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Dive into the research topics where Elizabeth A. Widjaja is active.

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Featured researches published by Elizabeth A. Widjaja.


Bioorganic & Medicinal Chemistry | 2013

(+)-Altholactone exhibits broad spectrum immune modulating activity by inhibiting the activation of pro-inflammatory cytokines in RAW 264.7 cell lines.

Tyler A. Johnson; Johann Sohn; Aidan E. Ward; Tanya L. Cohen; Nicholas Lorig-Roach; Haixia Chen; Ronaldo Aloise Pilli; Elizabeth A. Widjaja; Muhammad Hanafi; Leonardus B S Kardono; Puspa D. Lotulung; Kyria Boundy-Mills; Leonard F. Bjeldanes

An evaluation of Indonesian plants to identify compounds with immune modulating activity revealed that the methanolic extract of an Alphonsea javanica Scheff specimen possessed selective anti-inflammatory activity in a nuclear factor-kappa B (NF-κB) luciferase and MTT assay using transfected macrophage immune (Raw264.7) cells. A high-throughput LC/MS-ELSD based library approach of the extract in combination with the NF-κB and MTT assays revealed the styryl lactone (+)-altholactone (2) was responsible for the activity. Compound 2, its acetylated derivate (+)-3-O-acetylaltholactone (3), and the major compound of this class, (+)-goniothalmin (1), were further evaluated to determine their anti-inflammatory potential in the NF-κB assay. Concentration-response studies of 1-3 indicated that only 2 possessed NF-κB based anti-inflammatory activity. Compound 2 reduced the LPS-induced NO production, phosphorylation of IκBα, and the expression of inducible nitric oxide synthase (iNOS) and cyclooxygenase-2 (COX-2) using Western blot analysis. Further studies using qPCR indicated 2 reduced the expression of eight pro-inflammatory cytokines/enzymes (0.8-5.0μM) which included: COX-2, iNOS, IP-10, IL-1β, MCP-1, GCS-F, IL-6 and IFN-β. These results indicated that 2 displays broad spectrum immune modulating activity by functioning as an anti-inflammatory agent against LPS-induced NF-κB signaling. Conversely the selective cytotoxicity and in vivo anti-tumor and anti-inflammatory activity previously reported for 1 do not appear to arise from a mechanism that is linked to the NF-κB immune mediated pathway.


Reinwardtia | 2014

EXPERIMENTAL TAXONOMY OF THE GIGANTOCHLOA ATTER-GIGANTOCHLOA PSEUDOARUNDINACEA COMPLEX

Elizabeth A. Widjaja; R.N. Lester

Gigantochloa pseudoarundinacea, G. robusta, G. atter, G. atroviola-cea and 14 other related Malesian species of bamboos were studied from preserved and living materials. Characters discerned by morphology, anatomy, chromatography and electrophoresis were analysed by numerical taxonomy. Most of the data indicated that the four species named above were distinct although closely related. The relationships of the remaining species were more complex, but the integrity of each species was established.


Reinwardtia | 1997

New taxa in Indonesian bamboos

Elizabeth A. Widjaja


Reinwardtia | 2014

A REVISION OF MALESIAN GIGANTOCHLOA (POACEAE - BAMBUSOIDEAE)

Elizabeth A. Widjaja


Reinwardtia | 2014

MORPHOLOGICAL, ANATOMICAL AND CHEMICAL ANALYSES OF AMORPHOPHALLUS PAEONIIFOLIUS AND RELATED TAXA

Elizabeth A. Widjaja; R.N. Lester


Reinwardtia | 2003

New Species of bamboos (Poaceae-Bambusoideae) from Bali

Elizabeth A. Widjaja; Inggit Pudji Astuti; Ida Bagus Ketut Arinasa


Reinwardtia | 2009

A NEW SPECIES OF FREYCINETIA (PANDANACEAE) FROM JAMBI, SUMATRA, INDONESIA

Elizabeth A. Widjaja; Nursahara Pasaribu; Arief Hidayat


BERITA BIOLOGI | 2006

PELAJARAN TERPETIK DARI MENDALAMI BAMBU INDONESIA UNTUK PENGEMBANGANNYA DI MASA DEPAN

Elizabeth A. Widjaja


Reinwardtia | 2018

NOMENCLATURAL STUDY OF TETRASTIGMA LEUCOSTAPHYLUM AND TETRASTIGMA RAFFLESIAE (VITACEAE): TWO COMMON HOSTS OF RAFFLESIA IN SUMATRA

Yeni Rahayu; Tatik Chikamawati; Elizabeth A. Widjaja


The Gardens' Bulletin, Singapore | 2017

A noteworthy Dendrocalamus (Poaceae: Bambusoideae) from Sumatra, Indonesia

I Putu Gede P. Damayanto; Elizabeth A. Widjaja; Present address Rt; Rw

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Arief Hidayat

Indonesian Institute of Sciences

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Nursahara Pasaribu

University of North Sumatra

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Hamzah Hamzah

Indonesian Institute of Sciences

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Ida Bagus Ketut Arinasa

Indonesian Institute of Sciences

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Inggit Pudji Astuti

Indonesian Institute of Sciences

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Leonardus B S Kardono

Indonesian Institute of Sciences

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Muhammad Hanafi

Indonesian Institute of Sciences

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Ning Wikan Utami

Indonesian Institute of Sciences

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Puspa D. Lotulung

Indonesian Institute of Sciences

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Sunaryo Sunaryo

Indonesian Institute of Sciences

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