Neurons and neuroendocrine cells contain membrane-delimitedpools of peptide hormones, biogenic amines, and neurotransmitterswith a characteristic electron-dense appearance on transmissionelectron microscopy (Figure 1). These vesicles, which are presentthroughout the neuroendocrine system1,2 and in a variety ofneurons, store and release chromogranins and secretogranins(also known as "granins"), a unique group of acidic, solublesecretory proteins.3,4 The three "classic" granins are chromograninA, which was first isolated from chromaffin cells of the adrenalmedulla5,6; chromogranin B, initially characterized in a ratpheochromocytoma cell line7; and secretogranin II (sometimescalled chromogranin C), which was originally . . . [Full Text of this Article]
Molecular and Genetic Aspects of Granins
Structural and Physicochemical Properties
Genomic Organization and Transcriptional Regulation
Sorting Mechanisms
Intracellular Functions of Granins
Formation of Secretory Granules
Modulation of Peptide Hormone and Neuropeptide Processing
Extracellular Functions
Autocrine and Paracrine Inhibition of Secretion
Antimicrobial Properties of Granins
Distribution in Normal Neuroendocrine Tissues
Clinical Uses
Assays for Chromogranin A
Use of Granins as Diagnostic Markers or Biologic Markers
Pheochromocytoma
Carcinoid Tumors
Endocrine Pancreatic Tumors
Lung, Prostate, Colon, and Breast Tumors
Nonfunctioning Neuroendocrine Tumors
Essential Hypertension
Cerebrospinal Fluid Levels and Neuropsychiatric Diseases
Organ Failure
Conclusions
Source Information
From the Department of Medicine (L.T., K.L.H., D.T.O.) and the Center for Molecular Genetics (D.T.O.), University of California at San Diego, La Jolla; and the Veterans Affairs San Diego Healthcare System, San Diego, Calif. (L.T., K.L.H., D.T.O.).
Address reprint requests to Dr. O'Connor at the Department of Medicine (9111H), University of California at San Diego, 3350 La Jolla Village Dr., San Diego, CA 92161, or at doconnor@ucsd.edu.
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