Table 3.

NMR peak ratios measured on K562wt and K562adr spectra. PBS: incubation in PBS; PFA: incubation in PFA; Triton : incubation in PFA and triton X; Smase: incubation in PFA, triton X-100 and 0.5 units sphingomyelinase. Results are expressed as means of arbitrary units ± SD multiplied by ten.

	K562wt				K562adr
Group	PBS (n = 4)	PFA (n = 7)	Triton (n = 7)	Smase (n = 4)	PBS (n = 4)	PFA (n = 7)	Triton (n = 8)	Smase (n = 5)
CH3/Ct	198 ± 21	231 ± 12	312 ± 42*	392 ± 105°	161 ± 19	192 ± 22	265 ± 62*	267 ± 42*
CH2/Ct	541 ± 52	611 ± 78	1060 ± 164*	1696 ± 441°	308 ± 93	386 ± 56	695 ± 141*	565 ± 167*
N(CH3)3/Ct	132 ± 6	141 ± 18	53 ± 10*	79 ± 17°	114 ± 12	132 ± 36	60 ± 15*	94 ± 39*

Statistical analysis : * : P < 0.05 when compared with PBS-incubated cells,

°: P < 0.05 when compared with Triton-treated cells,