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  1. Article ; Online: Protective Properties of Botanical Extracts against 5G Radiation-induced Damage to Human Skin, as Demonstrated in Preliminary Data from a Keratinocyte Cell Culture Model.

    Havas, Fabien / Cohen, Moshe / Krispin, Shlomo / Attia-Vigneau, Joan

    Frontiers in bioscience (Landmark edition)

    2024  Volume 29, Issue 1, Page(s) 31

    Abstract: Background: Next-generation 5G communication technology involves increasing use of 3-100 GHz wireless bands in population centers. Though still non-ionizing, this implies higher radiation energy vs. existing bands. The range is also shorter, needing ... ...

    Abstract Background: Next-generation 5G communication technology involves increasing use of 3-100 GHz wireless bands in population centers. Though still non-ionizing, this implies higher radiation energy vs. existing bands. The range is also shorter, needing more numerous emitters, closer to the user-resulting in higher electromagnetic energy exposure. With no universal consensus regarding exposure risks, there is some concern among the public and the scientific community, following indications that 5G radiation can impact immune function, trigger inflammatory responses, and influence expression of genes affecting protein folding, oxidative stress, tissue/extracellular matrix (ECM) matrix turnover, and more. This work aims at identifying botanical extracts for protection of human skin from these impacts, based on a preliminary cell culture-based model.
    Methods: We irradiated human epidermal keratinocytes at 6 GHz, evaluating effects on Interleukin1-α (IL1-α), a key inflammatory cytokine; TIMP metallopeptidase inhibitor 1 (TIMP1), shown to inhibit collagenase; Angiopoietin-like protein 4 (ANGPLT4), which plays a role in wound healing and epidermal differentiation; and S100 calcium-binding protein A9 (S100A9), involved in immune recruitment during injury, by enzyme-linked immunosorbent assay (ELISA) and immunostaining. We next used this model to identify substances able to mitigate the effects of 5G irradiation, through the evaluation of the influence of treatment by one of several botanical extracts on the observed effects of 5G irradiation.
    Results: After a remarkably short 1-h exposure, clear effects on keratinocyte function were observed: increased inflammatory cytokine IL1-α; reduced collagenase inhibitor TIMP1; increased wound healing/differentiation facilitator ANGPLT4; and increased SA100A9, involved in immune recruitment during injury. On this basis, we then showed the protective effects of selected botanical extracts, capable of reducing the increase in IL1-α induced by 5G exposure, possibly in part due to anti-inflammatory and anti-oxidant properties of compounds present in these extracts.
    Conclusions: Our results show a clear influence of 5G irradiation on the keratinocytes, possibly indicating injury and damage responses. What's more, we showed how these preliminary data can be used to identify botanical extracts capable of offering some protection against these effects for users of 5G technology, e.g., when employed as active ingredients in protective cosmetic applications.
    MeSH term(s) Humans ; Preliminary Data ; Skin ; Keratinocytes/metabolism ; Cytokines/metabolism ; Cell Culture Techniques
    Chemical Substances Cytokines
    Language English
    Publishing date 2024-02-10
    Publishing country Singapore
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2704569-9
    ISSN 2768-6698 ; 2768-6698
    ISSN (online) 2768-6698
    ISSN 2768-6698
    DOI 10.31083/j.fbl2901031
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: A Dunaliella salina Extract Counteracts Skin Aging under Intense Solar Irradiation Thanks to Its Antiglycation and Anti-Inflammatory Properties

    Havas, Fabien / Krispin, Shlomo / Cohen, Moshe / Loing, Estelle / Farge, Morgane / Suere, Thierry / Attia-Vigneau, Joan

    Marine drugs. 2022 Jan. 27, v. 20, no. 2

    2022  

    Abstract: Glycation, and the resulting buildup of advanced glycation end products (AGEs), is recognized as a key driver of cumulative skin damage and skin aging. Dunaliella salina is a halophile microalga adapted to intense solar radiation through the production ... ...

