1987 Fiscal Year Final Research Report Summary
Purification of TRH receptor and its mRNA
| Project/Area Number |
60570516
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
内分泌・代謝学
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| Research Institution | GUNMA UNIVERSITY |
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Principal Investigator |
MORI Masatomo Gunma University, 医学部, 助手 (80174382)
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| Project Period (FY) |
1985 – 1987
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| Keywords | TRH / TRH receptor / mRNA |
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| Research Abstract |
The crude plasma membrane of porcine and rat anterior pituitaries was homogenized in 40mM Tris HCl buffer containing 1% digitonin, incubated at 0 C for 30 min, and centrifuged at 100,000xg for 60 min. The resulting supernatant was incubated with (3h-MetHis)TRH at 0 C for 3 h, and the bound labeled TRH was separated by means of a rapid gel filtration. One% digitonin yielded to 40% solubilization of the original TRH receptor density. The peak of (3h) TRH-labeled TRH receptor was observed to correspond to that of (14C)myosin on a HPLC using Sorbax column, the data suggesting that a molecular weight of TRH receptor in the porcine anterior pituitary is approximately 200xK. The solubilized porcine TRH receptor was adsorbed by a wheat germ agglutinin column, and the adsorbed receptor eluted by 0.3M N-acetyl glucosamine. The data indicate that TRH receptor possesses N-acetyl-D-glucosaminyl residues. The solubilized porcine TRH receptor was observed to be Kd=30 nM and Bmax=62 fmol/mg protein. The sera from 18 patients with Hashimoto's thyroiditis were incubated with the solubilized porcine TRH receptor and (3H)TRH, to investigate the possible existence of an anti-TRH receptor antibody. However, those sera did not change TRH bound to the porcine anterior pituitary. The solubilized TRH receptor was applied to a AH-sephadex 4B coulumn coupled with TRH, and eluted by unlabeled TRH. This TRH-affinity chromatography system could result in an approximately 200- fold concentration of porcine TRH receptor. Further studies are in progress to obtain the 1,000-fold concentrated TRH receptor and determine an oligonucleotide probe corresponding to amino-acid sequence of porcine TRH receptor.
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Research Products
(8 results)
