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Ovadje P, Chatterjee S, Griffin C, Tran C, Hamm C, Pandey S. Selective induction of apoptosis through activation of caspase-8 in human leukemia cells (Jurkat) by dandelion root extract. JOURNAL OF ETHNOPHARMACOLOGY 2011; 133:86-91. [PMID: 20849941 DOI: 10.1016/j.jep.2010.09.005] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2010] [Revised: 08/16/2010] [Accepted: 09/03/2010] [Indexed: 05/29/2023]
Abstract
AIM OF STUDY Dandelion extracts have been used in traditional Native American Medicine and Traditional Chinese Medicine (TCM) for treatment of leukemia and breast cancer; however, the mechanism of action remains unknown. Today, DRE is mainly marketed for management of gastrointestinal and liver disorders. The current study aims to determine the anti-cancer activity of dandelion root extract (DRE) against human leukemia, and to evaluate the specificity and mechanism of DRE-induced apoptosis. MATERIALS AND METHODS The effect of DRE on cell viability was evaluated using the colorimetric-based WST-1 assay. Apoptotic cell death was monitored by nuclear condensation and confirmed by exposure of phosphatidylserine to outer leaflet of plasma membrane. Activation of caspases was detected using a fluorogenic substrate specific to either caspase-8 or -3. Loss of mitochondrial membrane potential was observed by microscopy using JC-1 dye. The apoptotic effect of DRE was also evaluated on a dominant-negative FADD (Fas-associated death domain) cell line and non-cancerous peripheral blood mononuclear cells (PBMCs). RESULTS Aqueous DRE effectively induces apoptosis in human leukemia cell lines in a dose and time dependent manner. Very early activation of caspase-8 and the subsequent activation of caspase-3 indicate that DRE may be inducing extrinsic or receptor-mediated apoptosis. Caspase inhibition rendered this extract ineffective, thus DRE-induced apoptosis is caspase-dependent. Moreover, the dominant-negative FADD cells that are unable to form a complete DISC (death-inducing signaling complex) were resistant to DRE treatment, which further confirms our hypothesis that DRE induces receptor-mediated apoptosis. Interestingly, non-cancerous peripheral blood mononuclear cells (PBMCs) exposed to aqueous DRE under the same treatment conditions as leukemia cells were not significantly affected. CONCLUSION Our results suggest that aqueous DRE contains components that act to induce apoptosis selectively in cultured leukemia cells, emphasizing the importance of this traditional medicine and thus presents a potential novel non-toxic alternative to conventional leukemia therapy.
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Miyahara-Self E, Tran C, Paz N, Watson A. The Role of S-Cone Signals in the Color-Motion Asynchrony. J Vis 2010. [DOI: 10.1167/10.7.436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Hui Bon Hoa A, Desauw C, Rose C, Tran C. 552 Rétinopathie à gemcitabine chez un patient diabétique. J Fr Ophtalmol 2009. [DOI: 10.1016/s0181-5512(09)73676-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Behr B, Tran C, Kolb B, Nelson J, Wilcox J, Ivakhnenko V. Frequency of Abnormal Hatching in PGD Embryos. Fertil Steril 2008. [DOI: 10.1016/j.fertnstert.2008.02.032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Ivakhnenko V, Tran C, Kolb B, Nelson J, Wilcox J, Behr B. Reduced Oocyte Damage Rates After ICSI With Blunted Needle. Fertil Steril 2008. [DOI: 10.1016/j.fertnstert.2008.02.033] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Tran C, Roulet M, Guex E, Coti Bertrand P. [Pressure ulcers and undernutrition--screening and assessment of nutritional status]. PRAXIS 2008; 97:261-264. [PMID: 18548809 DOI: 10.1024/1661-8157.97.5.261] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Acquired pressure ulcer is associated with significant human, economic and functional consequences. Its prevalence varies between 3 and 23% in a community hospital and between 7 and 54% in an elderly home residency. Pressure ulcer healing is a complex process which involves numerous cellular and molecular mechanisms. An altered nutritional status is a contributing factor in the development of pressure ulcers and the delay in pressure ulcer healing. The key to management of undernutrition is screening and early intervention. According to the gravity of undernutrition, various degrees of intervention will be required. Systematic oral supplementation with various nutrients may provide benefit in the prevention of pressure ulcers, but further studies have to be completed in human subjects prior to being recommended for the treatment of pressure ulcers.
