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Juvenile hormone
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Juvenile hormones (JHs) are a group of acyclic sesquiterpenoids that regulate many aspects of insect physiology, such as development, reproduction, diapause, and polyphenisms. In insects, JH (also neotenin) refers to a group of hormones which ensure growth of the larva, while preventing metamorphosis. Because of their rigid exoskeleton, insects can grow only by periodically shedding their exoskeleton (a process known as molting).
Juvenile hormones are secreted by a pair of endocrine glands behind the brain called the corpora allata.
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Encyclopedia
Juvenile hormones (JHs) are a group of acyclic sesquiterpenoids that regulate many aspects of insect physiology, such as development, reproduction, diapause, and polyphenisms. In insects, JH (also neotenin) refers to a group of hormones which ensure growth of the larva, while preventing metamorphosis. Because of their rigid exoskeleton, insects can grow only by periodically shedding their exoskeleton (a process known as molting).
Juvenile hormones are secreted by a pair of endocrine glands behind the brain called the corpora allata. JHs are also important for the production of eggs in female insects. JH was discovered in 1965 and the structure solved in 1967.
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. Certain species of crustaceans have been shown to produce and secrete methyl farnesoate, which is juvenile hormone III lacking the epoxide group. Methyl farnesoate is believed to play a role similar to that of JH in crustaceans.
Control of development
The titre of JH found in the haemolymph of the developing insect controls the stage of development that the insect is in. During ecdysis the form of the new cuticle laid down before the next moult is controlled by the JH level in the insect. JH maintains a juvenile state, and so the level of it gradually decreases during the development of the insect, allowing it to proceed to successive instars with each moult.
This has been demonstrated in various studies, most prominently that by V. B. Wigglesworth in 1960s. In this study, two adult Rhodnius had their blood systems linked, ensuring that the JH titre in both would be equal. One was a third instar Rhodnius, the other was a fourth instar. When the corpora allata of the third instar insect were removed, the level of JH was equal in both insects to that in the fourth instar animal, and hence both proceeded to the fifth instar at the next moult. When the fourth instar Rhodnius had its corpora allata removed, both contained a third instar level of JH and hence one proceeded to instar four, and the other remained at this instar.
Generally, the removal of the corpora allata from juveniles will result in a diminutive adult at the next moult. Implantation of corpora allata into last larval instars will boost JH levels and hence produce a supernumary (extra) juvenile instar etc.
Juvenile hormones in honey bees
There is a complex interaction between JH, the hormone ecdysone and vitellogenin. In the development stage, as long as there is enough JH, the ecdysone promotes larva-to-larva molts. With lower amounts of JH, ecdysone promotes pupation. Complete absence of JH results in formation of the adult.
In adult honey bees, JH and Vitellogenin titers in general show an inverse pattern.
JH titers in worker honey bees progressively increase through the first 15 or so days of the worker's life before the onset of foraging.
During the first 15 days, workers perform tasks inside the hive, such as nursing larvae, constructing comb, and cleaning cells. JH titers peak around day 15; workers this age guard, remove dead bees from the colony, and fan at the colony entrance to cool the nest. Aggressiveness of guard bees is correlated with their blood JH levels. Even though guards have high JH levels, their ovaries are relatively undeveloped. Although. JH does not activate foraging, but rather is involved in controlling the pace at which bees develop into foragers.
Vitellogenin titers are high in the beginning of adult life and slowly decreasing.
JH has been known to be involved in the queen-worker caste differentiation during the larval stage. The unique negative relationship between JH and Vg may be important to the understanding of queen longevity.
See also Bee learning and communication
Forms
- Juvenile hormone 0 (found in Lepidoptera)
- CAS methyl (2E,6E)-10R,11S-(oxiranyl)-3,7-diethyl-11-methyl-2,6-tridecadienoate
- Formula: C19H32O3
- Juvenile hormone I (found in Lepidoptera)
- CAS methyl (2E,6E)-10R,11S-(oxiranyl)-7-ethyl-3,11-dimethyl-2,6-tridecadienoate
- Formula: C18H30O3
- Juvenile hormone II (found in Lepidoptera)
- CAS methyl (2E,6E)-10R,11S-(oxiranyl)-3,7,11-trimethyl-2,6-tridecadienoate
- Formula: C17H28O3
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- CAS methyl (2E,6E)-10R-(oxiranyl)-3,7,11-trimethyl-2,6-dodecadienoate
- Formula: C16H26O3
- (found in diptera)
- CAS methyl (2E,6E)-6S,7S,10R-(dioxiranyl)-3,7,11-trimethyl-2,6-dodecadienoate
- Formula: C16H26O4
- Methyl farnesoate
- CAS methyl (2E,6E)-3,7,11-trimethyl-2,6-dodecadienoate
- Formula: C16H26O2
Use as an insecticide
Synthetic analogues of the juvenile hormone are used as an insecticide, preventing the larvae from developing into adult insects. At high levels of JH, larva can still molt, but the result will only be a bigger larva, not an adult. Thus the reproductive cycle is broken. One insecticide, methoprene, is approved by WHO for use in drinking water cisterns to control mosquito larvae.
Juvenile Hormone Regulation
Juvenile hormone is produced in the Corpora Allatum of insects. JH will disperse throughout the hemolymph and act on responsive tissues. Degradation of JH by enzymes like Juvenile Hormone Esterase (JHE) or Juvenile Hormone Epoxidhydrolase (JHEH). JHE and JHEH are both JH signal suppressors and JH signal responsive. Tissues responsive to JH, can be identified by the expression or presence of JHE.
Reproductive Roles for Juvenile Hormone
JH stimulates the accessory glands of adult males to promote gland growth and sex peptide production. Yolk production, vitellogenesis in female ovaries is also stimulated by JH action. JH levels in both males and females, to some degree, regulate reproductive behavior as well.
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