Degradation of glycated hemoglobin. Role of erythrocytic proteolytic enzymes and oxidant damage

Chaerkadi Raghothama, Pragna Rao

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Glycated hemoglobin can be degraded by proteolytic enzyme(s) in the erythrocyte. The enzyme(s) co-elutes with glycated hemoglobin when the latter is separated from erythrocyte lysates using the cation-exchanger Bio Rex-70. A further purification of the Bio Rex eluant on DEAE Sephadex A-50 separated the enzyme(s) from glycated hemoglobin. Studies with the Bio Rex eluant showed that degradation of glycated hemoglobin is maximum at 37°C at pH 8.6. Proteolytic degradation is inhibited by 5 mM N-ethylmaleimide (NEM), 5 mM ethylenediamine tetraacetic acid (EDTA) and 0.6 mM n-p-tosyl-L-lysine choromethyl ketone (TLCK) (100, 87 and 76% inhibition respectively). This study also examines the possibility that oxidative damage to glycated hemoglobin increases its susceptibility to proteolytic degradation. When incubated with various anti-oxidants like DTPA, uric acid, mannitol and butylated hydroxy toluene (BHT), proteolytic degradation of glycated hemoglobin decreased by 66.1, 50.7 and 38% respectively.

Original languageEnglish
Pages (from-to)13-25
Number of pages13
JournalClinica Chimica Acta
Volume264
Issue number1
DOIs
Publication statusPublished - 08-08-1997

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Glycosylated Hemoglobin A
Oxidants
Peptide Hydrolases
Degradation
ethylenediamine
Erythrocytes
Pentetic Acid
Ethylmaleimide
Toluene
Mannitol
Enzymes
Uric Acid
Ketones
Lysine
Purification
Cations
Acids

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Clinical Biochemistry

Cite this

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abstract = "Glycated hemoglobin can be degraded by proteolytic enzyme(s) in the erythrocyte. The enzyme(s) co-elutes with glycated hemoglobin when the latter is separated from erythrocyte lysates using the cation-exchanger Bio Rex-70. A further purification of the Bio Rex eluant on DEAE Sephadex A-50 separated the enzyme(s) from glycated hemoglobin. Studies with the Bio Rex eluant showed that degradation of glycated hemoglobin is maximum at 37°C at pH 8.6. Proteolytic degradation is inhibited by 5 mM N-ethylmaleimide (NEM), 5 mM ethylenediamine tetraacetic acid (EDTA) and 0.6 mM n-p-tosyl-L-lysine choromethyl ketone (TLCK) (100, 87 and 76{\%} inhibition respectively). This study also examines the possibility that oxidative damage to glycated hemoglobin increases its susceptibility to proteolytic degradation. When incubated with various anti-oxidants like DTPA, uric acid, mannitol and butylated hydroxy toluene (BHT), proteolytic degradation of glycated hemoglobin decreased by 66.1, 50.7 and 38{\%} respectively.",
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Degradation of glycated hemoglobin. Role of erythrocytic proteolytic enzymes and oxidant damage. / Raghothama, Chaerkadi; Rao, Pragna.

In: Clinica Chimica Acta, Vol. 264, No. 1, 08.08.1997, p. 13-25.

Research output: Contribution to journalArticle

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AU - Rao, Pragna

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AB - Glycated hemoglobin can be degraded by proteolytic enzyme(s) in the erythrocyte. The enzyme(s) co-elutes with glycated hemoglobin when the latter is separated from erythrocyte lysates using the cation-exchanger Bio Rex-70. A further purification of the Bio Rex eluant on DEAE Sephadex A-50 separated the enzyme(s) from glycated hemoglobin. Studies with the Bio Rex eluant showed that degradation of glycated hemoglobin is maximum at 37°C at pH 8.6. Proteolytic degradation is inhibited by 5 mM N-ethylmaleimide (NEM), 5 mM ethylenediamine tetraacetic acid (EDTA) and 0.6 mM n-p-tosyl-L-lysine choromethyl ketone (TLCK) (100, 87 and 76% inhibition respectively). This study also examines the possibility that oxidative damage to glycated hemoglobin increases its susceptibility to proteolytic degradation. When incubated with various anti-oxidants like DTPA, uric acid, mannitol and butylated hydroxy toluene (BHT), proteolytic degradation of glycated hemoglobin decreased by 66.1, 50.7 and 38% respectively.

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