Natriuretic peptides in ectopic myocardial tissues originating from mouse embryonic stem cells
| Autor: | Li Cui, Yasumitsu Okouchi, Keiko Nitta, Fengming Yue, Kazuhiko Asanuma, Kohei Johkura, Shunsuke Takei, Katsunori Sasaki, Naoko Ogiwara |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
medicine.medical_specialty
Pathology Histology Myosin Light Chains Immunoelectron microscopy Immunocytochemistry Connexin Mice Nude Embryoid body Biology Cell Line Mice Internal medicine Natriuretic Peptide Brain medicine Animals Myocytes Cardiac Retroperitoneal Space Microscopy Immunoelectron Natriuretic Peptides Instrumentation Microscopy Confocal Cadherin Embryonic stem cell Immunohistochemistry Transplantation Medical Laboratory Technology Endocrinology cardiovascular system Anatomy Cardiac Myosins hormones hormone substitutes and hormone antagonists Atrial Natriuretic Factor Stem Cell Transplantation |
| Zdroj: | Microscopy research and technique. 66(4) |
| ISSN: | 1059-910X |
| Popis: | In a previous report we described the survival and contractile function of mouse embryonic stem cell-derived cardiomyocytes in the host retroperitoneum. To further understand the nature of embryonic stem cell-derived cardiomyocytes, the study assessed the synthesis of natriuretic peptides in ectopic myocardial tissues of embryonic stem cell origin. Cardiomyocytes formed in embryoid body outgrowths were transplanted into the retroperitoneum of adult nude mice, and the myocardial tissues that developed were characterized by RT-PCR and immunohistochemistry concerning atrial and brain natriuretic peptides (ANP, BNP). In the outgrowths of embryoid bodies in vitro, gene expression of ANP and BNP was detected by RT-PCR and granules positive for the peptides were identified in a few cardiomyocytes by light and electron microscopic immunocytochemistry. Seven days after transplantation the transplants exhibited multidifferentiated teratoma tissues. Developing chamber myocardial tissues positive for cardiac troponin I, cadherin, and connexin 43 were evident in the transplants, which contained ANP-positive cardiomyocytes. Transplants with beating bundles were observed 30 days after transplantation, in which gene expression of both natriuretic peptides was detected. Myocardial tissues with abundant ANP-immunoreactivity, as well as with BNP-immunoreactivity to a lesser extent, were evident in the transplants. Also, myocardial tissues without immunoreactivity for natriuretic peptides were observed. Immunoelectron microscopy showed discernible secretory granules containing ANP and/or BNP in the cardiomyocytes. These results showed that part of the cardiomyocytes in embryonic stem cell-derived ectopic myocardial tissues are capable of producing natriuretic peptides, which suggests that they may be used as an endocrine source for cardiac hormones. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text