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Localized endocrine conversion of ventricular cardiocytes in ventricular aneurysm.
- Source :
-
The journal of histochemistry and cytochemistry : official journal of the Histochemistry Society [J Histochem Cytochem] 1990 Nov; Vol. 38 (11), pp. 1659-68. - Publication Year :
- 1990
-
Abstract
- Atrial natriuretic peptide (ANP) is synthesized and stored in the atria of the heart, but not or at very low concentrations in the ventricles. We investigated the occurrence of ANP and its messenger RNA (mRNA) in human ventricular aneurysm where the cardiocytes were physically over-stretched. The techniques of light and electron microscopic immunocytochemistry, and RNA-RNA tissue in situ hybridization were employed. A large amount of ANP immunoreactivity was found in the cytoplasm of the cardiocytes in and around the aneurysm, but not in fibrous scar tissue or in the normal ventricles. Immunoelectron microscopy localized the immunoreactivity mainly to specific secretory granules in the cytoplasm of the cardiocytes. ANP mRNA was also detected in these cardiocytes. The abundance of both was much higher than that found in the hypertrophic ventricles of other types. The highest concentration of ANP immunoreactivity and of ANP mRNA was found in the cardiocytes located at the border zone. The quantities of both ANP and its mRNA decreased in cardiocytes more distant from the lesion. Our findings suggest that human ventricular cardiocytes in and around aneurysm can convert to produce large amounts of the endocrine peptide ANP. This ventricular endocrine conversion was localized and was probably caused by physical over-stretch of the cardiocytes.
- Subjects :
- Aged
Atrial Natriuretic Factor genetics
Cytoplasmic Granules metabolism
Cytoplasmic Granules ultrastructure
Heart Aneurysm metabolism
Heart Ventricles metabolism
Heart Ventricles pathology
Heart Ventricles ultrastructure
Humans
Immunohistochemistry methods
Microscopy, Electron methods
Middle Aged
Nucleic Acid Hybridization
RNA, Messenger genetics
RNA, Messenger metabolism
Atrial Natriuretic Factor metabolism
Heart Aneurysm pathology
Subjects
Details
- Language :
- English
- ISSN :
- 0022-1554
- Volume :
- 38
- Issue :
- 11
- Database :
- MEDLINE
- Journal :
- The journal of histochemistry and cytochemistry : official journal of the Histochemistry Society
- Publication Type :
- Academic Journal
- Accession number :
- 2145358
- Full Text :
- https://doi.org/10.1177/38.11.2145358