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"This book primarily focuses on the pathophysiology of ER stress. It introduces the molecular bases of ER stress, the emerging relevance of the ER-mitochondria cross-talk, the signaling pathways engaged and cellular responses to ER stress, including the adaptive Unfolded Protein Response (UPR), autophagy as well as cell death. Next the book addresses the role of ER stress in physiology and in the etiology of relevant pathological conditions, like carcinogenesis and inflammation, neurodegeneration and metabolic disease. The last chapter describes how ER stress pathways can be targeted for therapeutic benefit. Altogether, this book will provide the reader with an exhaustive view of ER stress biology and the latest insights in the role of ER stress in relevant human diseases."

"Latar Belakang: Sindrom metabolik (MetS) melibatkan endoplasmic reticulum stress (ER stress) di dalam patogenesisnya. 6-gingerol diketahui memiliki banyak efek farmakologi yang berpotensi untuk pengobatan MetS. Studi ini bertujuan untuk meneliti efek modulasi 6-gingerol terhadap MetS melalui jalur ER stress dan menentukan dose-response relationship. Metode: Pembuatan model MetS menggunakan tikus Sprague-Dawley jantan yang diberikan diet high-fat high fructose (HFHF) selama 16 minggu dan diinjeksi streptozotocin intraperitoneal dosis 22 mg/kgBB pada minggu ke-8. Dua puluh lima ekor tikus dibagi menjadi kelompok diet standar, kontrol negatif (HFHF) dan 3 kelompok perlakuan yang masing-masing diberikan 6-gingerol dosis 50, 100 dan 200 mg/kgBB selama 8 minggu. Setelah tikus dikorbankan, dilakukan pemeriksaan kadar glukosa darah puasa, HOMA-IR, kolesterol total, HDL, LDL, trigliserida; serta parameter ER stress yaitu GRP78 dan IRE1, serta pemeriksaan histopatologik hati. Hasil: Hasil studi menunjukkan 6-gingerol dapat mengurangi berat badan, menurunkan glukosa darah puasa, memperbaiki resistensi insulin, menurunkan kadar kolesterol total, LDL dan trigliserida serta mengurangi secara signifikan akumulasi lipid dan apoptosis hepatosit (p<0,05). Perbaikan terhadap kelainan metabolik tersebut terjadi melalui downregulasi ekspresi protein GRP78 dan IRE1 pada pemberian dosis 200mg/kgBB secara bermakna (p<0,05).Kesimpulan: Studi ini berhasil membuktikan efek modulasi 6-gingerol pada sindrom metabolik secara dose-dependent melalui jalur ER stress.

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Background: Metabolic syndrome (MetS) implicates ER stress in its pathogenesis. 6-gingerol is known to have many potential pharmacological effects for treating MetS. This study aims to investigate the modulating effect of 6-gingerol on MetS via the ER stress pathway and determine the dose-response relationship.

Methods: To induce MetS, male Sprague-Dawley rats were fed high-fat high fructose (HFHF) diet for 16 weeks and injected with low-dose intraperitoneal streptozotocin (22 mg/kg BW) at week 8. Twenty-five rats were divided into a standard diet group, negative control (HFHF), and three treatment groups with 6-gingerol doses of 50, 100, and 200 mg/kg BW for eight weeks, respectively (given after eight weeks of induction). At the end of the study, all rats were sacrificed. Then the following tests were carried out, including fasting blood glucose, HOMA-IR, total cholesterol, HDL, LDL, and triglyceride levels; and ER stress parameters (GRP78 and IRE1), also a histopathological examination of liver.

Results: 6-gingerol can reduce body weight, lower fasting blood glucose and improve insulin resistance, reduce total cholesterol, LDL, and triglyceride levels, and significantly reduced lipid accumulation and apoptosis in hepatocytes (p<0,05). Improvement of these metabolic abnormalities occurred through downregulation of GRP78 protein expression, IRE1 (dose of 200 mg/kgBW) significantly (p<0.05).

