| Sains Malaysiana 45(5)(2016):
          787–793
  
         
             
           Replication of a
            Malaysian Strain Avian Influenza A Virus H5N1 in Madin-Darby Canine Kidney and
            African Green Monkey Kidney Cells
            
           (Replikasi Virus Influenza
            Avian A Jenis H5N1 dalam Sel Ginjal Kanin Madin-Darby dan Monyet Hijau Afrika)
            
           
             
           TOONG SENG TAN1, SHARIFAH SYED HASSAN2 & WEI BOON YAP1*
            
           
             
           1Biomedical Science
            Programme, School of Diagnostic and Applied Health Sciences, Faculty of Health
            Science, Universiti Kebangsaan Malaysia, Jalan Raja Muda Abdul Aziz, 50300 Kuala
            Lumpur, Malaysia
            
           
             
           2School of Medicine and
            Health Sciences, Monash University Malaysia, Jalan Lagoon Selatan
            
           47500 Bandar Sunway,
            Selangor Darul Ehsan, Malaysia
            
           
             
           Diserahkan: 1 September
            2015/Diterima: 17 November 2015
            
           
             
           ABSTRACT
            
           The use of cell lines such as
            Madin-Darby Canine Kidney (MDCK) and African Green Monkey Kidney
            (Vero) cells in influenza vaccine production is much advocated presently as a
            safer alternative to chicken embryonated eggs. It is thus essential to
            understand the influenza virus replication patterns in these cell lines prior
            to utilizing them in vaccine production. The infectivity of avian influenza A virus (A/Chicken/Malaysia/5858/2004) H5N1 in MDCK and Vero cell lines was first assessed by comparing the cytopathic
            effect (CPE) caused by the virus infection. The viral loads in
            both of the infected media and cells were also compared. The results showed
            that both of the MDCK and Vero cells began to exhibit
            significant CPE (p<0.05) after 48 h post-infection (h p.i). The MDCK cell line was more susceptible to the virus infection compared to
            Vero cell line throughout the incubation period. A higher viral load was also
            detected in the host cells compared to their respective culturing media.
            Interestingly, after reaching its maximum titer at 48 h p.i, the viral load in MDCK cells declined meanwhile the viral load in Vero cells increased
            gradually and peaked at 120 h p.i. Overall, both cell lines support efficient
            H5N1 virus replication. While the peak viral loads measured in the two cell
            lines did not differ much, a more rapid replication was observed in the
            infected MDCK samples. The finding showed that MDCK cell
            line might serve as a more time-saving and cost-effective cell culture-based
            system compared to Vero cell line for influenza vaccine production.
  
           
             
           Keywords: Cytopathic effect; H5N1; MDCK;
            Vero; viral load
            
           
             
           ABSTRAK
            
           Penggunaan 
              kultur sel seperti sel ginjal kanin Madin-Darby (MDCK) 
              dan monyet hijau Afrika (Vero) dalam penghasilan vaksin influenza 
              adalah lebih selamat berbanding telur ayam berembrio yang disarankan 
              pada masa ini. Maka, adalah penting untuk kita memahami corak 
              replikasi virus influenza dalam sel-sel tersebut sebelum digunakan 
              dalam penghasilan vaksin. Keboleh-jangkitan 
              virus influenza jenis H5N1 (A/Chicken/Malaysia/5858/2004) dalam 
              sel MDCK dan 
              Vero dinilai dengan membandingkan kesan sitopatik (CPE) 
              yang diakibatkan oleh jangkitan virus influenza. Titer 
              virus dalam media dan sel terjangkit turut dibandingkan. 
              Hasil kajian menunjukkan kedua-dua sel MDCK dan Vero mula mempamerkan CPE 
              yang signifikan (p < 0.05) selepas 48 jam pasca-infeksi 
              (h p.i). Sel MDCK adalah lebih rentan kepada jangkitan 
              virus sepanjang tempoh eraman virus berbanding dengan sel Vero. 
              Titer virus yang lebih tinggi diperoleh dalam sel perumah terjangkit 
              berbanding dengan media kultur. Selepas 
              mencapai titer maksimum pada 48 h p.i, titer virus dalam sel MDCK menurun 
              manakala titer virus dalam sel Vero kekal meningkat secara perlahan 
              dan memuncak pada 120 h p.i. Secara keseluruhan, kedua-dua sel perumah 
              didapati mampu menyokong replikasi virus H5N1 dengan cekap. Meskipun 
              titer virus maksimum yang dicapai antara kedua-dua sel perumah tidak 
              berbeza, replikasi yang lebih pantas diperhatikan dalam sel MDCK. 
              Hal ini mencadangkan penggunaan sel MDCK dalam penghasilan vaksin 
              influenza adalah lebih jimat daripada segi masa dan kos 
              berbanding dengan sel Vero.  
             
           Kata
            kunci: H5N1; kesan sitopatik; MDCK; titer
            virus; Vero
  
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           *Pengarang untuk surat-menyurat; email: yapweiboon@ukm.edu.my     |