Comparison of the proliferative capacity of human corneal endothelial cells from the central and peripheral areas.
OBJECTIVE
To compare the relative proliferative capacity between human corneal endothelial cells (HCECs) cultured from the central and peripheral areas of the cornea.


METHODS
Human corneas were divided into two groups based on donor age (younger group, < or =30 years of age; older group, > or =50 years of age). Corneas were trephined, and Descemet's membrane with HCECs was stripped from the central (0-6.75 mm) and peripheral (6.75-9.5 mm) areas. HCECs were then isolated from Descemet's membrane and cultivated. An equal number of passage-1 endothelial cells from each area were seeded, and the number of cells was determined at various times after seeding. Doubling times of cells from each area were compared. The antibody against minichromosome maintenance-2 (MCM2) protein was tested for replication competence.


RESULTS
Morphologically, HCECs from the central area were similar to cells from the peripheral area. The doubling time (in hours) of HCECs from the central area was 35.20 in the younger group (n = 4) and 54.54 in the older group (n = 4) and from the peripheral area, 29.37 in the younger group and 46.23 in the older group. There was no significant difference (younger: P = 0.515; older: P = 0.222) between the central and peripheral area in each age group. MCM2-positive cells were consistently observed in cultures from the central, as well as peripheral, area. There was no significant difference (younger: P = 0.929; older: P = 0.613) in the percentage of MCM2-positive cells between these two areas in either age group. Even though there was no significant difference, there was a tendency toward increased doubling time and decreased percentage of MCM2 in the central area of the older group.


CONCLUSIONS
These results indicate that corneal endothelial cells from both the central and peripheral areas retain potential proliferative capacity.
Konomi
Kenji
K
Schepens Eye Research Institute and Department of Ophthalmology, Harvard Medical School, Boston, MA 02114, USA.
Zhu
Cheng
C
Harris
Deshea
D
Joyce
Nancy C
NC
D000293:Adolescent; D000328:Adult; D000368:Aged; D000375:Aging / Q000502:physiology; D002452:Cell Count; D018797:Cell Cycle Proteins / Q000378:metabolism; D049109:Cell Proliferation; D002478:Cells, Cultured; D004261:DNA Replication; D004728:Endothelium, Corneal / Q000166:cytology* / Q000378:metabolism; D019084:Fluorescent Antibody Technique, Indirect; D006801:Humans; D008875:Middle Aged; D064111:Minichromosome Maintenance Complex Component 2; D009687:Nuclear Proteins / Q000378:metabolism
D018797:Cell Cycle Proteins; D009687:Nuclear Proteins; C084859:MCM2 protein, human; D064111:Minichromosome Maintenance Complex Component 2