Conclusion: This study proved the modulating effect of 6-gingerol on metabolic syndrome in a dose-dependent manner through the ER stress pathway. "

"Belum banyak studi mempelajari keterkaitan antara defisiensi vitamin B12 dan toksisitas homosistein. Hiperhomosisteinemia dikaitkan dengan penyakit selular terkait NAFLD. Toksisitas homosistein dapat berupa steatosis atau inflamasi sel hati. H. sabdariffa. dan konstituen aktifnya memiliki efek pencegahan terhadap cedera seluler. Ekstrak H. sabdariffa. diuji pada tikus Sprague-Dawley (SD) dalam penelitian ini.Penelitian ini untuk melihat efek H.sabdariffa terhadap peningkatan homosistein pada hati tikus SD yang diberikan diet resriksi vitamin B12.Penelitian ini merupakan penelitian in vivo yang dilakukan di Fakultas Kedokteran Universitas Indonesia. Sebanyak 30 ekor tikus SD dibagi menjadi enam kelompok sesuai waktu perlakuan di 8 dan 16 minggu sebagai berikut: Kelompok kontrol diberikan diet standar AIN-93M, kelompok restriksi vitamin B12 diberi diet AIN-93M dengan modifikasi pengurangan komponen vitamin B12 dan kelompok restriksi vitamin B12 diberi AIN-93M dengan modifikasi pengurangan komponen vitamin B12 ditambah ekstrak etanol H.sabdariffa (HSE). Setelah 8 dan 16 minggu, kadar vitamin B12 dan homosistein diukur. Peningkatan aktivitas toksisitas homosistein dilihat dari ekspresi protein GRP78, SREBP1c dan NF-kB. Aktivitas hepatoprotektif HSE dinilai menggunakan AST, ALT, GGT, dan NAFLD Activity Score (NAS).Kadar vitamin B12 pada 8 minggu (233 ± 10.8 vs 176 ± 5.4 pg/L; p < 0.001) dan 16 minggu (226 ± 13 vs 190 6 pg/L; p < 0,001), lebih tinggi secara bermakna pada kelompok restriksi vitamin B12 dengan diet HSE dibandingkan kelompok diet restriksi vitamin B12 tanpa HSE. Kadar plasma homosistein plasma lebih rendah secara bermakna pada kelompok restriksi vitamin B12 dengan HSE dibandingkan kelompok restriksi vitamin B12 tanpa HSE di usia perlakuan 8 minggu (2,25 ± 0,07 vs 2,63 ± 0,1 mol/L; p < 0,001) dan 16 minggu (2,18 ± 0,07 vs 2,64 ± 0,09 mol/L; p < 0,001). Aktivitas GGT plasma di usia 16 minggu perlakuan menurun secara bermakna pada kelompok restriksi vitamin B12 dengan HSE dibandingkan kelompok restriksi vitamin B12 tanpa HSE (14,5 ± 1,1 vs 22,9 ± 2,4 IU; p < 0,05). Ekspresi protein GRP78, SREBP1c, dan NfKB diukur menggunakan protein GADPH sebagai kontrol internal. Pada minggu ke-8 dan 16, ekspresi protein NF-kB lebih rendah pada kelompok restriksi vitamin B12 dengan HSE dibandingkan dengan grup restriksi vitamin B12 tanpa HSE (0,78 ± 0,08 vs 1,08 ± 0,06; p < 0,05). Ekspresi protein SREBP1c lebih rendah pada kelompok restriksi vitamin B12 dengan HSE dibandingkan dengan grup restriksi vitamin B12 tanpa HSE pada usia perlakuan 16 minggu (0,55 ± 0,03 vs 1,00 ± 0,02; p < 0,05). Kelompok restriksi vitamin B12 dengan HSE memiliki gambaran histopatologis steatosis, inflamasi, dan fibrosis lebih baik dibandingkan kelompok yang restriksi vitamin B12 tanpa HSE setelah 16 minggu perlakuan.Disimpulkan peningkatan homosistein akibat diet restriksi vitamin B12 pada tikus SD menyebabkan steatosis hati, inflamasi, dan fibrosis. Ekstrak etanol H.Sabdariffa memiliki efek pencegahan terhadap kondisi steatosis, inflamasi dan fibrosis akibat peningkatan homosistein pada tikus SD yang diberi diet restriksi vitamin B12.

