Production and Characterization of Monoclonal Antibodies against Human Prostate Specific Antigen.
BACKGROUND
Prostate Specific Antigen (PSA) is an important laboratory marker for diagnosis of prostatic cancer. Thus, development of diagnostic tools specific for PSA plays an important role in screening, monitoring and early diagnosis of prostate cancer. In this paper, the production and characterization of a panel of murine monoclonal antibodies (mAbs) against PSA have been presented.


METHODS
Balb/c mice were immunized with PSA, which was purified from seminal plasma. Splenocytes of hyperimmunized mice were extracted and fused with Sp2/0 cells. By adding selective HAT medium, hybridoma cells were established and positive clones were selected by ELISA after four times of cloning. The isotypes of produced mAbs were determined by ELISA and then purified from ascitic fluids using Hi-Trap protein G column. The reactivities of the mAbs were examined with the purified PSA and seminal plasma by ELISA and western blot techniques. Furthermore, the reactivities of the mAbs were assessed in Prostate Cancer (PCa), Benign Prostatic Hyperplasia (BPH) and brain cancer tissues by Immunohistochemistry (IHC).


RESULTS
Five anti-PSA mAbs (clones: 2G2-B2, 2F9-F4, 2D6-E8, IgG1/К) and clones (2C8-E9, 2G3-E2, IgG2a/К) were produced and characterized. All mAbs, except 2F9-F4 detected the expression of PSA in PCa and BPH tissues and none of them reacted with PSA in brain cancer tissue in IHC. Besides, all mAbs could detect a protein band around 33 kDa in human seminal plasma in western blot.


CONCLUSIONS
These mAbs can specifically recognize PSA and may serve as a component of PSA diagnostic kit in various biological fluids.
Monoclonal Antibody Research Center, Avicenna Research Institute, ACECR, Tehran, Iran.
Ali Ahmad
AA
Bayat
Monoclonal Antibody Research Center, Avicenna Research Institute, ACECR, Tehran, Iran ; Department of Molecular Medicine, School of Advanced Medical Technologies, Tehran University of Medical Sciences, Tehran, Iran.
Roya
R
Ghods
Monoclonal Antibody Research Center, Avicenna Research Institute, ACECR, Tehran, Iran.
Mahdi
M
Shabani
Monoclonal Antibody Research Center, Avicenna Research Institute, ACECR, Tehran, Iran.
Ahmad Reza
AR
Mahmoudi
Monoclonal Antibody Research Center, Avicenna Research Institute, ACECR, Tehran, Iran.
Omid
O
Yeganeh
Department of Immunology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran.
Hadi
H
Hassannia
Monoclonal Antibody Research Center, Avicenna Research Institute, ACECR, Tehran, Iran.
Ali
A
Sadeghitabar
Monoclonal Antibody Research Center, Avicenna Research Institute, ACECR, Tehran, Iran.
Leila
L
Balay-Goli
Monoclonal Antibody Research Center, Avicenna Research Institute, ACECR, Tehran, Iran.
Farzaneh
F
Noutash-Haghighat
Department of Pathology, Khatam Al Anbia Hospital, Tehran, Iran.
Ali Reza
AR
Sarrafzadeh
Monoclonal Antibody Research Center, Avicenna Research Institute, ACECR, Tehran, Iran.
Mahmood
M
Jeddi-Tehrani
ELISA; Immunohistochemistry; Monoclonal antibody; Prostate specific antigen; Western blot