Prospective assessment of aneurysmal rupture risk scores in patients with subarachnoid hemorrhage: a multicentric cohort.

PURPOSE: The natural evolution of unruptured intracranial aneurysms (UIA) is indeed difficult to predict at the individual level. OBJECTIVE: In a large prospective multicentric European cohort, we aimed to evaluate whether the PHASES, UCAS, and ELPASS scores in patients with aneurysmal subarachnoid hemorrhage would have predicted a high risk of aneurysmal rupture or growth. METHODS: Academic centers treating patients with intracranial aneurysms were invited to prospectively collect de-identified data from all patients admitted at their institution for a subarachnoid hemorrhage-related to intracranial aneurysmal rupture between January 1 and March 31, 2021 through a trainee-led research collaborative network. Each responding center was provided with an electronic case record form (CRF) which collected all the elements of the PHASES, ELAPSS, and UCAS scores. RESULTS: A total of 319 patients with aneurysmal subarachnoid hemorrhage were included at 17 centers during a 3-month period. One hundred eighty-three aneurysms (57%) were less than 7 mm. The majority of aneurysms were located on the anterior communicating artery (n = 131, 41%). One hundred eighty-four patients (57%), 103 patients (32%), and 58 (18%) were classified as having a low risk of rupture or growth, according to the PHASES, UCAS, and ELAPSS scores, respectively. CONCLUSION: In a prospective study of European patients with aneurysmal subarachnoid hemorrhage, we showed that 3 common risk-assessment tools designed for patients with unruptured intracranial aneurysms would have not identified most patients to be at high or intermediate risk for rupture, questioning their use for decision-making in the setting of unruptured aneurysms.

Comparison between MRI and choline-PET trans-perineal target biopsies and saturation biopsies for detection and topography of intra-prostatic recurrence after primary radiation therapy for prostate cancer.

INTRODUCTION: Biochemical recurrence of prostate cancer after radiation therapy occurs in 5 to 50% of cases depending on the radiation technique used. The diagnosis of recurrence of prostate adenocarcinoma must be made accurately. The aim of this study was to compare transperineal saturation and target biopsies to index lesion (IL) as defined on MRI and 18FCholine PET-CT (PETc) for detection of intra-prostatic recurrence after primary radiation therapy for prostate cancer. MATERIALS AND METHODS: Thirty-eight patients with an history of prostate radiation for prostate cancer and biochemical recurrence were retrospectively included between March 2013 and June 2017. All patients had PETc and multiparametric MRI (MRI) defining IL. All patients had transperineal saturation biopsies and target biopsies the IL. RESULTS: Among 38 patients with biochemical recurrence, 33 (87%) had biopsy proven recurrence in the prostate. The sensitivity and specificity of MRI were 32% (SD:19%) and 91% respectively (SD:7%). The sensitivity and specificity of PETc were 33% (SD:22%) and 78% respectively (SD:12%). Saturation trans-perineal and target biopsies allowed detection of disease recurrence in 79% and 84% of patients, respectively. CONCLUSION: In case of positive imaging, both trans-perineal prostate saturation and target biopsies offer good performance to confirm intraprostatic recurrence. However, MRI and PETc low sensitivity to detect all sites of local recurrence of prostate cancer after radiation still justify the completion of systematic saturation biopsies. LEVEL OF EVIDENCE: 3.

Fifteen novel mutations in the JAGGED1 gene of patients with Alagille syndrome.

Mutations in the human JAGGED1 gene cause Alagille syndrome, an autosomal dominant developmental disorder. The gene encodes a transmembrane protein which is a ligand of Notch receptors. We report 23 mutations in previously undescribed probands, including 15 novel mutations and 8 recurrent mutations. They map in the part of the gene encoding the extracellular part of the protein. Fifteen mutations are frameshifts and 8 are point mutations. They could give rise to truncated proteins (18/23, including 5 nonsense mutations). There are 2 splice defects, and the 3 missense mutations all cause loss or creation of cysteine residues in the Delta-Serrate-Lag2 domain or in EGF repeats. The inheritance was studied in 14 families, including those of 2 probands previously studied. Two mutations were transmitted from the father and 3 from the mother. Nine mutations were de novo, further confirmation that the majority of cases are sporadic.

Effect of low dose rate ionizing radiation on the division potential of cells in vitro. VIII. Cytogenetic analysis of human fibroblasts.

Human embryonic and adult cells were irradiated with fractionated doses of low dose rate ionizing radiation starting early during their lifespan. Adult cells were found to be more sensitive than fetal cells to ionizing radiation in terms of the number of cells produced during the lifespan of the control and the irradiated cultures. Phase-III adult control cells had fewer chromosomal aberrations than phase-III embryonic control cells. After irradiation there was an increase in chromosomal aberrations in adult cells but no increase in embryonic cells beyond those found in the control cultures. It is suggested that cells that have a higher potential for chromosomal rearrangements survive better after low dose rate ionizing radiation.

Fructose-induced enhanced mitogenicity of diploid human cells: possible relationship with cell differentiation.