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There haven't been many studies on the link between vitamin B12 deficiency and homocysteine toxicity. Homocysteine is linked to NAFLD-related cellular disease, and toxicity can manifest as steatosis or inflammation of the liver cells. H. sabdariffa. and its active constituents have a preventive effect against cellular injury. H. sabdariffa extract was tested on Sprague-Dawley (SD) rats with NAFLD in this study. This study aimed to examine the effect of H. sabdariffa on increasing homocysteine ​​in the liver of SD rats fed a vitamin B12 restriction diet.

This research is an in vivo study conducted at the Faculty of Medicine, University of Indonesia. 30 SD rats were divided into six groups based on treatment time at 8 and 16 weeks, with the following treatments: the control group received the standard AIN-93M diet, the vitamin B12 restriction group received the AIN-93M diet with a modified reduction of the vitamin B12 component, and the vitamin B12 restriction + HSE group received the AIN-93M diet with a modified reduction of the vitamin B12 component and an ethanol extract of H. sabdariffa (HSE). After 8 and 16 weeks, vitamin B12 and homocysteine ​​levels were measured. The increase in homocysteine ​​toxicity activity was seen from the expression of GRP78, SREBP1c, and NF-kB proteins. The hepatoprotective activity of HSE was assessed using the AST, ALT, GGT, and NAFLD Activity Score (NAS).

Vitamin B12 levels at 8 weeks (233 ± 10.8 vs 176 ± 5.4 pg/L; p < 0.001) and 16 weeks (226 ± 13 vs 190 6 pg/l; p < 0.001), significantly higher in the HSE group with a vitamin restriction diet. B12. Plasma homocysteine ​​levels were significantly lower in the vitamin B12 restriction group with HSE than in the vitamin B12 restriction group without extract at 8 weeks of age (2.25 ± 0.07 vs. 2.63 ± 0.1 mol/L; p < 0.001 ) and 16 weeks (2.18 ± 0.07 vs. 2.64 ± 0.09 mol/L; p < 0.001). Plasma GGT activity at 16 weeks of treatment decreased significantly in the vitamin B12-restricted group with HSE compared to the vitamin B12-restricted group without HSE (14.5 ± 1.1 vs. 22.9 ± 2.4 IU; p < 0.05). GRP78, SREBP1c, and NfKB protein expressions were measured using GADPH protein as an internal control. At weeks 8 and 16, NF-kB protein expression was lower in the vitamin B12 restriction group with HSE compared to the vitamin B12 restriction group without HSE (0.78 ± 0.08 vs. 1.08 ± 0.06; p < 0 ,05). SREBP1c protein expression was lower in the vitamin B12 restriction group with HSE compared to the vitamin B12 restriction group without HSE at 16 weeks of treatment (0.55 ± 0.03 vs. 1.00 ± 0.02; p < 0.05). The vitamin B12 restriction group with HSE had better histopathological features of steatosis, inflammation, and fibrosis than the vitamin B12 restriction group without HSE after 16 weeks of treatment.

It was concluded that the increase in homocysteine ​​due to dietary restriction of vitamin B12 in SD rats caused liver steatosis, inflammation, and fibrosis. The ethanolic extract of H. Sabdariffa had a preventive effect on steatosis, inflammation, and fibrosis due to increased homocysteine ​​in SD rats fed a vitamin B12 restriction diet."

