The role of vitamins and amino acids on hybridoma growth and monoclonal antibody production

Development of a low-serum medium for the production of monoclonal antibody against congenital adrenal hyperplasia by hybridoma culture

Statistically designed experiments were used in developing a low-serum medium for the production of a diagnostic monoclonal antibody against congenital adrenal hyperplasia using hybridoma 192. A two-level half-fractional factorial design was used for screening six components (Minimum Essential Medium Eagle amino acids, 2-mercaptoethanol, ethanolamine, ferric citrate, zinc sulfate, and sodium selenite). The experimental design was then augmented to central composite design. The basal Dulbecco's modified Eagle's medium (DMEM; containing 4 mM L-glutamine, 1% antibiotic-antimycotic agent) supplemented with 0.4% by volume fetal bovine serum (FBS), 311.8 mM ferric citrate, 17.3 nM sodium selenite, and 4.5 mM zinc sulfate (LSD) was found to support the growth of the hybridoma. Specific cell growth rate in the LSD (0.033 ± 0.001/h) was slightly lower than in the control medium (i.e., basal DMEM supplemented with 2% FBS; 0.0045 ± 0.003/h). Nevertheless, the specific MAb production rate for LSD was higher (0.057 ± 0.015 pg/cell · h versus 0.004 ± 0.002 pg/cell · h in LSD and control, respectively). The antibody produced in the LSD showed high specificity and no cross-reactivity with the other structural resemblance's steroid hormones, revealing no structural changes owing to the new medium formulation developed. The new medium formulation effectively reduced the medium cost by up to 64.6%.

Development of optimal medium for production of commercially important monoclonal antibody 520C9 by hybridoma cell

Hybridoma HB-8696 produces monoclonal antibody (mAb) 520C9 (mouse IgG(1)), which recognizes breast cancer oncoprotein c-erbB2. The objective of this study was to optimize the medium recipe of HB 8696 cell for production of mAb 520C9. The optimization consisted of two steps: (1) screening of significant nutrients to make subsequent experiments more efficient with less runs and (2) locating their optimal concentrations. 29 variables including essential and non-essential amino acids, glucose, serum and 6 salts, namely NaCl, KCl, CaCl(2), NaH(2)PO(4), MgSO(4) and Na-pyruvate were chosen in screening phase. The Plackett-Burman method was used to screen the variables influencing mAb production. Seven factors namely glucose, serum, asparagine, threonine, serine, NaCl and NaH(2)PO(4) were identified to have a positive influencing role on mAb production with a confidence level >90 % (p < 0.1). Finally, Response surface methodology revealed the optimal level of the variables. The mAb production and average specific mAb production rate were enhanced by 111.05 and 105 %, respectively, compared to control medium.

Effects of supplementation of various medium components on chinese hamster ovary cell cultures producing recombinant antibody

Thirteen vitamins, twenty amino acids, hormones, inorganic salts, and other chemical agents, which constitute typical serum-free media, were evaluated for the development of fortified medium to enhance cell growth and productivity of recombinant antibody in the cultures of the recombinant Chinese hamster ovary (rCHO) cells. Two different rCHO cell lines, rCHO-A producing recombinant antibodies against the human platelet and rCHO-B secreting recombinant antibodies against the S surface antigen of Hepatitis B, respectively, were cultivated in batch suspension mode. Concentration of interested component in the tested medium was doubled to examine the fortification effect. Growth of rCHO-A cell and its antibody production were slightly improved with addition of either choline chloride, folic acid, thiamine[Symbol: see text]HCl, or Long(TM)R(3)IGF-I. On the other hand, in the cultivation of rCHO-B cell which was more sensitive to its environmental changes, hormones such as Long(TM)R(3)IGF-I and triiodothyronine (T(3)) as well as various vitamins involving choline chloride, i-inositol, niacinamide, pyridoxine HCl, and thiamine[Symbol: see text]HCl enhanced the cell growth and antibody production. Particularly, when concentration of consuming amino acid was doubled, remarkable increase in specific productivity was served, resulting in high final antibody concentration. These results were believed to provide a fundamental strategy of medium fortification useful for improvement of recombinant antibody production in serum-free medium.