Proteolytic Hydrolysis of the Antitumor Peptide HLDF-6-AA in Blood Plasma


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Abstract

HLDF-6 hexapeptide, which corresponds to the 41TGENHR46 fragment of human leukemia differentiation factor (HLDF), shows a wide range of neuroprotective, normalizing, anxiolytic, nootropic and antitumor activities. A promising drug with antitumor activity is being developed based on the N-acetyl, C‑amide form of HLDF-6 peptide, obtained by the solid phase method. Proteolytic hydrolysis of HLDF-6-AA peptide in blood plasma was studied using its derivatives labeled with hydrogen isotopes. The HLDF-6-AA peptide samples uniformly labeled with tritium and deuterium were obtained by the reaction of high-temperature solid-state catalytic isotope exchange at 170°С. [3H] HLDF-6-AA peptide was obtained with the molar radioactivity of 50 Ci/mmol and the average deuterium incorporation for [2H] HLDF-6-AA peptide was 2.90 atoms per peptide molecule. Proteolytic hydrolysis of HLDF-6-AA peptide in rat blood plasma was studied using radiochromatography. It was established that the main pathway of its proteolytic hydrolysis in rat blood plasma consists in cleavage of His-Arg-NH2 (HR-NH2) dipeptide from the C-end of the amide with the half-degradation period of 35 min.

About the authors

Yu. A. Zolotarev

Institute of Molecular Genetics, Russian Academy of Sciences

Author for correspondence.
Email: zolya@img.ras.ru
Russian Federation, Moscow, 123182

A. K. Dadayan

Institute of Molecular Genetics, Russian Academy of Sciences

Email: zolya@img.ras.ru
Russian Federation, Moscow, 123182

V. S. Kozik

Institute of Molecular Genetics, Russian Academy of Sciences

Email: zolya@img.ras.ru
Russian Federation, Moscow, 123182

S. I. Shram

Institute of Molecular Genetics, Russian Academy of Sciences

Email: zolya@img.ras.ru
Russian Federation, Moscow, 123182

I. Yu. Nagaev

Institute of Molecular Genetics, Russian Academy of Sciences

Email: zolya@img.ras.ru
Russian Federation, Moscow, 123182

V. N. Azev

Shemyakin–Ovchinnikov Institute of Bioorganic Chemistry, Pushchino Branch, Russian Academy of Sciences

Email: zolya@img.ras.ru
Russian Federation, Pushchino, Moscow oblast

A. P. Bogachouk

Shemyakin–Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences

Email: zolya@img.ras.ru
Russian Federation, Moscow, 117997

V. M. Lipkin

Shemyakin–Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences

Email: zolya@img.ras.ru
Russian Federation, Moscow, 117997

N. F. Myasoedov

Institute of Molecular Genetics, Russian Academy of Sciences

Email: zolya@img.ras.ru
Russian Federation, Moscow, 123182

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