Hasil Pencarian  ::  Simpan CSV :: Kembali

"

Bacillus spp. berpotensi sebagai agen biokontrol untuk meminimalisir kontaminasi mikroorganisme. Tujuan dari penelitian ini adalah untuk mengetahui aktivitas antagonistis sel dan filtrat Bacillus siamensis LDR terhadap beberapa spesies kapang. Purifikasi dan karakterisasi morfologi dilakukan pada medium PDA. Uji aktivitas antagonistis dilakukan dengan metode dual kultur dan uji antibiosis dilakukan dengan menggunakan filtrat fermentasi B. siamensis LDR yang diperoleh dari panen hari ke-12 dan ke-14. Persentase inhibisi ditentukan berdasarkan perhitungan pertumbuhan radial dan biomassa kapang yang diberi perlakuan, dibandingkan dengan kontrol. Hasil uji antagonistis menunjukkan bahwa Fusarium oxysporum, Aspergillus flavus AHM, dan Aspergillus clavatus ABH berhasil dihambat sebesar 35,92%, 42.75%, 27.18% pada teknik dual disc dan sebesar 92.94%, 87.15%, 85.45% pada teknik pour plate disc. Hasil uji antibiosis menunjukkan inhibisi F. oxysporum, A. flavus AHM, dan A. clavatus ABH lebih tinggi pada filtrat 14 hari, yaitu 41.84—41,94%, 34,83—36,04%, 63.27—63,81% pada medium PDA dan 53,15—76,37%, -151— -11.01, 88.87—90.36% pada medium PDB. Sel dan filtrat B. siamensis LDR memiliki aktivitas antagonistis terhadap Fusarium oxysporum, Aspergillus flavus AHM, dan Aspergillus clavatus ABH dengan ketidakstabilan aktivitas antibiosis terhadap A. flavus AHM, secara in vitro.

 

---

Bacillus spp. are potential biocontrol agent to reduce crop contamination by microorganism. Aim of this research is to screen antagonistic activity of B. siamensis LDR cells and filtrate against few species of filamentous fungi. Purification and morphological characterization were done on PDA. Screening of antagonistic activity was done by antagonistic assay using dual culture method and antibiosis assay using 12 and 14 days fermentation filtrate of B. siamensis LDR. Percentage of inhibition were determined by comparing radial growth and biomass of treated fungi to untreated fungi as control. Result of antagonistic assay showed Fusarium oxysporum, Aspergillus flavus AHM, and Aspergillus clavatus ABH were inhibited for 35,92%, 42.75%, 27.18% by using dual disc technique and 92.94%, 87.15%, 85.45% by using pour plate disc technique, respectively. Result of antibiosis assay showed the highest inhibition activity against F. oxysporum, A. flavus AHM, A. clavatus ABH was found in 14 days fermentation filtrate, which were 41.84—41,94%, 34,83—36,04%, 63.27—63,81% on PDA and 53,15—76,37%, -151— -11.01, 88.87—90.36% on PDB, respectively. Therefore, B. siamensis LDR cell and filtrate has antagonistic activity against Fusarium oxysporum, Aspergillus flavus AHM and Aspergillus clavatus ABH, despite of unstable antibiosis activity against A. flavus AHM, in vitro.

 

"

"Mesenchymal Stem cells (MSCs) endometrium dengan marka spesifik SUSD2 berpotensi menjadi salah satu sumber sel yang menginisiasi lesi ektopik pada endometriosis. MSCs pada ektopik (EK) dan eutopik endometrium (EU) pasien endometriosis diketahui memiliki karakteristik yang lebih invasif,, di antaranya dengan ekspresi indoleamine 2,3 dioxygenase (IDO1) yang lebih tinggi dibandingkan endometrium normal (EN). IDO1 menekan ekspresi p53, protein terkait apoptosis, menyebabkan viabilitas sel endometriosis meningkat. Oktil galat merupakan senyawa pleiotropik yang terbukti mampu menginduksi apoptosis pada sel endometriosis melalui pengamatan mikroskop konfokal. Penelitian ini bertujuan untuk mengetahui pengaruh OG terhadap ekspresi SUSD2 dan jalur antiapoptosis sel melalui IDO1. Bahan biologis tersimpan sel endometriosis positif marka MSCs CD73, CD90, dan CD105 digunakan dalam penelitian. Ekspresi protein SUSD2 diinvestigasi dengan flowcytometry. Ekspresi mRNA IDO1 dan caspase3 diinvestigasi dengan real time RT-PCR. Hasil menunjukkan gambaran penurunan ekspresi SUSD2 pasca-pemberian OG. Terdapat gambaran peningkatan mRNA IDO1 tanpa diikuti penurunan mRNA caspase3 pada EK dan EN, namun tidak pada EU. Kesimpulan penelitian ini adalah oktil galat diduga menginduksi apoptosis, tetapi tidak melalui jalur antiapoptosis IDO1.

---

Endometrial mesenchymal stem cells (MSCs) with specific marker SUSD2 is potential to be the sources of the cells that initiate ectopic lesions in endometriosis. MSCs in ectopic (EC) and eutopic endometrium (EU) of endometriosis patients were known to have more invasive characteristics, including higher expression of indoleamine 2,3 dioxygenase (IDO1) than normal endometrium (EN). IDO1 suppresses p53 expression, a protein associated with apoptosis, causing increased endometriosis cell viability. Octyl gallate is pleiotropic compound that has been shown to induce apoptosis in endometriosis cells as seen by confocal microscopy observation. This study aims to determine the effect of OG on the expression of SUSD2 and cell antiapoptotic pathway through IDO1. Stored biological material of endometriosis cell with positive MSCs markers CD73, CD90, and CD105 was used in the study. SUSD2 protein expression was investigated by flowcytometry. IDO1 and caspase3 mRNA expression were investigated with real time RT-PCR. Results showed a trend of decreased SUSD2 expression post-OG administration. There was a trend of increased IDO1 mRNA, but was not followed by a trend of decreased caspase3 mRNA in EK and EN. The conclusion of this study is octyl gallate was suspected to induce apoptosis through a mechanism other than IDO1 antiapoptotic pathway."