"This volume brings together experts in the biochemistry, cellular biology, immunology and molecular biology of molecular chaperones and protein-folding catalysts with a focus on the mechanisms of cellular trafficking of these proteins and the role of these variegated trafficking mechanisms in both human and animal health and disease."

"The main aim of this book is to evaluate the concept of stress and provide tools for physicians to identify patients who might benefit from stress management. This will incorporate a detailed description of the physiological and pathophysiological consequences of acute and chronic stress that might lead to cardiovascular disease. The book will aim to critically evaluate interventional research (behavioural and other therapies) and provide evidence based recommendations on how to manage stress in the cardiovascular patient. Our intentions are to define and highlight stress as an etiological factor for cardiovascular disease, and to describe an evidence based "tool box" that physicians may use to identify and manage patients in whom stress may be an important contributing factor for their disease and their risk of suffering cardiovascular complications."

"ABSTRAKDengue merupakan salah satu penyakit serius pada manusia yang disebabkan oleh infeksi virus dengue (DENV). Namun, pengembangan senyawa antiviral DENV sering menghadapi masalah dikarenakan belum ada obat yang efektif menangani semua jenis serotipe DENV. Penghambatan melalui host enzim virus yang terlibat dalam siklus hidup DENV dapat menjadi pendekatan potensial dalam penemuan obat dengue dan juga menghindari resisten antiviral. Host retikulum endoplasma (RE) alpha-gukosidase II adalah salah satu target enzim dalam host RE DENV yang berperan penting dalam pelipatan glikoprotein DENV. Dalam penelitian ini digunakan sekitar 67.609 senyawa bahan alam yang telah diketahui aktivitas biologisnya dari pangkalan data InterBioScreen (IBS) sebagai kandidat inhibitor host RE alpha-gukosidase II. Proses penapisan untuk mendapatkan inhibitor terbaik dilakukan melalui tiga tahap simulasi penambatan molekul yaitu virtual screening, rigid docking, dan flexible docking. Titik farmakofor untuk proses penapisan diperoleh dari analisis Protein-Ligand Interaction Fingerprint (PLIF) menggunakan delapan protein alpha-glukosidase II dengan ligan yang berbeda-beda. Berdasarkan proses penapisan tersebut, sebanyak 32 ligan memiliki nilai Root Mean Square Deviation (RMSD) dan Gbinding yang diinginkan, dan lima ligan memiliki interaksi molekul paling baik untuk menghambat host RE alpha-glukosidase II sebagai target enzim. Sifat farmakologi kelima ligan dianalisis melalui uji ADME-Tox menggunakan perangkat lunak Toxtree, SwissADME, admetSAR, dan pkCSM. Ligan terbaik yaitu STOCK1N-86400 memiliki sifat farmakologi terbaik, interaksi hidrogen terbanyak dengan asam amino penting Asp564, Asp640, dan Met565 pada situs aktif host RE alpha-glukosidase II, dan Gbinding paling rendah dibandingkan standar. Hasil simulasi dinamika molekul juga menunjukkan ligan tersebut stabil pada suhu 310K.

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ABSTRACTDengue is one of the crucial diseases in human caused by dengue virus (DENV) infection. However, the development of DENV antiviral is often facing a problem because no effective drug to treat infection caused by all DENV serotypes. The inhibition of enzyme host of virus involved in DENV life cycle can be a potential approach in dengue drug discovery, and also avoiding antiviral resistance. Host endoplasmic reticulum (ER) alpha-glucosidase II is one of the enzymes target in host DENV ER that plays an important role in the DENV glycoprotein folding. In this research, about 67.609 natural products that have been known for their biological activities were acquired from InterBioScreen (IBS) database as candidate host alpha-glucosidase II inhibitor. The screening process was done by three protocol of molecular docking simulation: virtual screening, rigid docking, and flexible docking. Pharmacophore features in screening were obtained from Protein-Ligand Interaction Fingerprint (PLIF) analysis using eight -glucosidase II proteins with different ligands. Based on that screening process, about 32 ligands have a desirable value of Root Mean Square Deviation (RMSD) and Gbinding, and five ligands have a good molecular interaction to inhibit host ER alpha-glucosidase II as enzyme target. Pharmacological properties of the five ligands were analyzed through ADME-Tox test using Toxtree, SwissADME, admetSAR, and pkCSM software. The best ligand, STOCK1N-86400 has the best pharmacological properties, the highest number of hydrogen interaction with critical amino acids Asp564, Asp640, and Met565 in host ER alpha-glucosidase II active site, and the lower Gbinding from standard. The result of molecular dynamic simulation also showed that ligand is stable at a temperature of 310 K."