    Abstract Glycation, and the resulting buildup of advanced glycation end products (AGEs), is recognized as a key driver of cumulative skin damage and skin aging. Dunaliella salina is a halophile microalga adapted to intense solar radiation through the production of carotenoids. We present a natural supercritical CO₂ extract of Dunaliella salina rich in the colorless carotenoids phytoene and phytofluene. The extract exhibited antiglycation and anti-inflammatory activities in ex vivo testing, showing strongly reduced formation of N--carboxy-methyl-lysine with exposure to methylglyoxal, reduced AGE receptor levels, and significantly reduced interleukins 6 and 8. In a placebo-controlled clinical study under intense solar exposure, the extract significantly reduced the skin’s glycation scores and its sensitivity to histamine; key skin aging parameters were also significantly improved vs. placebo, including wrinkle counts and spots. These results demonstrate the value of this Dunaliella salina extract, rich in colorless carotenoids, as an antiglycative, anti-inflammatory, and antiaging active ingredient, including in high-irradiation contexts.
    Keywords Dunaliella salina ; active ingredients ; carbon dioxide ; carotenoids ; glycation ; halophiles ; histamine ; interleukins ; microalgae ; placebos ; receptors ; solar radiation
    Language English
    Dates of publication 2022-0127
    Publishing place Multidisciplinary Digital Publishing Institute
    Document type Article
    ZDB-ID 2175190-0
    ISSN 1660-3397
    ISSN 1660-3397
    DOI 10.3390/md20020104
    Database NAL-Catalogue (AGRICOLA)

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  3. Article ; Online: A

    Havas, Fabien / Krispin, Shlomo / Cohen, Moshe / Loing, Estelle / Farge, Morgane / Suere, Thierry / Attia-Vigneau, Joan

    Marine drugs

    2022  Volume 20, Issue 2

    Abstract: Glycation, and the resulting buildup of advanced glycation end products (AGEs), is recognized as a key driver of cumulative skin damage and skin aging. ...

    Abstract Glycation, and the resulting buildup of advanced glycation end products (AGEs), is recognized as a key driver of cumulative skin damage and skin aging.
    MeSH term(s) Adult ; Anti-Inflammatory Agents/pharmacology ; Biological Products/pharmacology ; Double-Blind Method ; Female ; Glycation End Products, Advanced/drug effects ; Histamine/metabolism ; Humans ; Microalgae/chemistry ; Middle Aged ; Skin Aging/drug effects
    Chemical Substances Anti-Inflammatory Agents ; Biological Products ; Glycation End Products, Advanced ; Histamine (820484N8I3)
    Language English
    Publishing date 2022-01-27
    Publishing country Switzerland
    Document type Journal Article ; Randomized Controlled Trial
    ZDB-ID 2175190-0
    ISSN 1660-3397 ; 1660-3397
    ISSN (online) 1660-3397
    ISSN 1660-3397
    DOI 10.3390/md20020104
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Targeting inflammation and pro-resolving mediators with Anetholea anisita extract to improve scalp condition.

    Duroux, Romain / Baillif, Vincent / Havas, Fabien / Farge, Morgane / Maurin, Alban / Suere, Thierry / VanGoethem, Emeline / Attia, Joan

    International journal of cosmetic science

    2022  Volume 44, Issue 6, Page(s) 614–624

    Abstract: Objective: A critical and often-overlooked factor that may give rise to dandruff and oily hair is the intrinsic quality of the scalp stratum corneum (SC), which is often unbalanced and susceptible to external aggressions. Addressing the inflammation ... ...

