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WE-14, a chromogranin a-derived neuropeptide
W J Curry1, S C Barkatullah, A N Johansson
1Department of Ophthalmology and School of Clinical Medicine, Queen's University, Belfast, Northern Ireland. j.w.curry@qub.ac.uk
Annals of the New York Academy of Sciences
|November 20, 2002
Summary
The neuropeptide WE-14, derived from chromogranin A, is found in specific neuroendocrine cells across various glands. Its exact physiological function remains unknown despite identified receptor sites.
Area of Science:
- Neuroendocrinology
- Molecular Biology
- Cell Biology
Background:
- Chromogranin A (CgA) is a precursor protein widely expressed in neuroendocrine cells.
- The neuropeptide WE-14 is generated through posttranslational processing of CgA.
- WE-14 is found in specific CgA-immunopositive cell subpopulations, including adrenal, pituitary, and parathyroid glands.
Purpose of the Study:
- To investigate the cellular localization and expression patterns of the neuropeptide WE-14.
- To explore the physiological and pathological contexts of WE-14 generation.
- To understand the evolutionary and developmental origins of WE-14.
Main Methods:
- Immunohistochemistry to detect WE-14 in various tissues.
- Physiological and pharmacological studies on CgA cleavage.
- Chromatographic analysis of WE-14 concentrations in tissue extracts.
- Phylogenetic and ontogenetic analyses.
Main Results:
- WE-14 is generated in distinct CgA-immunopositive cells, particularly in adrenal, pituitary, and parathyroid glands.
- CgA cleavage produces WE-14 in adrenal chromaffin cells and gastric ECL cells.
- Neuroendocrine tumors show heterogeneous WE-14 immunostaining.
- WE-14 has an ancient lineage and is generated early in fetal development.
- Putative WE-14 receptors are identified in multiple tissues.
Conclusions:
- WE-14 is a phylogenetically ancient neuropeptide derived from CgA, with specific expression patterns.
- Its generation occurs in distinct cell types and at early developmental stages.
- Despite identified receptors, the physiological role of WE-14 remains to be elucidated.