Serum-free corneal organ culture medium (SFM) but not conventional minimal essential organ culture medium (MEM) protects human corneal endothelial cells from apoptotic and necrotic cell death.
OBJECTIVE
To evaluate the influence of organ culture media on corneal endothelial cell survival.


METHODS
The human corneal endothelial cell line HCEC-12 was cultured in five different media: human corneal endothelial cell (HCEC) growth medium (F99(HCEC)), standard minimal essential corneal organ culture medium (MEM)+2% fetal calf serum (FCS), MEM+5% FCS, and humanised, endothelial serum-free medium (SFM) (with and without antibiotics). A portion of the cells was treated with 0.5 μmol/l staurosporine and examined for signs of apoptosis by assessing mitochondrial membrane polarisation state (intravital JC-1 staining), by YO-PRO-1 and propidium iodide staining, by determining fragmentation of nuclei by sub-G1 DNA content, by immunocytochemistry for cleaved caspase-3, cleaved caspase-8, Bcl2-associated X protein (Bax) and B-cell lymphoma 2 (Bcl-2), and by western blotting for cleaved caspase-3 and cleaved poly (ADP-ribose) polymerase (PARP).


RESULTS
The number of apoptotic cells in untreated control cultures was significantly higher in MEM compared with F99(HCEC) and SFM. Staurosporine treatment induced apoptosis in all tested cultures to varying degrees. Cells cultured in MEM showed stronger staining for cleaved caspase-3, cleaved caspase-8, Bax, Bcl-2 and cleaved PARP, increased sub-G1 DNA content, more propidium iodide- and YO-PRO-1-positive cells, and more mitochondria with depolarised membranes. All parameters were significantly higher in MEM compared with F99(HCEC) and SFM. SFM cultures were significantly less susceptible to cell stress.


CONCLUSIONS
SFM is superior to MEM in promoting HCEC survival.
Jäckel
Thekla
T
Institute of Anatomy, Medical Faculty, TU Dresden, Germany.
Knels
Lilla
L
Valtink
Monika
M
Funk
Richard H W
RH
Engelmann
Katrin
K
D000818:Animals; D017209:Apoptosis / Q000187:drug effects*; D002460:Cell Line; D002470:Cell Survival / Q000187:drug effects*; D002478:Cells, Cultured; D016895:Culture Media, Serum-Free / Q000494:pharmacology*; D004728:Endothelium, Corneal / Q000166:cytology / Q000187:drug effects*; D005434:Flow Cytometry; D006801:Humans; D007150:Immunohistochemistry; D009924:Organ Culture Techniques; D019188:Organ Preservation Solutions / Q000494:pharmacology*
D016895:Culture Media, Serum-Free; D019188:Organ Preservation Solutions