    Abstract Objective: A critical and often-overlooked factor that may give rise to dandruff and oily hair is the intrinsic quality of the scalp stratum corneum (SC), which is often unbalanced and susceptible to external aggressions. Addressing the inflammation element of unhealthy scalp plays an important role in promoting healthy-looking and feeling hair. Although specialized pro-resolving lipid mediators (SPMs) have been studied in the skin to end the inflammation process and promote tissue regeneration, no studies have been provided in the scalp. This study aims to investigate SPMs expression and its role in improving scalp integrity and consequently improving hair appearance using an Anetholea anisita extract.
    Methods: The effect of Anetholea anisita extract was investigated in vitro on human follicle dermal papilla cells (HFDPC), evaluating its antioxidant and anti-inflammatory properties by fluorescence staining and ELISA, respectively. Ex vivo measurement of the volume of human scalp sebaceous glands was performed using X-ray microtomography (micro-CT). The extract was then clinically tested on a population of dandruff sufferers presenting oily hair. Volunteers' sebum was collected on the scalp and analysed by LC-MS/MS or ELISA to identify SPMs and pro-inflammatory markers. Scalp integrity was assessed by measuring the pH and the TEWL. Sebum production, dandruff and hair gloss were also evaluated.
    Result: Anetholea anisita extract reduced IL-8 and reactive oxygen species (ROS) generation in HFDPC. Interestingly, this extract also decreased the volume of sebaceous glands as revealed by micro-CT. This result was confirmed in vivo by a decrease in sebum production in volunteers. Moreover, SPMs were analysed and detected in the scalp for the first time. An increase in Lipoxin B4 (LxB4) and Resolvin D1 and D2 (RvD1 and RvD2) was observed after Anetholea anisita treatment as well as decrease in pro-inflammatory sebum mediators expression such as PGE2, LTB4 and IL-8. Consequently, the scalp barrier was reinforced as observed through improved transepidermal water loss (TEWL) and skin surface pH, reducing dandruff and improving hair health.
    Conclusion: The present results suggest the potential of cosmetic applications of Anetholea anisita extract to improve scalp health by targeting inflammation pathways to decrease dandruff and improve hair condition.
    MeSH term(s) Humans ; Dandruff ; Scalp/metabolism ; Chromatography, Liquid ; Interleukin-8/metabolism ; Tandem Mass Spectrometry ; Dermatitis, Seborrheic ; Inflammation/drug therapy ; Inflammation Mediators/metabolism ; Plant Extracts/pharmacology
    Chemical Substances Interleukin-8 ; Inflammation Mediators ; Plant Extracts
    Language English
    Publishing date 2022-09-21
    Publishing country England
    Document type Journal Article ; Review
    ZDB-ID 198917-0
    ISSN 1468-2494 ; 0142-5463
    ISSN (online) 1468-2494
    ISSN 0142-5463
    DOI 10.1111/ics.12813
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: Preliminary Data on the Safety of Phytoene- and Phytofluene-Rich Products for Human Use including Topical Application.

    Havas, Fabien / Krispin, Shlomo / Meléndez-Martínez, Antonio J / von Oppen-Bezalel, Liki

    Journal of toxicology

    2018  Volume 2018, Page(s) 5475784

    Abstract: The colorless carotenoids phytoene and phytofluene are comparatively understudied compounds found in common foods (e.g., tomatoes) and in human plasma, internal tissues, and skin. Being naturally present in common foods, their intake at dietary levels is ...

    Abstract The colorless carotenoids phytoene and phytofluene are comparatively understudied compounds found in common foods (e.g., tomatoes) and in human plasma, internal tissues, and skin. Being naturally present in common foods, their intake at dietary levels is not expected to present a safety concern. However, since the interest in these compounds in the context of many applications is expanding, it is important to conduct studies aimed at assessing their safety. We present here results of in vitro cytotoxicity and genotoxicity studies, revealing no significant cytotoxic or genotoxic potential and of short- and long-term human in vivo skin compatibility studies with phytoene- and phytofluene-rich tomato and
    Language English
    Publishing date 2018-04-15
    Publishing country Egypt
    Document type Journal Article
    ZDB-ID 2495098-1
    ISSN 1687-8205 ; 1687-8191
    ISSN (online) 1687-8205
    ISSN 1687-8191
    DOI 10.1155/2018/5475784
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: Bimodal system (luminophore and paramagnetic contrastophore) derived from Ln(III) complexes based on a bipyridine-containing macrocyclic ligand.

    Nasso, Isabelle / Galaup, Chantal / Havas, Fabien / Tisnès, Pierre / Picard, Claude / Laurent, Sophie / Vander Elst, Luce / Muller, Robert N

    Inorganic chemistry

    2005  Volume 44, Issue 23, Page(s) 8293–8305

    Abstract: The synthesis of a new 15-membered polyaza-macrocyclic ligand L3H3, which is based on a 2,2'-bipyridine moiety and a diethylenetriaminetriacetic acid core, is reported. The lanthanide chelates of this octadentate ligand were programmed for bimodal probes, ...

