Document Detail

Scaling of number, size, and metabolic rate of cells with body size in mammals.
MedLine Citation:
PMID:  17360590     Owner:  NLM     Status:  MEDLINE    
The size and metabolic rate of cells affect processes from the molecular to the organismal level. We present a quantitative, theoretical framework for studying relationships among cell volume, cellular metabolic rate, body size, and whole-organism metabolic rate that helps reveal the feedback between these levels of organization. We use this framework to show that average cell volume and average cellular metabolic rate cannot both remain constant with changes in body size because of the well known body-size dependence of whole-organism metabolic rate. Based on empirical data compiled for 18 cell types in mammals, we find that many cell types, including erythrocytes, hepatocytes, fibroblasts, and epithelial cells, follow a strategy in which cellular metabolic rate is body size dependent and cell volume is body size invariant. We suggest that this scaling holds for all quickly dividing cells, and conversely, that slowly dividing cells are expected to follow a strategy in which cell volume is body size dependent and cellular metabolic rate is roughly invariant with body size. Data for slowly dividing neurons and adipocytes show that cell volume does indeed scale with body size. From these results, we argue that the particular strategy followed depends on the structural and functional properties of the cell type. We also discuss consequences of these two strategies for cell number and capillary densities. Our results and conceptual framework emphasize fundamental constraints that link the structure and function of cells to that of whole organisms.
Van M Savage; Andrew P Allen; James H Brown; James F Gillooly; Alexander B Herman; William H Woodruff; Geoffrey B West
Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2007-03-01
Journal Detail:
Title:  Proceedings of the National Academy of Sciences of the United States of America     Volume:  104     ISSN:  0027-8424     ISO Abbreviation:  Proc. Natl. Acad. Sci. U.S.A.     Publication Date:  2007 Mar 
Date Detail:
Created Date:  2007-03-15     Completed Date:  2007-05-14     Revised Date:  2013-06-06    
Medline Journal Info:
Nlm Unique ID:  7505876     Medline TA:  Proc Natl Acad Sci U S A     Country:  United States    
Other Details:
Languages:  eng     Pagination:  4718-23     Citation Subset:  IM    
Department of Systems Biology, Harvard Medical School, Boston, MA 02115, USA.
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MeSH Terms
Adipocytes / cytology,  metabolism
Adipose Tissue / metabolism
Body Constitution
Body Size*
Body Weight
Cell Size
Energy Metabolism
Fibroblasts / metabolism
Models, Statistical
Neurons / metabolism
Species Specificity
Grant Support

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