| Title |
Microscopic visualization of testosterone in mouse testis by use of imaging mass spectrometry
|
|---|---|
| Published in |
Analytical & Bioanalytical Chemistry, May 2016
|
| DOI | 10.1007/s00216-016-9594-9 |
| Pubmed ID | |
| Authors |
Shuichi Shimma, Henri-Obadja Kumada, Hisanori Taniguchi, Alu Konno, Ikuko Yao, Kyoji Furuta, Tadashi Matsuda, Seiji Ito |
| Abstract |
Testosterone is one of the androgens synthesized from cholesterol as a precursor in the Leydig cells of testes. Since the ionization efficiency of testosterone in matrix-assisted laser desorption ionization (MALDI) is quite low, visualization of testosterone by using MALDI-imaging mass spectrometry (MALDI-IMS) has been considered difficult. To overcome this problem, we used two types of on-tissue derivatization techniques, which were achieved by pyridine sulfur trioxide and Girard's T (GT) reagent, to introduce a polar group into testosterone molecule with the aim to increase the sensitivity. Derivatization by use of GT reagent provided excellent results, superior to those obtained with pyridine sulfur trioxide, in terms of ionization efficiency, molecular specificity, and tissue damage. In GT derivatized testis tissues of mice treated with human chorionic gonadotropin (hCG), testosterone was broadly observed both inside and outside the seminiferous tubules by using an iMScope. To evaluate our imaging results, we performed quantification experiments of underivatized testosterone extracted from hCG-treated testes and control testes using LC-MS/MS. We confirmed the 256-fold concentration change between hCG-treated tissues and control tissues. We also confirmed the 228-fold change in detected peak intensities between hCG-treated tissue sections and control tissue sections in imaging results. We consider our tissue preparation methods for IMS provide high sensitivity with high precision. In addition, high-spatial definition IMS was also available, and we confirmed testosterone had mainly accumulated on the surface of the Leydig cells. Graphical abstract Girard's T-testosterone (GT-Ts) provides the fragment ion at m/z 343.24. Clear GT-Ts signal was detected in hCG treated mouse testis not only as spectra but also as a mass image. |
X Demographics
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Geographical breakdown
| Country | Count | As % |
|---|---|---|
| Unknown | 1 | 100% |
Demographic breakdown
| Type | Count | As % |
|---|---|---|
| Scientists | 1 | 100% |
Mendeley readers
The data shown below were compiled from readership statistics for 49 Mendeley readers of this research output. Click here to see the associated Mendeley record.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| Unknown | 49 | 100% |
Demographic breakdown
| Readers by professional status | Count | As % |
|---|---|---|
| Student > Ph. D. Student | 8 | 16% |
| Student > Master | 7 | 14% |
| Student > Bachelor | 6 | 12% |
| Other | 4 | 8% |
| Researcher | 4 | 8% |
| Other | 7 | 14% |
| Unknown | 13 | 27% |
| Readers by discipline | Count | As % |
|---|---|---|
| Chemistry | 9 | 18% |
| Biochemistry, Genetics and Molecular Biology | 6 | 12% |
| Medicine and Dentistry | 6 | 12% |
| Agricultural and Biological Sciences | 5 | 10% |
| Pharmacology, Toxicology and Pharmaceutical Science | 3 | 6% |
| Other | 6 | 12% |
| Unknown | 14 | 29% |
Attention Score in Context
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#22,759,802
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