7 research outputs found

    SynthÚse de nouveaux composés N-polyhétéroaromatiques fusionnés basés sur les motifs granulatimide et triazolophthalazine pour leurs propriétés anticancéreuses ou antituberculeuses

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    Le cancer et la tuberculose demeurant deux des principales causes de mortalitĂ© mondiales, le dĂ©veloppement de nouveaux traitements ciblant ces deux pathologies reste un enjeu de santĂ© publique majeur. Dans ce cadre, l'objectif de ma thĂšse a Ă©tĂ© de rĂ©aliser la synthĂšse et l'Ă©valuation antitumorale/antituberculeuse de deux sĂ©ries originales de composĂ©s N-polyhĂ©tĂ©roaromatiques fusionnĂ©s, l'une ayant pour base la granulatimide (1) et l'autre la triazolophthalazine (2). La granulatimide (1) est un alcaloĂŻde naturel reconnu pour inhiber le checkpoint G2, Ă©lĂ©ment clĂ© du processus de rĂ©paration de l'ADN. Au cours de ce travail, nous avons optimisĂ© la prĂ©paration de (1). La synthĂšse de plateformes de diversification de (1) et de son isomĂšre synthĂ©tique l'isogranulatimide C (3) a Ă©tĂ© Ă©tudiĂ©e sur la base de travaux de modĂ©lisation antĂ©rieurs afin d'envisager l'accĂšs Ă  de nouveaux inhibiteurs du checkpoint G2 plus efficaces. Le motif triazolophthalazine (2) a Ă©tĂ© retenue car divers dĂ©rivĂ©s styryltriazolophthalazine (4) ont rĂ©cemment montrĂ© des effets antituberculeux et anticancĂ©reux prometteurs. Au cours de ce travail, nous avons synthĂ©tisĂ© plusieurs sĂ©ries de composĂ©s ayant comme base (2) grĂące Ă  une nouvelle voie de synthĂšse orientĂ©e vers la diversitĂ© et optimisĂ©e pour l'automatisation. Les composĂ©s ainsi synthĂ©tisĂ©s ont pu ĂȘtre testĂ©s pour leur activitĂ© antituberculeuse et/ou anticancĂ©reuse, plusieurs composĂ©s ayant montrĂ© de trĂšs bons rĂ©sultats Ă  la fois vis-Ă -vis de souches de tuberculose sensibles et de souches multi-rĂ©sistantes. Le mode d'action antituberculeux de ces composĂ©s est toujours en cours d'Ă©lucidation mais les rĂ©sultats obtenus jusqu'Ă  prĂ©sent suggĂšrent un mode d'action totalement innovant.Cancer and tuberculosis being still two of the main death causes worldwide, the development of new treatments against these two pathologies remains a major public health stake. In this setting, the purpose of my PhD work was to conduct the synthesis and the antitumoral/antitubercular evaluation of two original series of fused N-polyheteroaromatic compounds, one based on granulatimide (1) and the other on triazolophthalazine (2). Granulatimide (1) is a natural alkaloid beknown for inhibiting checkpoint G2, a key-element in DNA repair processes. During this work, we optimized the preparation of (1). The synthesis of diversification plateforms of (1) and its synthetic isomer isogranulatimide C (3) have been studied on the basis of previous computational work in order to consider the access to new more effective inhibitor of the checkpoint G2. Triazolophthalazine (2) have been chosen as some styryltriazolophthalazine derivatives (4) recently displayed promising antitubercular and anticarcinogenic effects. During this work, we synthesized several series of (2)-based compounds thanks to a new diversity-oriented and automation-compatible route. Thus synthesized compounds have been tested for their antitubercular and/or anticarcinogenic activity, several compounds displaying very good results against both drug-sensitive and multidrug-resistant tuberculosis strains. The antitubercular mode of action of these compounds is still under investigation but results obtained so far tend to indicate a totally innovative mode of action

    Cinnamic Derivatives in Tuberculosis

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    B-Ring-Modified isoCombretastatin A-4 Analogues Endowed with Interesting Anticancer Activities

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    International audienceA novel class of isocombretastatin A‐4 (isoCA‐4) analogues with modifications at the 3â€Č‐position of the B‐ring by replacement with C‐linked substituents was studied. Exploration of the structure–activity relationships of theses analogues led to the identification of several compounds that exhibit excellent antiproliferative activities in the nanomolar concentration range against H1299, MDA‐MB231, HCT116, and K562 cancer cell lines; they also inhibit tubulin polymerization with potency similar to that of isoCA‐4. 1,1‐Diarylethylenes 8 and 17, respectively with (E)‐propen‐3‐ol and propyn‐3‐ol substituents at the 3â€Č‐position of the B‐ring, proved to be the most active in this series. Both compounds led to the arrest of various cancer cell lines at the G2/M phase of the cell cycle and strongly induced apoptosis. Docking of compounds 8 and 17 in the colchicine binding site indicated that their C3â€Č substituents guide the positioning of the B‐ring in a manner different from that observed for isoCA‐4

