Date of Award
11-1-2014
Document Type
Masters Thesis
Degree Name
M.S.
Organizational Unit
College of Natual Science and Mathematics
First Advisor
Robert M. Dores, Ph.D.
Second Advisor
Joseph Angleson
Third Advisor
James E. Platt
Fourth Advisor
Keith Miller
Keywords
Melanocortin Receptors, Xenopus tropicalis
Abstract
The role of Melanocortin 2 Receptor (MC2R) in adrenal/interrenal glucocorticoid secretion has been well documented in many organisms. Studies in mammals have shown that in the adrenal gland two melanocortin receptors and two melanocortin receptor accessory proteins are expressed: MC2R, MC5R, MRAP, and MRAP2. The MRAPs have an opposite effect on the cell surface expression of MC2R and MC5R. In mammals, MRAP aids MC2R but inhibits MC5R cell surface expression. This thesis aims to explore the functional relationship between MC2R, MC5R, MRAP, and MRAP2 in Xenopus tropicalis to determine if the MRAPs have a similar effect on amphibian MC2R and MC5R when the receptors are stimulated with ACTH, or apha-MSH. Expression of these four genes in the frog interrenal was verified through RT-PCR. Then CHO-K1 cells were transfected with plasmid constructs containing X. tropicalis MC2R, MC5R, MRAP2, and a mouse MRAP, and stimulated with ACTH or alpha-MSH. Levels of receptor activation were measured using a CRE-luciferase reporter gene. The findings presented here indicate that in the frog the MRAPs do not have a negative effect on MC5R, since activation of MC5R was not inhibited in the presence of MRAPs. The sensitivity of MC5R for ACTH increased from an EC50 of 1.2 x 10-9 M to an EC50 of 8.7 x 10-11 M in the presence of MRAP (p50 of 1.3 x 10-10 M in the presence of MRAP2 (p
Publication Statement
Copyright is held by the author. User is responsible for all copyright compliance.
Rights Holder
Yesenia Garcia
Provenance
Received from ProQuest
File Format
application/pdf
Language
en
File Size
88 p.
Recommended Citation
Garcia, Yesenia, "Analyzing the Interactions Between Xenopus tropicalis MC2R, MC5R, and the MRAPs: Modeling the Regulation of Frog Interrenal Cells" (2014). Electronic Theses and Dissertations. 228.
https://digitalcommons.du.edu/etd/228
Copyright date
2014
Discipline
Biology, Cellular biology, Molecular biology