebrate gonadotropin releasing hormone related peptides and their receptors an update |
topic | gonadotropin-releasing hormone adipokinetic hormone corazoin receptor invertebrate |
url | http://journal.frontiersin.org/article/10.3389/fendo.2017.00217/full |
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