Calcium influx enhances neuropeptide activation of ecdysteroid hormone production by mosquito ovaries

A critical step in mosquito reproduction is the ingestion of a blood meal from a vertebrate host. In mosquitoes like Aedes aegypti, blood feeding stimulates the release of ovary ecdysteroidogenic hormone (OEH) and insulin-like peptide 3 (ILP3). This induces the ovaries to produce ecdysteroid hormone...

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Veröffentlicht in:Insect biochemistry and molecular biology 2016-03, Vol.70, p.160-169
Hauptverfasser: McKinney, David A., Eum, Jai-Hoon, Dhara, Animesh, Strand, Michael R., Brown, Mark R.
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Eum, Jai-Hoon
Dhara, Animesh
Strand, Michael R.
Brown, Mark R.
description A critical step in mosquito reproduction is the ingestion of a blood meal from a vertebrate host. In mosquitoes like Aedes aegypti, blood feeding stimulates the release of ovary ecdysteroidogenic hormone (OEH) and insulin-like peptide 3 (ILP3). This induces the ovaries to produce ecdysteroid hormone (ECD), which then drives egg maturation. In many immature insects, prothoracicotropic hormone (PTTH) stimulates the prothoracic glands to produce ECD that directs molting and metamorphosis. The receptors for OEH, ILP3 and PTTH are different receptor tyrosine kinases with OEH and ILP3 signaling converging downstream in the insulin pathway and PTTH activating the mitogen-activated protein kinase pathway. Calcium (Ca2+) flux and cAMP have also been implicated in PTTH signaling, but the role of Ca2+ in OEH, ILP3, and cAMP signaling in ovaries is unknown. Here, we assessed whether Ca2+ flux affects OEH, ILP3, and cAMP activity in A. aegypti ovaries and also asked whether PTTH stimulated ovaries to produce ECD. Results indicated that Ca2+ flux enhanced but was not essential for OEH or ILP3 activity, whereas cAMP signaling was dependent on Ca2+ flux. Recombinant PTTH from Bombyx mori fully activated ECD production by B. mori PTGs, but exhibited no activity toward A. aegypti ovaries. Recombinant PTTH from A. aegypti also failed to stimulate either B. mori PTGs or A. aegypti ovaries to produce ECD. We discuss the implications of these results in the context of mosquito reproduction and ECD biosynthesis by insects generally. [Display omitted] •Ca2+ can enhance OEH and ILP3 activated ecdysteroid production by mosquito ovaries.•cAMP analog activation of this process is dependent on Ca2+.•Prothoracicotropic hormones do not stimulate this process in ovaries.
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In mosquitoes like Aedes aegypti, blood feeding stimulates the release of ovary ecdysteroidogenic hormone (OEH) and insulin-like peptide 3 (ILP3). This induces the ovaries to produce ecdysteroid hormone (ECD), which then drives egg maturation. In many immature insects, prothoracicotropic hormone (PTTH) stimulates the prothoracic glands to produce ECD that directs molting and metamorphosis. The receptors for OEH, ILP3 and PTTH are different receptor tyrosine kinases with OEH and ILP3 signaling converging downstream in the insulin pathway and PTTH activating the mitogen-activated protein kinase pathway. Calcium (Ca2+) flux and cAMP have also been implicated in PTTH signaling, but the role of Ca2+ in OEH, ILP3, and cAMP signaling in ovaries is unknown. Here, we assessed whether Ca2+ flux affects OEH, ILP3, and cAMP activity in A. aegypti ovaries and also asked whether PTTH stimulated ovaries to produce ECD. Results indicated that Ca2+ flux enhanced but was not essential for OEH or ILP3 activity, whereas cAMP signaling was dependent on Ca2+ flux. Recombinant PTTH from Bombyx mori fully activated ECD production by B. mori PTGs, but exhibited no activity toward A. aegypti ovaries. Recombinant PTTH from A. aegypti also failed to stimulate either B. mori PTGs or A. aegypti ovaries to produce ECD. We discuss the implications of these results in the context of mosquito reproduction and ECD biosynthesis by insects generally. 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Results indicated that Ca2+ flux enhanced but was not essential for OEH or ILP3 activity, whereas cAMP signaling was dependent on Ca2+ flux. Recombinant PTTH from Bombyx mori fully activated ECD production by B. mori PTGs, but exhibited no activity toward A. aegypti ovaries. Recombinant PTTH from A. aegypti also failed to stimulate either B. mori PTGs or A. aegypti ovaries to produce ECD. We discuss the implications of these results in the context of mosquito reproduction and ECD biosynthesis by insects generally. 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Results indicated that Ca2+ flux enhanced but was not essential for OEH or ILP3 activity, whereas cAMP signaling was dependent on Ca2+ flux. Recombinant PTTH from Bombyx mori fully activated ECD production by B. mori PTGs, but exhibited no activity toward A. aegypti ovaries. Recombinant PTTH from A. aegypti also failed to stimulate either B. mori PTGs or A. aegypti ovaries to produce ECD. We discuss the implications of these results in the context of mosquito reproduction and ECD biosynthesis by insects generally. [Display omitted] •Ca2+ can enhance OEH and ILP3 activated ecdysteroid production by mosquito ovaries.•cAMP analog activation of this process is dependent on Ca2+.•Prothoracicotropic hormones do not stimulate this process in ovaries.</abstract><cop>England</cop><pub>Elsevier Ltd</pub><pmid>26772671</pmid><doi>10.1016/j.ibmb.2016.01.001</doi><tpages>10</tpages><orcidid>https://orcid.org/0000-0001-9780-0781</orcidid><oa>free_for_read</oa></addata></record>
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subjects Aedes
Aedes aegypti
Amino Acid Sequence
Animals
Bombyx mori
Calcium - metabolism
Cyclic AMP - metabolism
Ecdysteroids - biosynthesis
Female
Insulin - metabolism
Insulin-like peptide
Molecular Sequence Data
Neuropeptides - chemistry
Neuropeptides - metabolism
Ovary - metabolism
Ovary ecdysteroidogenic hormone
Prothoracic gland
Prothoracicotropic hormone
Sequence Homology, Amino Acid
Signal Transduction
title Calcium influx enhances neuropeptide activation of ecdysteroid hormone production by mosquito ovaries
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