A validated capillary electrophoresis method to check for batch-to-batch consistency during recombinant human glycosylated interleukin-7 production campaigns.
This work reports the validation of a simple CZE method to be used in quality control of recombinant human glycosylated interleukin-7 (rhIL-7) batches produced in Chinese Hamster Ovary (CHO) cells. The separation buffer was a 25mM sodium borate at pH 10 containing 12mM diaminobutane (DAB) used as a dynamic coating agent of the capillary. This method allowed the separation of seven peaks ranging from low to high sialylated glycoforms. An extensive study on conditioning methods of the capillary has been conducted to yield repeatable results. Excellent RSD of EOF mobility (less than 0.6%) was obtained when conditioning included capillary equilibration under virtual analyses and storage in 0.1M NaOH overnight. Method specificity has been demonstrated to be able to discriminate different rhIL-7 glycoforms produced in CHO from formulation matrix. Linearity was demonstrated between 0.5 and 4mg/mL. LOQ was 0.5mg/mL. Repeatability (RSD<1.4 and 3.3% for t(m) and A%, respectively), intermediate precision of inter-day (RSD<2.1 and 4.5), inter-analyst (RSD<2.0 and 3.0) and inter-equipment (RSD<3.8 and 3.7 for electrophoretic mobility and A%, respectively) were all very satisfactory. Evaluation of robustness revealed that pH and DAB concentration are critical parameters in the method while slight alteration of ionic strength of electrolyte or change of capillary source did not affect the results. Finally the method was shown to provide reliable informations to address comparability studies and batch-to-batch consistency of biomanufactured rhIL-7.
Univ Paris-Sud, Laboratoire de Protéines et Nanotechnologies en Sciences Séparatives (JE 2495), Faculté de Pharmacie, 92296 Châtenay-Malabry, France.
Youssef
Y
Alahmad
Myriam
M
Taverna
Hanane
H
Mobdi
Jérémy
J
Duboeuf
Anne
A
Grégoire
Iann
I
Rancé
Nguyet Thuy
NT
Tran
D000818:Animals; D002021:Buffers; D016466:CHO Cells; D006224:Cricetinae; D003412:Cricetulus; D004355:Drug Stability; D019075:Electrophoresis, Capillary; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism; D006031:Glycosylation; D006801:Humans; D006863:Hydrogen-Ion Concentration; D015851:Interleukin-7 / Q000096:biosynthesis* / Q000592:standards; D015588:Observer Variation; D009994:Osmolar Concentration; D011489:Protein Denaturation; D055550:Protein Stability; D011786:Quality Control; D011994:Recombinant Proteins / Q000096:biosynthesis; D015203:Reproducibility of Results; D013678:Technology, Pharmaceutical / Q000379:methods*
D002021:Buffers; C508605:IL7 protein, human; D015851:Interleukin-7; D011994:Recombinant Proteins