Document Detail

Evidence for calcitonin-producing cells in human lingual thyroids.
MedLine Citation:
PMID:  22238389     Owner:  NLM     Status:  MEDLINE    
CONTEXT: The thyroid contains two types of cells, the thyroid follicular cells and the calcitonin-producing cells. The site of origin of the thyroid follicular cells is the median thyroid anlage, an endothelial diverticulum in the midline of the ventral pharynx between the first and the second pharyngeal pouches. The ultimobranchial bodies (UBB), a pair of transient embryonic structures evaginated from the fourth pharyngeal pouch and located symmetrically on the sides of the developing neck, are the source of calcitonin-producing cells. In human embryos, the thyroid bud starts its migration at embryonic day 24 and reaches its final location in front of the trachea at embryonic day 45-50. The UBB fuse with the primitive thyroid when thyroid migration is completed. Lingual thyroids result from the failure of the thyroid precursor cells to migrate from the primordial pharynx to the anterior part of the neck. Therefore, calcitonin-producing cells are not expected to be present in lingual thyroids.
OBJECTIVE: Our objective was to determine whether calcitonin-producing C cells are present in ectopic lingual thyroids.
DESIGN, SETTING, PATIENTS, AND MAIN OUTCOME MEASURE: We performed calcitonin immunolabeling and transcript detection on four flash-frozen ectopic lingual thyroids. Additional calcitonin immunolabeling was performed on two other paraffin-embedded ectopic lingual thyroids.
RESULTS: We report evidence of calcitonin-producing cells in six independent cases of ectopic lingual thyroids.
CONCLUSION: The UBB are not the only source of calcitonin-producing cells in humans. Interactions between calcitonin-producing and thyroid follicular cells occur earlier than previously accepted.
Isabelle Vandernoot; Hervé Sartelet; Rasha Abu-Khudir; Jean-Pierre Chanoine; Johnny Deladoëy
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-01-11
Journal Detail:
Title:  The Journal of clinical endocrinology and metabolism     Volume:  97     ISSN:  1945-7197     ISO Abbreviation:  J. Clin. Endocrinol. Metab.     Publication Date:  2012 Mar 
Date Detail:
Created Date:  2012-03-06     Completed Date:  2012-07-06     Revised Date:  2013-11-06    
Medline Journal Info:
Nlm Unique ID:  0375362     Medline TA:  J Clin Endocrinol Metab     Country:  United States    
Other Details:
Languages:  eng     Pagination:  951-6     Citation Subset:  AIM; IM    
Research Center of Sainte-Justine Hospital, Department of Pediatrics, University of Montreal, Montréal, Quebec, Canada H3T 1C5.
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MeSH Terms
Calcitonin / genetics,  metabolism*
Lingual Thyroid / metabolism*,  pathology
Reg. No./Substance:

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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