Structural and functional basis of inositol hexaphosphate stimulation of NHEJ through stabilization of Ku-XLF interaction.

The classical Non-Homologous End Joining (c-NHEJ) pathway is the predominant process in mammals for repairing endogenous, accidental or programmed DNA Double-Strand Breaks. c-NHEJ is regulated by several accessory factors, post-translational modifications, endogenous chemical agents and metabolites. The metabolite inositol-hexaphosphate (IP6) stimulates c-NHEJ by interacting with the Ku70-Ku80 heterodimer (Ku).

Efficacy and Safety of 4.7 mg Deslorelin Acetate Implants in Suppressing Oestrus Cycle in Prepubertal Female Dogs.

Our multicentric, masked, controlled and randomised study aimed to assess the efficacy and safety of Suprelorin® 4.7 mg (Virbac, Carros, France) regarding oestrus prevention in prepubertal intact bitches. Twelve- to eighteen-week-old females (n = 83) were allocated either a deslorelin implant (n = 62) or 0.

Structural Insights into the Intrinsically Disordered GPCR C-Terminal Region, Major Actor in Arrestin-GPCR Interaction.

Arrestin-dependent pathways are a central component of G protein-coupled receptor (GPCRs) signaling. However, the molecular processes regulating arrestin binding are to be further illuminated, in particular with regard to the structural impact of GPCR C-terminal disordered regions. Here, we used an integrated biophysical strategy to describe the basal conformations of the C-terminal domains of three class A GPCRs, the vasopressin V2 receptor (V2R), the growth hormone secretagogue or ghrelin receptor type 1a (GHSR) and the β2-adernergic receptor (β2AR).

Hybridization of Poly(oxazoline) and Poly(ethylene oxide)-Based Amphiphilic Copolymers into Thermosensitive Mixed Micelles of Tunable Cloud Point.

This paper reports the development in aqueous solution of mixed micelles of tunable cloud point temperature through blending in various proportions of two copolymers of different chemical natures. For that purpose, a lipid--poly(2-isopropyl-2-oxazoline) (lipid--P(PrOx)) copolymer, self-assembling into thermosensitive micelles that phase-separate above a cloud point temperature of 38 °C, was blended in various proportions with commercial C--PEO. The latter was constituted of a hydrophobic saturated C chain and a hydrophilic poly(ethylene oxide) (PEO) block with varying polymerization degrees () and does not have any thermosensitive properties on the studied temperature range for any value of .

Measurements of Protein-DNA Complexes Interactions by Isothermal Titration Calorimetry (ITC) and Microscale Thermophoresis (MST).

Interactions between protein complexes and DNA are central regulators of the cell life. They control the activation and inactivation of a large set of nuclear processes including transcription, replication, recombination, repair, and chromosome structures. In the literature, protein-DNA interactions are characterized by highly complementary approaches including large-scale studies and analyses in cells.

Clickable Bambusurils to Access Multivalent Architectures.

Propargylated bambus[4,6]urils were prepared by an efficient one-step condensation of dipropargylglycoluril with formaldehyde under microwave irradiation. Their functionalization by click chemistry (CuAAC) afforded new multivalent architectures decorated with 8 or 12 ligands. Grafting of glycosides provided water-soluble glycobambus[4,6]uril platforms with glucosylBU[6] showing good affinity toward iodide anion in aqueous medium.

XLF and APLF bind Ku80 at two remote sites to ensure DNA repair by non-homologous end joining.

The Ku70-Ku80 (Ku) heterodimer binds rapidly and tightly to the ends of DNA double-strand breaks and recruits factors of the non-homologous end-joining (NHEJ) repair pathway through molecular interactions that remain unclear. We have determined crystal structures of the Ku-binding motifs (KBM) of the NHEJ proteins APLF (A-KBM) and XLF (X-KBM) bound to a Ku-DNA complex. The two KBM motifs bind remote sites of the Ku80 α/β domain.

Single step synthesis and organization of gold colloids assisted by copolymer templates.

We report here an original single-step process for the synthesis and self-organization of gold colloids by simply incorporating gold salts into a solution prepared using polystyrene (PS)-polymethylmethacrylate copolymer and thiolated PS with propylene glycol methyl ether acetate as a solvent. The spin-coating and annealing of this solution then allows the formation of PS domains. Depending on the polymer concentration of the as-prepared solution, there can be either one or several gold nanoparticles (Au NPs) per PS domain.

[Loco-regional persistence and recurrences of operated differentiated thyroid cancers. 22 cases on 589 treated patients from 1964 to 1990, follow-up from 5 to 31 years].

Aim Of The Study: Evaluation of frequency and outcome of loco-regional persistance and recurrences of differentiated thyroid carcinomas after surgery.

Material And Methods: from 1964 to December 1990, we operated and followed up more than 5 years (from 5 to 31 years): 589 thyroid cancers (309 papillary, 262 follicullar et 18 Hürthle cells); 145 patients were lost to follow-up (24%), 33% of them were microcarcinomas. Surgery consisted ultimately in 411 total thyroidectomies, 51 sub-total thyroidectomies, 113 lobectomies with isthmusectomies, 9 isthmusectomies or tumorectomies and 4 tracheotomies.

Transforming growth factor beta 1 is an inducer of erythroid differentiation.

Normal human bone marrow cells, highly enriched for burst-forming units-erythroid (BFU-E), were cultured in serum-free medium, in the presence and absence of various factors, to investigate the mechanisms involved in regulating erythroid differentiation. In cultures containing interleukin 3 (IL-3), Steel factor (SF), and erythropoietin (Ep), benzidine-positive erythroblasts first became detectable on day 6. Their numbers then rapidly increased until, by day 16, > 99% of the cells, which were 20,000-fold amplified over input numbers, were benzidine-positive.

Is it still worthwhile to treat bone metastases from differentiated thyroid carcinoma with radioactive iodine?

From 1964 to 1989, bone metastases were found in 28 of 600 patients operated on for differentiated thyroid carcinoma. Bone metastasis was the presenting symptom in 15 (54%) patients, was detected from the initial symptom in 4 (14.5%) patients, and occurred subsequently in 9 (32%) patients, with an average lag time of 4.

[Recurrence of cervical lymph node involvement in surgically treated thyroid cancer. Uselessness of routine cervical lymph node excision (medullary carcinoma excluded)].

From 1966 throughout September 1990, 753 patients underwent surgery for thyroid carcinoma, in the same institution, covering all pathological types. Complete follow-up was achieved in 96% of them, being at least 7 years in 50% of cases. 599 (80%) are currently alive.

[Decision-making for lymph node excision in surgery of thyroid cancer. Extemporaneous examination of the external supraclavicular lymph nodes].

Unlabelled: Modified neck dissection (MND) is not recommended for surgery of thyroid carcinoma (TC) in the absence of grossly involved nodes, except for medullary thyroid carcinoma, and clinical node recurrence in uncommon at follow-up (3% for us). But several authors report metastatic cancer in non-palpable nodes up to 70% on MND specimens. The fear of overlooking occult metastatic nodes prompted us to sample even normal appearing nodes and to rely on frozen sections (FS) to make a decision whether or not a MND should be done.

[Multi-glandular lesions in primary hyperparathyroidism. Late outcome of 86 consecutive patients treated with conservative surgery].

Multiple gland enlargement (M.G.E.