Faculty Publications

Title

Ligand regulation of juvenile hormone binding protein mRNA in mutant Manduca sexta

Document Type

Article

Keywords

Black mutant, Hemolymph juvenile hormone binding protein, Juvenile hormone, Manduca sexta, MRNA

Journal/Book/Conference Title

Molecular and Cellular Endocrinology

Volume

149

Issue

1-2

First Page

61

Last Page

69

Abstract

Insect hemolymph juvenile hormone binding protein (hJHBP) regulates peripheral titers of its ligands, the juvenile hormones. In larvae of the black (bl) strain of the tobacco hornworm, Manduca sexta, treatment with small doses of juvenile hormone I (JH I) can also regulate titers of hJHBP. To further investigate this regulation, responsiveness of hJHBP mRNA expression to JH I was characterized in vivo. RNA analyzes revealed that transcript levels in fat body, the site of hJHBP synthesis, increased fivefold within several hours of treatment with physiological doses of hormone and remained elevated for approximately 16 h. Sensitivity to JH treatment was found to vary temporally. To ensure transcript identity, a wild-type cDNA clone and a bl RT-PCR fragment were sequenced and found to be 99% homologous. Together, these results suggest that JH participates in regulating expression of its transport protein in bl larvae by modifying the in vivo abundance of hJHBP's mRNA transcript.

Original Publication Date

3-25-1999

DOI of published version

10.1016/S0303-7207(98)00258-5

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