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Antille C, Frei M, Sorg O, Tran C, Kaya G, Masouyé I, Fontao L, Prins C, Saurat JH. Amicrobial Pustulosis of the Folds Associated with Auto-Immune Disorders. Dermatology 2008; 216:324-9. [DOI: 10.1159/000113946] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2007] [Accepted: 09/23/2007] [Indexed: 11/19/2022] Open
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Tran C, Du Pasquier RA, Cavassini M, Guex-Crosier Y, Meuli R, Ciuffreda D, Waeber G. Neuromyelitis optica following CMV primo-infection. J Intern Med 2007; 261:500-3. [PMID: 17444889 DOI: 10.1111/j.1365-2796.2007.01794.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We report the case of an acute optic neuromyelitis with rhabdomyolysis in a 34-year-old immunocompetent transsexual patient following a recent cytomegalovirus (CMV) infection. The combination of optic neuropathy and myelopathy is recognized as Devic's syndrome. Clinical presentation was unusual as the recent CMV infection induced rhabdomyolysis and was the suspected trigger of neuromyelitis.
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Tran C, Ivakhnenko V, Tan T, Behr B. P-954. Fertil Steril 2006. [DOI: 10.1016/j.fertnstert.2006.07.1347] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Tran C, Ivakhnenko V, Tan T, Behr B. P-952. Fertil Steril 2006. [DOI: 10.1016/j.fertnstert.2006.07.1345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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De Matos D, Miller K, Scott R, Tran C, Kagan D, Palmer S. O-198. Fertil Steril 2006. [DOI: 10.1016/j.fertnstert.2006.07.227] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Tran C, Ivakhnenko V, Tan T, Behr B. P-31. Fertil Steril 2006. [DOI: 10.1016/j.fertnstert.2006.02.049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Walwyn WM, Matsuka Y, Arai D, Bloom DC, Lam H, Tran C, Spigelman I, Maidment NT. HSV-1-mediated NGF delivery delays nociceptive deficits in a genetic model of diabetic neuropathy. Exp Neurol 2006; 198:260-70. [PMID: 16427624 DOI: 10.1016/j.expneurol.2005.12.006] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2005] [Revised: 10/19/2005] [Accepted: 12/07/2005] [Indexed: 01/11/2023]
Abstract
A previous phase III clinical trial failed to show significant therapeutic benefit of repeated subcutaneous nerve growth factor (NGF) administration in the treatment of diabetic neuropathy. Animal studies have since shown that site-specific viral-mediated expression of NGF in the lumbar dorsal root ganglia prevents peripheral nerve dysfunction associated with chemically induced neuropathy. Using a Herpes simplex virus expression vector, we have investigated the effect of localized NGF expression in a genetic mouse model of progressive diabetic neuropathy, the +/+ Leprdb mouse. We found that site-specific delivery of NGF initially delayed the appearance of hypoalgesia, assessed by the Hargreaves test, by 1 month and effectively attenuated this deficit for 2 months over the approximately 10 months normal life-span of these animals. Once the disease progressed into its more severe stages, NGF, although still capable of altering the electrophysiological profile of the sensory A- and C-fibers and influencing the expression of p75 and substance P in the dorsal root ganglia, could no longer maintain normal nociception. These data suggest that maximal therapeutic benefit in future NGF-based gene therapy trials will be gained from early applications of such viral-mediated neurotrophin delivery.
