Hasil Pencarian  ::  Simpan CSV :: Kembali

"Tuberkulosis (TB) disebabkan oleh infeksi kuman Mycobacterium tuberculosis merupakan satu dari sepuluh penyebab kematian tertinggi di dunia yang dapat dicegah melalui vaksinasi. Vaksin BCG sebagai satu-satunya vaksin TB, memiliki beberapa kekurangan, diantaranya tingkat proteksi yang tidak merata di populasi orang dewasa dan kekhawatiran aplikasinya pada populasi imunokompromais, hal ini mendorong dikembangkannya vaksin TB alternatif. PE11 merupakan protein yang bertanggung jawab dalam rekonstruksi komponen lipid dinding sel M. tuberculosis dan berdasarkan analisis in-siliko diketahui memiliki domain pengenalan terhadap antibodi dan MHC-II. Dalam studi ini, gen pe11 dari M. tuberculosis strain Beijing diinsersikan ke dalam plasmid pcDNA3.1, pcDNA3.1-pe11, yang kemudian diuji kemampuannya dalam menginduksi respon imun humoral dan mediator seluler pada mencit Balb/c sebagai bentuk DNA vaksin. Berdasarkan uji western blot, respon imun humoral berupa IgG spesifik terhadap protein rekombinan PE11-His berhasil dikonfirmasi. Selain itu, mediator imun seluler dari splenosit mencit pasca vaksinasi dan pajanan antigen secara in-vitro menunjukkan adanya peningkatan produksi IL-12, IFN-γ dan IL-4 dibandingkan dengan kelompok kontrol, namun tidak terhadap sitokin IL-10.

---

Tuberculosis (TB) caused by infection bacteria Mycobacterium tuberculosis, one of ten causes of death in the world that can be prevented through vaccination. The BCG vaccine, as the only TB vaccine, has several drawbacks, including an uneven level of protection in adult population and risk application in immunocompromised population, this has led to the development of an alternative TB vaccine. PE11 is a protein that is responsible for the reconstruction of the lipid component of the cell wall of M. tuberculosis and based on in-silico analysis is known to have the recognition domain for antibodies and MHC-II. In this study, the pe11 gene from the Beijing strain of M. tuberculosis was inserted into the plasmid pcDNA3.1, pcDNA3.1-pe11, then tested for its ability to induce humoral immune responses and cellular mediators in Balb/c mice as a form of vaccine DNA. Based on the western blot test, the specific IgG humoral immune response to the recombinant protein PE11-His was confirmed. In addition, cellular immune mediators from post-vaccination mice splenocytes and in-vitro antigen exposure showed increased production of IL-12, IFN-γ and IL-4 compared to the control group, but not to the IL-10 cytokine."

"Methicillin resistant Staphylococcus aureus (MRSA) merupakan bakteri yang resisten terhadap antibiotik methicillin dan antibiotik golongan β-laktam lainnya. MRSA adalah patogen umum di rumah sakit dan masyarakat. Isolasi MRSA tidak mudah dilakukan karena seringkali bercampur atau terkontaminasi dengan flora normal seperti coagulase negative Staphylococci (CoNS) yaitu Staphylococcus epidermidis dan Staphylococcus haemolyticus. Studi ini menggunakan metode fenotipik berupa pengamatan morfologi, pengecatan Gram, Uji biokimia, serta kepekaan antibiotik sedangkan uji genotipik (metode molekular) berupa PCR gen nuc dan mec, SCCmec typing, MLST dan sekuensing. Subyek penelitian sebanyak 48 isolat tersimpan di Laboratorium Bakteriologi Molekular, Lembaga Eijkman Jakarta. Diperoleh sebanyak 33 sampel (68.75%) memiliki tipe 5 ccr, 9 sampel (18.75 %) tipe 2 ccr dan 6 sampel (12.5 %) nontypeable. Sequence type (ST) yang dominan pada penelitian ini adalah ST239 (2-3- 1-1-4-4-3) dan merupakan strain yang multidrug resistant dominan. Pada penelitian ini semua isolat MRSA yang berjumlah 48 isolat telah dikonfirmasi memiliki ciri-ciri fenotipik yang sesuai, yaitu Gram positif coccus menyerupai buah anggur, β-hemolisis, oksidase negatif, katalase positif dan koagulase positif. Sifat bakteri MRSA secara genotipik mempunyai gen nuc dan gen mecA positif. Hubungan antara sifat genotipe dan sifat fenotipe MRSA yang terlihat dalam penelitian ini adalah semua isolat MRSA yang multidrug resistant (uji secara fenotipik) juga merupakan sequence type yang dominan di rumah sakit (uji genotipik).

---

Methicillin resistant Staphylococcus aureus (MRSA) is a bacterium that is resistant to the methicillin antibiotics and other β-lactam group antibiotics. MRSA is a common pathogen in hospitals and communities. Isolation of MRSA is not easy to do because it is often mixed or contaminated with normal flora such as coagulase negative Staphylococci (CoNS), namely Staphylococcus epidermidis and Staphylococcus haemolyticus.

This study used phenotypic methods in the form of morphological observations, Gram staining, biochemical tests, and antibiotic sensitivity while genotypic tests (molecular methods) in the form of nuc and mec PCR, SCCmec typing, MLST and sequencing. The research subjects were 48 isolates stored in the Molecular Bacteriology Laboratory, Eijkman Institute Jakarta. Thirty three samples (68.75%) had type 5 ccr, 9 samples (18.75%) type 2 ccr and 6 samples (12.5%) nontypeable. The dominant sequence type (ST) in this study is ST239 (2-3-1-1-4-4-3) and is a multidrug resistant dominant strain.

In this study, all isolates of MRSA, total of 48 isolates, were confirmed to have appropriate phenotypic features, which are Gram positive cocci resembling grapes, β-hemolysis, negative oxidase, positive catalase and positive coagulase. Genotypically all isolates have positive nuc gene and mecA gene. The relationship between genotype features and MRSA phenotype seen in this study is that MRSA isolates that are multidrug resistant (phenotypic test) are also the dominant sequence types in the hospital (genotypic test). "