@article{
 title = {Loss of α-hemoglobin-stabilizing protein impairs erythropoiesis and exacerbates β-thalassemia},
 type = {article},
 year = {2004},
 pages = {1457-1466},
 volume = {114},
 id = {b699fcb7-add4-3ff6-a946-b7bf6448eaeb},
 created = {2023-01-10T01:46:10.944Z},
 file_attached = {false},
 profile_id = {a5a2ab6f-a8b5-3db6-97bc-618752ee4386},
 group_id = {bc1ab1d4-9e57-37e6-9fb5-435fca0ee9d2},
 last_modified = {2023-01-10T01:46:10.944Z},
 read = {false},
 starred = {false},
 authored = {false},
 confirmed = {false},
 hidden = {false},
 private_publication = {false},
 abstract = {Hemoglobin (Hb) A production during red blood cell development is coordinated to minimize the deleterious effects of free α- and β-Hb subunits, which are unstable and cytotoxic. The α-Hb-stabilizing protein (AHSP) is an erythroid protein that specifically binds α-Hb and prevents its precipitation in vitro, which suggests that it may function to limit free α-Hb toxicities in vivo. We investigated this possibility through gene ablation and biochemical studies. AHSP-/- erythrocytes contained hemoglobin precipitates and were short-lived. In hematopoietic tissues, erythroid precursors were elevated in number but exhibited increased apoptosis. Consistent with unstable α-Hb, AHSP-/- erythrocytes contained increased ROS and evidence of oxidative damage. Moreover, purified recombinant AHSP inhibited ROS production by α-Hb in solution. Finally, loss of AHSP worsened the phenotype of β-thalassemia, a common inherited anemia characterized by excess free α-Hb. Together, the data support a model in which AHSP binds α-Hb transiently to stabilize its conformation and render it biochemically inert prior to Hb A assembly. This function is essential for normal erythropoiesis and, to a greater extent, in β-thalassemia. Our findings raise the possibility that altered AHSP expression levels could modulate the severity of β-thalassemia in humans.},
 bibtype = {article},
 author = {Kong, Y. and Zhou, S. and Kihm, A.J. and Katein, A.M. and Yu, X. and Gell, D.A. and Mackay, J.P. and Adachi, K. and Foster-Brown, L. and Louden, C.S. and Gow, A.J. and Weiss, M.J.},
 doi = {10.1172/JCI21982},
 journal = {Journal of Clinical Investigation},
 number = {10}
}

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The α-Hb-stabilizing protein (AHSP) is an erythroid protein that specifically binds α-Hb and prevents its precipitation in vitro, which suggests that it may function to limit free α-Hb toxicities in vivo. We investigated this possibility through gene ablation and biochemical studies. AHSP-/- erythrocytes contained hemoglobin precipitates and were short-lived. In hematopoietic tissues, erythroid precursors were elevated in number but exhibited increased apoptosis. Consistent with unstable α-Hb, AHSP-/- erythrocytes contained increased ROS and evidence of oxidative damage. Moreover, purified recombinant AHSP inhibited ROS production by α-Hb in solution. Finally, loss of AHSP worsened the phenotype of β-thalassemia, a common inherited anemia characterized by excess free α-Hb. Together, the data support a model in which AHSP binds α-Hb transiently to stabilize its conformation and render it biochemically inert prior to Hb A assembly. This function is essential for normal erythropoiesis and, to a greater extent, in β-thalassemia. Our findings raise the possibility that altered AHSP expression levels could modulate the severity of β-thalassemia in humans.","bibtype":"article","author":"Kong, Y. and Zhou, S. and Kihm, A.J. and Katein, A.M. and Yu, X. and Gell, D.A. and Mackay, J.P. and Adachi, K. and Foster-Brown, L. and Louden, C.S. and Gow, A.J. and Weiss, M.J.","doi":"10.1172/JCI21982","journal":"Journal of Clinical Investigation","number":"10","bibtex":"@article{\n title = {Loss of α-hemoglobin-stabilizing protein impairs erythropoiesis and exacerbates β-thalassemia},\n type = {article},\n year = {2004},\n pages = {1457-1466},\n volume = {114},\n id = {b699fcb7-add4-3ff6-a946-b7bf6448eaeb},\n created = {2023-01-10T01:46:10.944Z},\n file_attached = {false},\n profile_id = {a5a2ab6f-a8b5-3db6-97bc-618752ee4386},\n group_id = {bc1ab1d4-9e57-37e6-9fb5-435fca0ee9d2},\n last_modified = {2023-01-10T01:46:10.944Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {false},\n hidden = {false},\n private_publication = {false},\n abstract = {Hemoglobin (Hb) A production during red blood cell development is coordinated to minimize the deleterious effects of free α- and β-Hb subunits, which are unstable and cytotoxic. The α-Hb-stabilizing protein (AHSP) is an erythroid protein that specifically binds α-Hb and prevents its precipitation in vitro, which suggests that it may function to limit free α-Hb toxicities in vivo. We investigated this possibility through gene ablation and biochemical studies. AHSP-/- erythrocytes contained hemoglobin precipitates and were short-lived. In hematopoietic tissues, erythroid precursors were elevated in number but exhibited increased apoptosis. Consistent with unstable α-Hb, AHSP-/- erythrocytes contained increased ROS and evidence of oxidative damage. Moreover, purified recombinant AHSP inhibited ROS production by α-Hb in solution. Finally, loss of AHSP worsened the phenotype of β-thalassemia, a common inherited anemia characterized by excess free α-Hb. Together, the data support a model in which AHSP binds α-Hb transiently to stabilize its conformation and render it biochemically inert prior to Hb A assembly. 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