[Tissue condition of human corneas before and after organ culture. Effect of donor cause of death].
Recent studies have shown that the human cornea reflects the metabolic status of the donor. Nevertheless, it has not yet been shown whether this leads to a different tolerance of organ culture and whether these changes are reversible or not.


METHODS
Eighty-five organ-cultured human corneas were investigated. Endothelial cell density and the concentrations of glucose, lactate, ATP and ADP were determined in each cornea by enzymatic-optical methods. Obduction protocols were examined and five groups of donors could be determined: (1) donors who had died suddenly; (2) donors who had died of malignant processes; (3) donors with septicaemia; (4) renal-insufficient donors; and (5) diabetic donors.


RESULTS
Endothelial cell density decreased significantly after 28 days of organ culture. Deswelling for 1 day in a medium containing dextran 500 caused additional cell loss. On the basis of biochemical parameters, the corneas showed recovery after organ culture: especially ATP and ADP concentrations increased. Glucose concentrations decreased and lactate concentration increased in the closed organ culture system. Best recovery was observed in corneas from septic donors and from those who had died of carcinoma. Overall, an equalization of all corneas after the culture period was observed. In contrast, the deswelling period causes deterioration of metabolic status; ATP concentration decreased dramatically, and ADP increase was higher than expected.


CONCLUSIONS
From these data we conclude that there is no donor disease that could lead to exclusion of the cornea from organ culture. In fact, organ culture leads to a recovery of the metabolic status of the human cornea.
Redbrake
C
C
Augenklinik, RWTH Aachen.
Salla
S
S
Vonderhecken
M
M
Sieben
P
P
Reim
M
M
D002423:Cause of Death; D002452:Cell Count; D016039:Corneal Transplantation / Q000473:pathology*; D004728:Endothelium, Corneal / Q000473:pathology; D004734:Energy Metabolism / Q000502:physiology; D006801:Humans; D009926:Organ Preservation; D014019:Tissue Donors; D014022:Tissue Survival