Question

Discuss the effect of juvenile hormone.

Answer 1

• 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.
• The primary control of juvenile hormone is by:

1) the stimulation of the corpora allata by allatotropins short peptides which bind to G-protein coupled receptors, which signal the glands to produce JH, and
2), the inhibition of JH production by allatostatins.

• Secondary control of the JH titre found in the hemolymph of the developing insect is metabolic inactivation of JH by JH-specific esterase and juvenile hormone epoxide hydrolase.