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Sorg O, Tran C, Carraux P, Grand D, Hügin A, Didierjean L, Saurat JH. Spectral properties of topical retinoids prevent DNA damage and apoptosis after acute UV-B exposure in hairless mice. Photochem Photobiol 2005; 81:830-6. [PMID: 15760277 DOI: 10.1111/j.1751-1097.2005.tb01450.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We showed in a recent study that topical retinyl palmitate prevented UV-B-induced DNA damage and erythema in humans. Given that retinyl palmitate is a precursor of retinoic acid, the biological form of vitamin A that acts through nuclear receptors, we wondered whether these protective effects toward UV-B exposure were either receptor dependent or linked to other properties of the retinoid molecule such as its spectral properties. We determined the epidermal retinoid profile induced by topical retinoic acid in hairless mice and analyzed its effect on markers of DNA photodamage (thymine dimers) and apoptosis following acute UV-B exposure; we compared these effects to those induced by other natural topical retinoids (retinaldehyde, retinol and retinyl palmitate) which do not directly activate the retinoid receptors. We then analyzed the direct action of these retinoids on UV-B-induced DNA damage and apoptosis in cultured A431 keratinocytes. Topical retinoic acid significantly decreased (approximately 50%) the number of apoptotic cells, as well as the formation of thymine dimers in the epidermis of mice exposed to acute UV-B. Interestingly, the other topical retinoids decreased apoptosis and DNA damage in a similar way. On the other hand, neither retinoic acid nor the other retinoids interfered with the apoptotic process in A431 keratinocytes exposed to UV-B, whereas DNA photodamage was slightly decreased. We conclude that the decrease of apoptotic cells in hairless mouse epidermis following topical retinoids and UV-B irradiation reflects a protection of the primary targets of UV-B (DNA) by a mechanism independent of the activation of retinoid nuclear receptors, rather than a direct inhibition of apoptosis.
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Sorg O, Janer V, Tran C, Masgrau E, Saurat J, Salomon D. P93 - Les lampes flash (intense pulse light) génèrent un stress oxydant cutané mais n’induisent pas de photoproduits de l’ADN. Ann Dermatol Venereol 2005. [DOI: 10.1016/s0151-9638(05)79822-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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Behr M, Ivakhnenko V, Tran C, Tan T. Laser Zona Pellucida Removal (LZPR): We Now Have a Choice. Fertil Steril 2005. [DOI: 10.1016/j.fertnstert.2005.01.041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Yorkgitis EM, Eiss NS, Tran C, Wilkes GL, McGrath JE. Siloxane-modified epoxy resins. ADVANCES IN POLYMER SCIENCE 2005. [DOI: 10.1007/3-540-15546-5_4] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
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Fardeau C, Khlifi H, Rozenbaum O, Tran C, Cassoux N, Bodaghi B, Le Thi Huong-Boutin D, Le Hoang P. 296 Interféron alpha 2a au cours des panuvéites chroniques avec larges précipités rétrocornéens. J Fr Ophtalmol 2005. [DOI: 10.1016/s0181-5512(05)74693-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Kasraee B, Tran C, Sorg O, Saurat JH. The Depigmenting Effect of RALGA in C57BL/6 Mice. Dermatology 2005; 210 Suppl 1:30-4. [PMID: 15724105 DOI: 10.1159/000081499] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND It has been known for a long time that the topical use of retinoic acid (RA) produces mild depigmentation of human skin. However, RA has two major disadvantages for its utilisation as a topical depigmenting compound. First, RA can act as an irritant and can produce considerable erythema and exfoliation of skin. Second, RA has a relatively weak depigmenting ability compared to other known depigmenting chemicals. OBJECTIVE In this study, we show that RALGA, a combination of the less irritant retinoid retinaldehyde (RAL; 0.1%) and glycolic acid (6.4%), has a higher skin-depigmenting potential than RA 0.05% in the tail skin of C57BL/6 mice. This effect was observed in reducing the number of functioning melanocytes and/or in inhibiting their ability to synthesise melanin. In addition, the visually recognisable depigmenting effect of RALGA was evident earlier than that of RA, i.e. only after 1 week of application. RALGA may therefore serve as a depigmenting product for the treatment of skin hyperpigmentary disorders. Postacne hyperpigmented lesions represent a very common pigmentary problem among acne patients. RALGA may thus act as an anti-acne product, due to the presence of RAL--an RA precursor--which could simultaneously remove the postacne hyperpigmented lesions in such patients.
