TABLE 1.

Rates of proton extrusion from prostatic carcinoma cells

Cell type	Medium	ECAR	pH decreasea	JH+, obs
		μV s−1	units min−1	nm min−1 (%)
PC-3	Na+-HBSS	320 ± 40b (n = 10)	0.32 ± 0.04	43.3 ± 5.4 (100)
PC-3	Choline-HBSS	211 ± 78 (n = 13)	0.21 ± 0.08	28.6 ± 10.6 (66)
LNCaP	Na+-HBSS	283 ± 61b (n = 9)	0.28 ± 0.06	37.9 ± 8.3 (88) (100) c
LNCaP	Choline-HBSS	184 ± 52 (n = 6)	0.18 ± 0.05	24.4 ± 7.0 (56) (64)c

^a Data are from an initial pH of 7.4 (40 nm H⁺).

^b t_obt = 1.56, p > 0.05, not different (two-tailed t-test).

^c Relative rates are for LNCaP cells.