    Efficient pathway for men fertility preservation in testicular cancer or lymphoma: a cross-sectional study of national 2018 data

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    International audienceIn 15–49 years-old men, the main cancers are testicular cancer (TC) and lymphomas (L): freezing of ejaculated sperm is primarily used for male fertility preservation (FP) before cancer treatment. Our objective was to analyze the French FP rate in 15–49 years-old men diagnosed with TC or L in 2018. We designed a national descriptive cross-sectional study of sperm banking rate in men with a diagnosis of TC, Hodgkin L (HL) or non-Hodgkin L (NHL). From the French National Cancer Institute (INCa) 2018 data, we extracted the estimated incidence of TC and L in metropolitan France. From the 2018 activity report of CECOS network (Centers for Study and Banking of Eggs and Sperm), we extracted the number of men with TC or L who banked ejaculated sperm. We estimated the proportion of 15–49 years-old men diagnosed with TC or L who banked sperm. Results Among 15–49 years-old men, INCa estimated 38,048 new cancer diagnoses in metropolitan France in 2018: 2,630 TC and 3,913 L (943 HL and 2,970 NHL). The CECOS network provided data from 26/27 metropolitan centers (96% response rate): 1,079 sperm banking for men with TC, 375 for HL and 211 for NHL. We estimated that the 2018 sperm banking rate in France was 41% for TC, 40% for HL, and 7% for NHL. Conclusions To our knowledge, our paper is the first cross-sectional study with multicenter and national data analyzing FP rate in cancer men: it suggests an efficient pathway for men to FP before cancer treatment, compared to previously published studies. Although sperm banking rate in 15–49 years-old men could definitely be improved, further studies should evaluate the information given to patients before gonadotoxic treatments, the factors associated with the absence of sperm banking and whether this lack of referral induces a loss of chance for these men.Chez les hommes de 15 Ă  49 ans, les principaux cancers sont le cancer du testicule (CT) et les lymhomes (L): la congĂ©lation de spermatozoĂŻdes Ă©jaculĂ©s est utilisĂ©e en premiĂšre intention pour leur prĂ©servation de fertilitĂ© (PF) avant traitement du cancer. Notre objectif Ă©tait d’analyser le taux de PF chez les hommes de 15 Ă  49 ans diagnostiquĂ©s avec un CT ou un L en 2018 en France. Nous avons rĂ©alisĂ© une Ă©tude nationale transversale descriptive du taux de congelation de spermatozoĂŻdes chez les hommes ĂągĂ©s de 15 Ă  49 ans diagnostiquĂ©s avec un CT, un L de Hodgkin (LH) ou un L non-Hodgkinien (LNH). A partir des donnĂ©es de l’Institut National du Cancer (INCa) de 2018, nous avons extrait l’incidence estimĂ©e de CT et de L en France mĂ©tropolitaine. A partir des donnĂ©es du bilan d’activitĂ© 2018 de la Federation Française des CECOS (Centre d’Etude et de Conservation des Oeufs et du Sperme), nous avons extrait le nombre d’hommes avec un CT ou un L qui ont congelĂ© leurs spermatozoĂŻdes. Nous avons enfin estimĂ© la proportion d’hommes de 15 Ă  49 ans diagnostiquĂ©s avec un CT ou un L qui ont congelĂ© leurs spermatozoĂŻdes. RĂ©sultats Chez les hommes de 15 Ă  49 ans, l’INCa a estimĂ© en 2018 38 048 nouveaux cas de cancers diagnostiquĂ©s en France mĂ©tropolitaine en 2018: 2 630 CT et 3 913 L (943 LH et 2 970 LNH). Le rĂ©seau des CECOS a produit les rĂ©sultats issus de 26/27 centres mĂ©tropolitains (taux de rĂ©ponse de 96%): 1 079 congĂ©lations de sperme pour des hommes atteints de CT, 375 pour LH et 211 pour LNH. Nous avons estimĂ© que le taux de congelation de spermatozoĂŻdes de 2018 en France Ă©tait de 41% pour le CT, 40% pour le LH et 7% pour le LNH. Conclusions A notre connaissance, notre travail est la premiĂšre Ă©tude transversale multicentrique de donnĂ©es nationales analysant le taux de PF chez les hommes atteints de cancer: il suggĂšre un parcours patient efficace pour la PF des hommes avant traitement d’un cancer, par rapport aux Ă©tudes prĂ©cĂ©demment publiĂ©es. Bien que le taux de PF chez les hommes puisse certainemen ĂȘtre amĂ©liorĂ©, des Ă©tudes futures devraient Ă©valuer l’information donnĂ©e aux patients avant traitement gonadotoxique, les facteurs associĂ©s Ă  l’absence de PF et si le dĂ©faut d’adressage au CECOS induit un perte de chance pour ces hommes. Mots-clĂ©s ChimiothĂ©rapie, RadiothĂ©rapie, OncofertiitĂ©, Azoospermia, Paternit
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