Sains Malaysiana 39(2)(2010): 321–327
Penggunaan Kaedah Tindak Balas
Rantai Polimerase dalam Penentuan Prognosis Infeksi Sistemik Kandidiasis pada
Tikus
(Determining
Prognosis of Systemic Candidiasis Infection in Rats with the Polymerase Chain
Reaction Method)
Jacinta Santhanam*, Siti Azura Zainon, Chin Chook Fung & Faezah Shekh Abdullah
Jabatan Sains Bioperubatan, Fakulti
Sains Kesihatan Bersekutu
Universiti Kebangsaan Malaysia, Jalan
Raja Muda Abdul Aziz, 50300 Kuala Lumpur, Malaysia
Diserahkan: 28 April 2009 / Diterima: 4
Ogos 2009
ABSTRAK
Infeksi
kulat sistemik yang paling kerap berlaku pada pesakit hospital adalah infeksi
kandidiasis yang disebabkan oleh Candida spp.
Pendiagnosan infeksi ini melalui pengkulturan dan ujian serologi mengambil masa
ataupun kurang sensitif dan spesifik. Oleh itu, tindak balas rantai polimerase (PCR) yang mengesan DNA kulat
telah diperkembangkan untuk mendapatkan diagnosis yang cepat dan tepat. Dalam
kajian ini, keupayaan asai PCR ‘seminested’
untuk mengesan infeksi sistemik Candida
albicans pada haiwan makmal telah ditentukan. Tikus dewasa Sprague-Dawley
diinfeksi dengan C. albicans secara suntikan intravena sel yis tersebut.
Darah tikus diperolehi setiap 3 atau 4 hari untuk ekstraksi DNA. Setiap minggu, 3 ekor tikus dikorbankan dan organ-organ
dalamannya dikultur untuk memastikan kehadiran infeksi sistemik C. albicans. Tempoh kajian ini adalah selama 4 minggu (28
hari). PCR ‘seminested’ dijalankan ke
atas sampel DNA dengan menggunakan primer
fungus universal, iaitu ITS1 dan ITS3 serta primer spesifik C. albicans (CALB1). Produk PCR yang terhasil dikesan dengan elektroforesis gel agaros. Asai PCR ‘seminested’ berjaya mengesan DNA C. albicans di dalam sampel darah haiwan terinfeksi dari hari
ke-2 sehingga hari ke-25 pos-infeksi secara tekal. Pengkulturan organ ginjal,
hati dan limpa menunjukkan haiwan tersebut diinfeksi secara sistemik sehingga
hari ke-21 pos-infeksi dan telah pulih (keputusan kultur negatif) pada hari
ke-28 pos-infeksi. Kesimpulannya, kajian ini menunjukkan PCR ‘seminested’ adalah satu kaedah yang berupaya mengesan infeksi
sistemik Candida albicans sepanjang tempoh
infeksi. Oleh itu, asai PCR ini
mempunyai nilai sebagai kaedah diagnosis yang berkesan dan juga mampu
menentukan prognosis apabila memantau status infeksi.
Kata kunci:
Candida; infeksi sistemik; prognosis; seminested
ABSTRACT
Candidiasis
infections caused by the fungi Candida spp.
are currently the most common systemic fungal infection in hospitalised
patients. Diagnostic procedures involving culture or serological tests are
either slow or lacking sensitivity and specificity. Thus polymerase chain
reaction (PCR) assays which detect fungal DNA have been developed to provide a rapid, accurate diagnosis. In
this study we evaluated a seminested PCR assay for the detection of systemic Candida albicans infection in laboratory animals. Adult
Sprague-Dawley rats were infected with C. albicans by intravenous
injection of yeast cells. Blood was collected from the animals every 3 to 4
days for extraction of DNA. Each
week, 3 animals were sacrificed and their organs were cultured to confirm
systemic C. albicans infection. The study
period was 4 weeks (28 days). A seminested PCR was performed on DNA samples using universal fungal primers (ITS1 and ITS3) and a C.
albicans specific primer (CALB1).
The PCR product was detected by
agarose gel electrophoresis. The PCR assay was able to detect C. albicans DNA in the blood samples of infected animals consistently from day 2
until day 25 post-infection. Organ culture of kidneys, liver and spleen
revealed that the rats were systemically infected until day 21 post-infection and
had recovered from infection (negative culture results) by day 28
post-infection. This study shows that the seminested PCR was an effective method to detect systemic C. albicans infection throughout the infection period.
Therefore this assay is not only a diagnostic tool but has prognostic value as
well for the monitoring of infection status.
Keywords:
Candida; prognosis; seminested; systemic infection
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*Pengarang untuk surat-menyurat; email:
jacinta@medic.ukm.my