Juvenile hormone
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In insects, juvenile hormone (also neotenin) refers to a group of hormones which ensure growth of the larva, while preventing metamorphosis. It is secreted by a gland located behind the brain. Juvenile hormone is also important for the production of eggs in female insects. Most insect species contain only juvenile hormone (JH) III. To date JH 0, JH I, and JH II have been identified only in the Lepidoptera (butterflies and moths). The form JHB3 (JH III bisepoxide) appears to be the most important JH in the Diptera, or flies.
Synthetic analogues of the juvenile hormone are used as an insecticide, preventing the larvae from developing into adult insects, and thus breaking the reproductive cycle. One of these, methoprene, is approved by WHO for use in drinking water cisterns to control mosquito larvae.
- juvenile hormone is produced by endocrine glands, the corpora allata
- Juvenile hormone 0
- CAS methyl (2E,6E)-10R,11S-(oxiranyl)-3,7-diethyl-11-methyl-2,6-tridecadienoate
- Formula: C19H32O3
- Juvenile hormone I
- CAS methyl (2E,6E)-10R,11S-(oxiranyl)-7-ethyl-3,11-dimethyl-2,6-tridecadienoate
- Formula: C18H30O3
- Juvenile hormone II
- CAS methyl (2E,6E)-10R,11S-(oxiranyl)-3,7,11-trimethyl-2,6-tridecadienoate
- Formula: C17H28O3
- Juvenile hormone III
- CAS methyl (2E,6E)-10R-(oxiranyl)-3,7,11-trimethyl-2,6-dodecadienoate
- Formula: C16H26O3
- Juvenile hormone JHB3
- CAS methyl (2E,6E)-6S,7S,10R-(dioxiranyl)-3,7,11-trimethyl-2,6-dodecadienoate
- Formula: C16H26O4
juvenile hormone is produced by paired endocrine glands behind the brain- one is a corpus allatum, the pair are called corpora allata. ja:幼若ホルモン