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Published on: October 29, 2019
Systemic distribution of salusin expression in the rat
Noriko Suzuki1, Masayoshi Shichiri, Takumi Akashi
1Department of Clinical and Molecular Endocrinology, Tokyo Medical and Dental University, Tokyo, Japan.
Summary
Salusin-beta, a bioactive peptide, is widely distributed in rat organs, particularly in the hypothalamus and immune system. Salusin-alpha was not detected, suggesting rat salusin-beta is the primary functional form.
Area of Science:
- Biochemistry
- Molecular Biology
- Physiology
Background:
- Salusin-alpha and salusin-beta are bioactive peptides with known hypotensive and bradycardic effects.
- These peptides were initially identified in humans via bioinformatics analysis of cDNA.
- Systemic distribution data for salusin peptides across species is currently lacking.
Purpose of the Study:
- To investigate the tissue distribution of preprosalusin mRNA and salusin peptides in normal rats.
- To determine the cellular origins of salusin-beta expression in various rat organs.
Main Methods:
- Quantitative analysis of preprosalusin mRNA expression across different rat organs.
- Immunohistochemical detection of salusin-beta peptide distribution using specific antibodies.
- Co-localization studies using anti-CD68 antibody to identify macrophage markers.
Main Results:
- Preprosalusin mRNA was found to be ubiquitously expressed in all examined rat tissues.
- Immunoreactive salusin-beta was predominantly detected in the hypothalamus and posterior pituitary.
- Salusin-beta was also found in the anterior pituitary, gastrointestinal, immune, and hematopoietic systems, with positive cells of hematopoietic or endocrine origin, including macrophages.
Conclusions:
- Rat salusin-beta exhibits wide expression, particularly in the central nervous, immune, and gastrointestinal systems.
- The expression pattern suggests a significant role for salusin-beta in endocrine and hematopoietic functions.
- Salusin-alpha-like immunoreactivity was absent in rat tissues, indicating salusin-beta is the predominant form in rats.
