Pseudo-disesquiterpenoids from seeds of Vernonia anthelmintica and their biological activities

Publication date: September 2017 Source:Phytochemistry Letters, Volume 21 Author(s): Ablajan Turak, Zulipiya Maimaiti, HaiRong Ma, Haji Akber Aisa Three new pseudo-disesquiterpenoids, vernodalidimer F – H (1 – 3), which are formed by esterification of two sesquiterpenoids, along with a new sesquiterpenoid (4) and two known sesquiterpeonids (5, 6) were isolated from the seeds of Vernonia anthelmintica. Their structures were elucidated by NMR data. The absolute configurations of 1–3 and 5 were determined by comparison of the experimental and calculated electronic circular dichroism spectra. Cytotoxicity of the isolated compounds against four human tumor cell lines were assayed. 5 exhibited strong cytotoxicity against HCT-15, PC-3, A549 and Hela cells lines with IC50 values of 5.3, 5.6, 6.2, and 8.2μM, respectively. 2 showed non-concentration dependent cytotoxicity against HCT-15, PC-3, and A549 cells lines with inhibition rate of 56.1%, 55.3%, and 50.1%, respectively. 1 and 3 showed moderate cytotoxicity against four cell lines with IC50 values ranging from 12.2±5.1 to 28.6±2.5μM. The influence of melanin content in B16 melanoma cells of 1, 5, and 6 were tested, and they increased melanin content by 43.6%, 28.1%, and 37.0% higher than positive control 8-methoxypsoralen. Graphical abstract
Source: Phytochemistry Letters - Category: Chemistry Source Type: research

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Publication date: Available online 17 August 2019Source: Seminars in Cancer BiologyAuthor(s): Paola Queirolo, Andrea Boutros, Enrica Tanda, Francesco Spagnolo, Pietro QuaglinoAbstractMelanoma has always been described as an immunogenic tumor. Despite that, until 2011 the standard of care in metastatic melanoma was chemotherapy, with low response rates and no clear impact on overall survival. Melanoma was the first cancer type to drive the use of immune-checkpoint inhibitors into clinical practice, which revolutionized the therapeutic paradigm not only in melanoma, but also in an increasing number of tumors. In this review,...
Source: Seminars in Cancer Biology - Category: Cancer & Oncology Source Type: research
Authors: Abdel-Rahman O Abstract Objective: To assess the prognostic impact of socioeconomic status (SES) on the outcome of cases with cutaneous melanoma. Methods: Novel SEER socioeconomic database has been accessed and patients with malignant melanoma of the skin (2000-2015) were reviewed. SES was evaluated through a specialized multi-dimension index and patients were classified into three groups (group 1/2/3) where group 1 has the lowest SES and group 3 has the highest SES. Kaplan-Meier survival estimates were used to evaluate the impact of SES on overall survival and multivariable Cox regression analysis was use...
Source: Journal of Dermatological Treatment - Category: Dermatology Tags: J Dermatolog Treat Source Type: research
We appreciate the interest that Roncati and Piscioli showed in our recent publication, in which we evaluated the risk of sentinel lymph node (SLN) metastases in nonulcerated, T1b melanoma by the new 8th edition American Joint Committee on Cancer (AJCC) staging criteria.1 The authors propose a model of melanoma progression based on the transition from a radial growth phase to a vertical growth phase (VGP) that can predict biologic aggressiveness and propensity to metastasize.
Source: Journal of the American College of Surgeons - Category: Surgery Authors: Tags: Letter Source Type: research
In comparison with the 7th Edition, the 8th Edition of the American Joint Committee on Cancer (AJCC) staging system for melanoma no longer considers the mitotic count in the a or b T1 categorization, but it adopts a sub-stratification based on Breslow depth: T1a ≤ 0.8 mm without ulceration and T1b ≤ 0.8 mm with ulceration or 0.8 to 1 mm with or without ulceration. Skin melanoma can be subdivided by Breslow depth into thin melanoma (≤1 mm) or thick melanoma (>1  mm). According to the AJCC 8th Edition, a and b specifications are assigned based on ulceration and depth, which replace the mitotic count for square millimeter.
Source: Journal of the American College of Surgeons - Category: Surgery Authors: Tags: Letter Source Type: research
este Lebbe Samia Mourah In BRAFV600mut metastatic melanoma, the combination of BRAF and MEK inhibitors (BRAFi, MEKi) has undergone multiple resistance mechanisms, limiting its clinical benefit and resulting in the need for response predicting biomarkers. Based on phase III clinical trial data, several studies have previously explored baseline genomic features associated with response to BRAFi + MEKi. Using a targeted approach that combines the examination of mRNA expression and DNA alterations in a subset of genes, we performed an analysis of baseline genomic alterations involved in MAPK inhibitors’ resista...
Source: Cancers - Category: Cancer & Oncology Authors: Tags: Article Source Type: research
P. M. Luyten Martine J. Jager A high HLA expression in uveal melanoma (UM) is part of the prognostically unfavorable inflammatory phenotype. We wondered whether the presence of soluble HLA (sHLA) in the aqueous humour is associated with clinical, histopathological or genetic tumour characteristics, and represents tumour HLA expression and intratumoural inflammation. Aqueous humour from 108 UM patients was analysed for the presence of sHLA, using a Luminex assay specific for HLA Class I. Clinical and genetic parameters were compared between sHLA-positive and negative eyes. A qPCR analysis was performed on tumour tiss...
Source: Cancers - Category: Cancer & Oncology Authors: Tags: Article Source Type: research
ConclusionOur initial results show that the videoscopic inguinal lymphadenectomy is an attractive alternative to the conventional open technique. The number of complications is comparable with the complication rate reported for the conventional open procedure, but they are less severe and there is no need for a surgical re-intervention.
Source: European Journal of Surgical Oncology (EJSO) - Category: Surgery Source Type: research
Authors: Rtshiladze MA, Stretch JR, Scolyer RA, Guitera P PMID: 31414490 [PubMed - as supplied by publisher]
Source: Medical Journal of Australia - Category: General Medicine Tags: Med J Aust Source Type: research
Conclusions: Whereas in myelodysplastic syndrome predominantly missense SRSF2 mutations are described, the observed SRSF2 mutations in UM are all in-frame deletions of 8–9 amino acids. This suggests that the R625 missense SF3B1 mutations and SRSF2 mutations in UM are different compared to the spliceosome gene mutations in hematological cancers, and probably target a different, as yet unknown, set of genes involved in uveal melanoma etiology.
Source: Cancers - Category: Cancer & Oncology Authors: Tags: Communication Source Type: research
We describe a case series of nine patients with metastatic melanoma and injectable lesions who developed progressive disease under a PD-1 inhibitor monotherapy. At the time of progressive disease, patients received intratumoral IL-2 treatment in addition to PD-1 inhibitor therapy. Three patients showed complete, three patients partial response and three patients progressive disease upon this combination therapy. IHC stainings were performed from metastases available at baseline (start of PD-1 inhibitor) and under combination therapy with IL-2. IHC results revealed a significant increase of CD4+ and CD8+ T cells and a highe...
Source: Cancer Immunology, Immunotherapy - Category: Cancer & Oncology Source Type: research
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