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Sorg O, Tran C, Carraux P, Grand D, Hügin A, Didierjean L, Saurat JH. Spectral Properties of Topical Retinoids Prevent DNA Damage and Apoptosis After Acute UV-B Exposure in Hairless Mice¶. Photochem Photobiol 2005. [DOI: 10.1562/2004-10-01-ra-333r1.1] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Sorg O, Tran C, Carraux P, Grand D, Hügin A, Didierjean L, Saurat JH. Spectral properties of topical retinoids prevent DNA damage and apoptosis after acute UVB exposure in hairless mice. Photochem Photobiol 2005. [DOI: 10.1562/2004-10-01-ra-333] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Tan T, Tran C, Ivakhnenko V, Behr B. Single point determination of day 2 embryos yield comparable implantation rate when compared to sequential assessment. Fertil Steril 2004. [DOI: 10.1016/j.fertnstert.2004.07.067] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Turner L, Dhal B, Hayes J, Mancuso A, Nugent K, Paterson D, Scholten R, Tran C, Peele A. X-ray phase imaging: Demonstration of extended conditions for homogeneous objects. OPTICS EXPRESS 2004; 12:2960-5. [PMID: 19483813 DOI: 10.1364/opex.12.002960] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
We discuss contrast formation in a propagating x-ray beam. We consider the validity conditions for linear relations based on the transport-of-intensity equation (TIE) and on contrast transfer functions (CTFs). From a single diffracted image, we recover the thickness of a homogeneous object which has substantial absorption and a phase-shift of --0.37 radian.
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Antille C, Tran C, Sorg O, Saurat JH. Penetration and Metabolism of Topical Retinoids in ex vivo Organ-Cultured Full-Thickness Human Skin Explants. Skin Pharmacol Physiol 2004; 17:124-8. [PMID: 15087591 DOI: 10.1159/000077238] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2003] [Accepted: 12/22/2003] [Indexed: 11/19/2022]
Abstract
The human epidermis contains endogenous retinoids [retinol (vitamin A) and retinyl esters] and carotenoids (mostly beta-carotene). Previous studies in the mouse have shown that the enzymes involved in retinoid metabolism are present in the epidermis. In this study, we wanted to assess the skin penetration and metabolism of topical retinoids in the human. To do this, fresh surgically excised human abdominal skin was mounted on Franz perfusion cells. Topical retinoic acid, retinal, retinol and retinyl palmitate were applied at 2.5 mg/cm(2) in oil-in-water creams containing 0.05% retinoids on the donor compartment, while the receptor compartment was filled with culture medium. The skin was incubated for 24 h at 37 degrees C, then epidermal retinoid concentrations were determined by HPLC. The same experiment was performed with mouse back skin mounted on Franz cells. Finally, topical retinoids were applied on the back of hairless mice for 24 h; then the mice were sacrificed and retinoid concentrations were assayed in the epidermis. In all three models, retinol and its esters were found to be endogenous, as was the case in previous studies in the mouse in vivo. The four applied retinoids penetrated well into the epidermis. Topical retinoic acid did not increase endogenous retinoids, whereas the latter were greatly increased following topical retinal in the mouse. Retinal was also metabolized into retinoic acid, unlike topical retinol and retinyl palmitate, which only increased endogenous retinoids. Topical retinal and retinol did undergo a higher metabolism in both mouse models than in human skin. In summary, the penetration and metabolism patterns of topical retinoids were quite similar in the two mouse models used, indicating that the Franz cells appear to be a good model to predict in vivo metabolism of topical retinoids. When applying this concept to our results obtained in Franz cells with human skin, we conclude that topical retinol and retinal load human skin with both storage and functional vitamin A.
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Tan T, Tran C, Ivakhnenko V, Behr B. Does the orientation of the first polar body during ICSI affect fertilization and embryo development rates? Fertil Steril 2004. [DOI: 10.1016/j.fertnstert.2004.02.014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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