    Abstract The synthesis of a new 15-membered polyaza-macrocyclic ligand L3H3, which is based on a 2,2'-bipyridine moiety and a diethylenetriaminetriacetic acid core, is reported. The lanthanide chelates of this octadentate ligand were programmed for bimodal probes, luminescent agents (Sm, Eu, Tb, Dy), and magnetic resonance imaging agents (Gd3+). The neutral 1:1 complexes with these Ln3+ ions were prepared and studied in aqueous solution by luminescence and NMR techniques. The main photophysical characteristics of these complexes (i.e., the absorption and luminescence spectra, the metal-centered lifetimes, and the overall luminescence yields, Phi) were measured. In addition, the role played by nonradiative pathways (vibrational energy transfer involving coordinated water molecules, involvement of ligand-to-metal charge-transfer excited states, or metal --> ligand back transfer) is discussed. The L3.Eu and L3.Tb complexes show very bright luminescence when photoexcited from the lowest-energy absorption band of the bipyridine chromophore. The luminescence quantum yields in an air-equilibrated water solution at room temperature are 0.10 and 0.21, respectively, despite the presence of one water molecule in the first coordination sphere of the metal ion. NMR data show that L3.Gd contains also one H2O molecule in the inner sphere. The proton longitudinal relaxivity, r1, of this complex is 3.4 s(-1) mM(-1) (0.47 T, 310 K) and the rotational correlation time, tau(R), is 57 ps (310 K). These values are comparable to those of the clinically used Gd-DTPA. Interestingly, the water exchange rate between the coordination site and the bulk solvent is slow (tau(M) = 3.5 micros at 310 K). The presence of water molecules in the second sphere and in rapid exchange with the solvent is discussed. Finally, it was found by luminescence and NMR experiments that these lanthanide complexes are stable versus transmetalation by several cations (especially Ca2+ and Zn2+) at physiological pH and have no interaction with blood proteins.
    Language English
    Publishing date 2005-11-14
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1484438-2
    ISSN 1520-510X ; 0020-1669
    ISSN (online) 1520-510X
    ISSN 0020-1669
    DOI 10.1021/ic0507722
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article: Rational design of lipid for membrane protein crystallization.

    Misquitta, Yohann / Cherezov, Vadim / Havas, Fabien / Patterson, Suzanne / Mohan, Jakkam M / Wells, Angela J / Hart, David J / Caffrey, Martin

    Journal of structural biology

    2004  Volume 148, Issue 2, Page(s) 169–175

    Abstract: The lipidic cubic phase has been used to grow crystals of membrane proteins for high-resolution structure determination. However, the original, so-called, in meso method does not work reliably at low temperatures, where proteins are generally more stable, ...

    Abstract The lipidic cubic phase has been used to grow crystals of membrane proteins for high-resolution structure determination. However, the original, so-called, in meso method does not work reliably at low temperatures, where proteins are generally more stable, because the hosting lipid turns solid. The need existed therefore for a lipid that forms the cubic phase and that supports crystal growth at low temperatures. We created a database of phase diagrams and used it to design such a lipid. X-ray diffraction showed that the new lipid exhibits designed phase behavior. Further, it produces diffraction quality membrane protein crystals by the in meso method at 6 degrees C. This demonstrates that lipidic materials, like their protein counterparts are amenable to rational design. The same approach as used in this study should find application in extending the range of membrane proteins crystallizable by the in meso method and in tailoring transport of cubic phases for controlled delivery and uptake.
    MeSH term(s) Carbon/chemistry ; Crystallization/methods ; Crystallography, X-Ray/methods ; Glycerol/chemistry ; Halobacterium salinarum/metabolism ; Lipids/chemistry ; Membrane Proteins/chemistry ; Protein Conformation ; Temperature ; Water/chemistry ; X-Ray Diffraction
    Chemical Substances Lipids ; Membrane Proteins ; Water (059QF0KO0R) ; Carbon (7440-44-0) ; Glycerol (PDC6A3C0OX)
    Language English
    Publishing date 2004-11
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S. ; Research Support, U.S. Gov't, P.H.S.
    ZDB-ID 1032718-6
    ISSN 1095-8657 ; 1047-8477
    ISSN (online) 1095-8657
    ISSN 1047-8477
    DOI 10.1016/j.jsb.2004.06.008
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article: Modular Approach to the Synthesis of Unsaturated 1-Monoacyl Glycerols

