2005 Fiscal Year Final Research Report Summary
Development of progressive technique in receptor assay with living tissue slices which can evaluate availability of radiopharmaceuticals.
| Project/Area Number |
16591184
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Radiation science
|
|---|
| Research Institution | Gunma University |
|---|
Principal Investigator |
IIDA Yasuhiko GUNMA UNIVERSITY, Graduate School of Medicine, Associate Professor, 大学院・医学系研究科, 助教授 (60252425)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
ORIUCHI Noboru GUNMA UNIVERSITY, Graduate School of Medicine, Associate Professor, 医学系研究科, 助教授 (40292586)
|
|---|
| Project Period (FY) |
2004 – 2005
|
| Keywords | neuroreceptor / binding affinity / brain slice / acetylcholine receptor / serotonin transporter / receptor binding / PET |
|---|
| Research Abstract |
It is very important to evaluate a receptor binding affinity of novel neuro-functional radiopharmaceuticals accurately when we are developing these compounds. Currently we usually measure the affinity of them with radio-receptor assay, using receptor preparation removed from living tissue, but structure of the receptor may be different from its natural state because the receptor was under in vitro condition. For the purpose of evaluating the affinity of these developing pharmaceuticals, easy, quick and accurate procedure is desirable in screening test. In this study, we tried to put on a new method which can evaluate the receptor binding affinity by keeping the condition like under living body. We will compare the affinity measured from new method with those measured from conventional in vivo and in vitro methods. First, we developed a new radiopharmaceutical for comparing and evaluating the affinity. Nicotinic acetylcholine receptors (nAChRs) are implicated in various brain functions, such as cognition and memory, so we synthesized a derivative of 3-(2-(S)-azetidinylmethoxy) pyridine (A-85380), 5IA, and its binding property in vivo are evaluated. From our experimental data, 5IA has high affinity to nAChRs in vivo and we can easily measure the binding property in vivo and in vitro. In next experiment, we synthesized [^<11>C]DASB, which show selective binding to serotonin trans porter (SERT), and evaluated its binding property in vivo in normal control and patients of neuro-degenerative diseases by PET. From this study, [^<11>C]DASB has great potential for in vivo PET imaging of SERT and we will be able to compare the affinity with those from in vivo and in vitro assay.
|
Research Products
(5 results)