"Demam Berdarah Dengue (DBD) adalah penyakit yang disebabkan oleh infeksi virus dengue (DENV). Organisasi Kesehatan Dunia (WHO) telah menyatakan bahwa penyakit ini telah menjadi salah satu masalah kesehatan di dunia, terutama di daerah sub-tropis dan tropis. Namun sampai saat ini obat yang spesifik untuk mengobati penderita DBD yang terinfeksi DENV belum ditemukan. Selain itu, diperkirakan wilayah penyebaran infeksi DENV semakin meluas akibat fenomena global, perubahan iklim dan urbanisasi. Oleh karena itu, penelitian ini bertujuan untuk mencari kandidat obat dari senyawa peptida siklik yang dapat berperan sebagai ligan untuk menghambatenzim α-glucosidase I (Glu I) pada host yang diharapkan dapat mengatasi infeksi dari 5 serotipe DENV. Kandidat obat dari senyawa peptida siklik diperoleh melalui metode simulasi molekuler docking menggunakan software MOE 2014.09, diperoleh 10 senyawa peptida siklik memiliki interaksi yang lebih baik dibandingkan dengan senyawa standar, dengan nilai ΔGBinding diatas -13.0000 Kcal/mol. Senyawa siklo (Cys-Thr-Abu-Gly-Gly-Ala-Arg-Pro-Asp-Phe) merupakan senyawa yang memiliki interaksi paling baik dengan α-Glu I dibandingkan standar dan 9 senyawa peptida siklik lainnya. Selain itu, senyawa tersebut memiliki sifat ADME-Tox yang paling potensial sebagai kandidat obat, diantaranya tidak bersifat toksik, Human Intestila Absorbtion (HIA) positif dan tidak bersifat toksik pada ginjal saat proses eliminasi senyawa obat. Diharapakan hasil yang telah diperoleh dapat dilakukan validasi lebih lanjut dengan menggunakan metode In vitro dan In vivo.

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Dengue Fever (DF) is a disease caused by dengue virus infection (DENV). The World Health Organization (WHO) has stated that the disease has become one of the world's health problems, especially in the sub-tropical and tropical regions. However, until now the specific drug to treat DF patients infected with DENV has not been found. In addition, it is estimated that the spreading area of DENV infection is expanding due to global phenomena, climate change and urbanization. Therefore, this study aims to find drug candidates from cyclic peptide compounds that can act as ligands to inhibit the α-glucosidase I (Glu I) enzyme in the host and are expected to overcome the infection of 5 DENV serotypes. The drug candidates from cyclic peptide compounds were found through molecular docking simulation method using software MOE 2014.09, which obtained 10 cyclic peptide compounds have better interaction than the standard compound, with ΔGBinding value above -13.0000 Kcal/mol. Cyclo (Cys-Thr-Abu-Gly-Gly-Ala-Arg-Pro-Asp-Phe) compound has the best interaction with α-Glu I compared to standard and 9 cyclic peptide compounds. In addition, these compounds have the most potential ADME-Tox properties as drug candidates, including non-toxic, positive Human Intestile Absorption (HIA) and not toxic to the kidneys during the process of eliminating drug compounds. It is hop"