    Coleman, Bridgett E. / Cwynar, Valerie / Hart, David J. / Havas, Fabien / Mohan, Jakkam Madan / Patterson, Suzanne / Ridenour, Sam / Schmidt, Michael / Smith, Eboney / Wells, Angela J.

    Synlett

    2004  Volume 2004, Issue 08, Page(s) 1339–1342

    Abstract: A modular synthesis of unsaturated 1-monoacylglycerols (1) from CIS-1-iodo-1-alkenes [CIS-RCH=CHI] and unsaturated carboxylic acids [CH 2 =CH(CH 2 n CO 2 H] is described. The method revolves around a Suzuki coupling to establish olefin geometry. ...

    Abstract A modular synthesis of unsaturated 1-monoacylglycerols (1) from CIS-1-iodo-1-alkenes [CIS-RCH=CHI] and unsaturated carboxylic acids [CH 2 =CH(CH 2 n CO 2 H] is described. The method revolves around a Suzuki coupling to establish olefin geometry.
    Keywords Suzuki coupling ; 1-monoacylglycerol ; protein crystallization ; diimide reduction ; vinyl iodide
    Language English
    Publishing date 2004-05-18
    Publishing place Stuttgart ; New York
    Document type Article
    ZDB-ID 2042012-2
    ISSN 1437-2096 ; 0936-5214
    ISSN (online) 1437-2096
    ISSN 0936-5214
    DOI 10.1055/s-2004-825616
    Database Thieme publisher's database

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  9. Article: Studies towards a total synthesis of alkaloids manzamine A and cylindrospermopsin and development of a complex example of the Dowd-Beckwith rearrangement

    Havas, Fabien

    Abstract: This dissertation describes efforts towards a total synthesis of manzamine A and cylindrospermopsin, and the development of a novel variant of the Dowd rearrangement. Manzamine A is a marine sponge alkaloid with a complex structure and potentially ... ...

    Abstract This dissertation describes efforts towards a total synthesis of manzamine A and cylindrospermopsin, and the development of a novel variant of the Dowd rearrangement. Manzamine A is a marine sponge alkaloid with a complex structure and potentially valuable biological activity. This thesis describes an approach to a manzamine A substructure involving an asymmetric Birch reductive alkylation of the amide derived from (L)-prolinol methyl ether and 2-methoxybenzoic acid as a key step. Another key step was projected to be a diastereoselective Keck allylation, however a novel Dowd-Beckwith rearrangement occurred instead, producing a substituted 2-oxabicyclo[3.3.0]octan-3,6-dione in good yield. A study of the scope and limitations of this process is described herein. This study illustrated that the rearrangement can be efficient and stereoselective, and culminated in a nontrivial synthesis of a bicyclo[3.3.0]octanone containing three contiguous quaternary stereocenters. Cylindrospermopsin is a highly toxic cyanobacterial guanidinium alkaloid. The work presented herein describes a synthesis of advanced intermediates in a projected synthesis of cylindrospermopsin. Key steps include a Roush crotylation reaction to establish several key stereogenic centers, an intramolecular conjugate addition to form a piperidine ring, a Curtius rearrangement with internal trapping to provide a hexahydroimidazo[1,5-a]pyridine-3-3one, and a Sonogashira coupling to attach the incipient D-ring pyrimidine. Whereas a synthesis was not accomplished, a 14-step synthesis of an intermediate that may serve as a cylindrospermopsin precursor is described.
    Language english
    Document type Article
    Database AGRIS - International Information System for the Agricultural Sciences and Technology

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