Document Detail

Individual parathyroid cells exhibit cyclic secretion of parathyroid hormone and chromogranin-A (as measured by a novel sequential hemolytic plaque assay).
MedLine Citation:
PMID:  1446605     Owner:  NLM     Status:  MEDLINE    
PTH and chromogranin-A (CgA) are the two major proteins secreted from the parathyroid gland. We investigated the secretory patterns of CgA and PTH using a sequential reverse hemolytic plaque assay (RHPA). The RHPA allows detection of hormone secretion from individual cells after a secretory stimulus. For the sequential RHPA, bovine parathyroid cells were mixed with protein-A-conjugated ovine erythrocytes (oRBC). Antiserum, either anti-PTH or anti-CgA, was added under optimal secretory conditions. The addition of complement caused lysis of oRBC surrounding hormone-secreting cells. In this stage (stage 1), individual cells were identified and indexed as secreting or nonsecreting cells. For stage 2, a new lawn of oRBC was established, and a second RHPA was performed on the same population of cells, allowing for the detection of secretory patterns. In the single stage RHPA, about three fourths of the cells formed CgA plaques compared to only about half that formed PTH plaques, suggesting that CgA and PTH are not always cosecreted. In the sequential RHPA, of the cells that did not secrete CgA or PTH in stage 1, up to half secreted in stage 2. Of those cells that secreted in stage 1, up to one fourth did not secrete in stage 2. These results indicate that the parathyroid cells "cycled" between secretory and nonsecretory phases. Our experimental design precluded our obtaining unequivocal data on whether CgA is an autocrine/paracrine regulator of PTH secretion.
C K Ritchie; D V Cohn; P B Maercklein; L A Fitzpatrick
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Endocrinology     Volume:  131     ISSN:  0013-7227     ISO Abbreviation:  Endocrinology     Publication Date:  1992 Dec 
Date Detail:
Created Date:  1992-12-30     Completed Date:  1992-12-30     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0375040     Medline TA:  Endocrinology     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  2638-42     Citation Subset:  AIM; IM    
Endocrine Research Unit, Mayo Clinic, Rochester, Minnesota 55905.
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MeSH Terms
Chromogranin A
Chromogranins / secretion*
Hemolytic Plaque Technique
Parathyroid Glands / secretion*
Parathyroid Hormone / secretion*
Staphylococcal Protein A
Grant Support
Reg. No./Substance:
0/Chromogranin A; 0/Chromogranins; 0/Parathyroid Hormone; 0/Staphylococcal Protein A

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