TD-1 increases the oxygen affinity of normal human hemoglobin
(Hb)
and whole blood. (A) The ODC of hemoglobin (Hb, 20 μM as tetramer)
without and with TD-1 (120 μM in DPBS, pH 7.4, with 5 vol% DMSO)
at 37 °C. (B) The P50 of hemoglobin mixed without
and with Compound 1 (120 μM) or TD-1 (20, 40, 80, and 120 μM).
(C) Relationship between pH and P50 of hemoglobin (20 μM)
with and without addition of TD-1 (120 μM) in 0.1 M phosphate
buffer (pH 6-8) with 5 vol% DMSO at 37 °C. (D) The ODC of whole
blood without or with TD-1 (40 μM, 2:1 molar ratio to Hb tetramer)
in Hemox solution with 0.8 vol% DMSO at 37 °C. (E) The P50 of whole blood mixed with TD-1 (20, 40, 80, and 120 μM).
Each symbol represents the mean value of P50 measured
in triplicate. (F) The P50 of whole blood mixed with TD-1
(40 μM), 5-HMF, formamidine disulfide, and NEM (all 120 μM).
Each bar represents the mean value of P50 measured in
triplicate. Error bars represent standard deviation.