Aging Aging

Fibroblast Model for Cell Senescence Studies 33Table 4Components of Serum-Free Growth MediumComponent Amount Supplier Cat. no.MCDB-104, a modified basal mediumwith L-glutamine, without CaCl 2 ,without Na 2 HPO 4 , without NaHCO 3 ,and without HEPES, and with sodiumpantothenate substituted for calciumpantothenate 1 pkg/L Gibco-BRL 82-5006EASodium phosphate, dibasic 0.426 g/L Sigma S5136Sodium chloride 1.754 g/L Sigma S5886Calcium chloride dihydrate 1 mM Sigma C7902Sodium bicarbonate 1.176 g/L Sigma S5761HEPES a 11.9 g/L Sigma H91361 M Sodium hydroxide a 25 mL/L Sigma S2770EGF), human recombinant 25 ng/mL Gibco-BRL 13247-010IGF-I, human recombinant 100 ng/mL Gibco-BRL 13245-014Insulin 5 µg/mL Sigma I6634Ferrous sulfate heptahydrate 5 µM Sigma F86331 M Hydrochloric acid Trace Sigma H9892Dexamethasone 55 ng/mL Sigma D490295% Ethanol (not denatured) Trace Pharmco 111000-190CSGLa Not used in growth medium. See Note 1.6. Standard serum-supplemented growth medium (complete medium with 10% v/vFBS): To prepare the standard serum-supplemented growth medium (completemedium with 10% v/v FBS), add 13 mL of filter-sterilized 7.5% (w/v) sodiumbicarbonate to 432 mL of sterile, incomplete Eagle’s MEM. The sodium bicarbonatemust be added first because low pH can affect glutamine and serum components.After addition of the sodium bicarbonate add 50 mL of sterile FBS. Justbefore use the medium is prewarmed to 37°C in a warm water bath, then transferredto a laminar flow hood where 5 mL of a 200 mM solution of filter-sterilizedL-glutamine is added. Complete medium is generally prepared fresh for each use.If this medium must be stored for periods exceeding 1 wk, additional filter-sterilizedL-glutamine (1 mL/100 mL of complete medium) is added just before use.2.2. Serum-Free MediumSuppliers and more detailed information on the items required for the preparationof serum-free media are listed in Table 4.1. Serum-free growth medium: This medium is prepared by dissolving a packet ofpowdered MCDB-104 medium (with L-glutamine, without CaCl 2 , without