Document Detail

Ontogeny of integumental calcium in relation to surface area and skin water content in the perinatal rat.
MedLine Citation:
PMID:  1399966     Owner:  NLM     Status:  MEDLINE    
Calcium is an important regulator of epidermal differentiation and skin biomechanics in many vertebrate species. In this study, we measured total epidermal calcium in the perinatal Sprague-Dawley rat. Values ranged from 12 to 15 mg per 100 g of tissue. These levels were elevated compared with dermis and other soft (nonbone) organs, including brain, kidney, heart, and liver. Administration of radioactive calcium to the pregnant rat resulted in high rates of 45Ca2+ localization in the fetal epidermis 24 h later. From gestational day 20 to postnatal day 3, the epidermis showed progressive dehydration with water content decreasing from 79 to 73%. Dermal hydration over the same period decreased from 91 to 81%. In the neonatal rat (age 0-3 days), linear regression analysis of surface area vs. body weight on a log-log plot yielded a slope of 1.04. This finding contrasts with an expected slope of 0.67 based on simple surface area-to-volume relationships and differs from the empirical 0.75-power law observed in adult bioenergetics. In summary, these results show the perinatal rat is encapsulated by a continuous differentially hydrated calcium-rich epidermal envelope that increases in surface area over the early postnatal period directly as the first power of body mass.
S B Hoath; W L Pickens; R Tanaka; R Ross
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  73     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  1992 Aug 
Date Detail:
Created Date:  1992-11-12     Completed Date:  1992-11-12     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol (1985)     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  458-64     Citation Subset:  IM    
Department of Pediatrics, Children's Hospital Medical Center, Cincinnati, Ohio 45229-2899.
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MeSH Terms
Animals, Newborn / metabolism*
Body Surface Area*
Body Water / metabolism*
Calcium / metabolism*
Calcium Radioisotopes / diagnostic use
Epidermis / metabolism
Rats, Sprague-Dawley
Skin / growth & development,  metabolism*
Grant Support
Reg. No./Substance:
0/Calcium Radioisotopes; 7440-70-2/Calcium

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

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