Fructose strongly stimulates the growth of normal diploid human skin fibroblasts (SFs) and induces marked changes in their morphology and lipid accumulation. This mitogenic effect occurs despite very low fructose consumption and depends on the presence of glutamine. The cell kinetics of cultured fructose-fed human skin fibroblasts were different from those fed on glucose: in the presence of fructose a high proliferative index persisted at Day 14 of culture and the duration of the total cell cycle and of the G1 + 1/2 M and S phases was slightly shorter. The mitogenic effect of fructose on SF was largest in the presence of human serum: it was small or undetectable when fibroblasts were cultured in media supplemented with dialyzed human serum, fetal bovine serum, or serum substitutes. This suggests that serum growth factor(s) mediate the mitogenic effect of fructose. Only normal diploid human cells seem to be sensitive to this mitogenic effect of fructose: the long-term growth of normal human liver cells on fructose was slightly better or similar to that on glucose. In contrast, fructose could only support limited growth of hamster fibroblastic Nil cells and of a transformed human fibroblastic line, which grew better with glucose.

Impaired hexose uptake by diploid skin fibroblasts from galactosaemic patients. Connection with cell growth and amino acid metabolism, and possible bearing on late-onset clinical symptoms.

In skin fibroblasts of patients presenting with galactosaemia, either from galactose 1-phosphate uridyltransferase or galactokinase deficiency, a deficit in extracellular glucose utilization was observed. This deficit was constant over 3 weeks of continuous cell growth in a medium containing 5.5 mmol/L glucose as the only hexose, and homologous serum. Levels of glucose utilization by deficient skin fibroblasts were stable at about 65-70% of the glucose utilization of control normal skin fibroblasts. Cell morphology was normal, and cell growth was subnormal during this period. However, the energy provision appeared sufficient for cellular needs since cell growth in this glucose medium was observed not to depend on the presence of extracellular glutamine. In contrast, glutamine was required for growth of galactosaemic fibroblasts cultured in medium containing 5.5 mmol/L galactose. If expressed in many cell types, this impaired glucose uptake would be expected seriously to damage highly glucose-dependent tissues such as the central nervous system. This might be of relevance to the persistent neurological damage observed in many galactosaemic patients in spite of their compliance with an early strict galactose-free diet.

Respective effects of glucose and glutamine on the glutamine synthetase activity of human skin fibroblasts.

The activity of Glutamine Synthetase (GS) was measured during the growth of human diploid skin fibroblasts cultured for three weeks in the presence or absence of either glucose or glutamine or both. In medium free of both glucose and glutamine, a single late peak in GS activity was observed concomitantly with delayed small cell protein increment. In all media containing either glucose or glutamine or both. GS activity rose sharply during rapid cell growth, displayed a plateau, and then decreased once the cells had reached confluency. The variations in extracellular amino acid levels were also determined and were found to depend on the composition of the medium but not on the cell culture duration. These results demonstrate, for the first time as far as we know, that strong GS activity is present in rapidly growing skin fibroblasts. In contrast to many other mammalian cell types, GS activity in human skin fibroblasts appears not to be subject to regulation by extracellular glutamine. This difference may well be connected with cell differentiation.

Construction of an integrated physical and gene map of human chromosome 20p12 providing candidate genes for Alagille syndrome.

Physical mapping and localization of eSTS markers were used to generate an integrated physical and gene map covering a approximately 10-Mb region of human chromosome 20p12 containing the Alagille syndrome (AGS) locus. Seventy-four STSs, 28 of which were derived from cDNA sequences, mapped with an average resolution of 135 kb. The 28 eSTS markers define 20 genes. Six known genes, namely CHGB, BMP2, PLCB1, PLCB4, SNAP, and HJ1, were precisely mapped. Among the genes identified, one maps in the smallest region of overlap of the deletions associated with AGS and could therefore be regarded as a candidate gene for Alagille syndrome.

Mutations in JAGGED1 gene are predominantly sporadic in Alagille syndrome.

BACKGROUNDS & AIMS: Mutations in the JAGGED1 gene are responsible for the Alagille syndrome, an autosomal dominant disorder characterized by neonatal jaundice, intrahepatic cholestasis, and developmental disorders affecting the liver, heart, vertebrae, eyes, and face. We screened a large group of patients for mutations in JAGGED1 and studied transmission of the mutations. METHODS: The coding sequence of the JAGGED1 gene was searched by single-strand conformation polymorphism and sequence analysis for mutations in 109 unrelated patients with the Alagille syndrome and their family if available. RESULTS: Sixty-nine patients (63%) had intragenic mutations, including 14 nonsense mutations, 31 frameshifts, 11 splice site mutations, and 13 missense mutations. We identified 59 different types of mutation of which 54 were previously undescribed; 8 were observed more than once. Mutations were de novo in 40 of 57 probands. CONCLUSIONS: Most of the observed mutations other than the missense mutations in JAGGED1 are expected to give rise to truncated and unanchored proteins. All mutations mapped to the extracellular domain of the protein, and there appeared to be regional hot spots, although no clustering was observed. Thus, the sequencing of 7 exons of JAGGED1 would detect 51% of the mutations. Transmission analysis showed a high frequency of sporadic cases (70%).

Periodic fluctuations in proliferation of SV-40 transformed human skin fibroblast lines with prolonged lifespan.

A human fibroblastic cell line transformed by the SV40-T antigen sequence and continuously cultured for 7 months displayed large periodic variations in cell proliferation. This contrasted with other characteristics of this cell line that remained constant: mosaic cell shape, absence of cell contact inhibition, and predominance of a hypodiploid population. Similar fluctuations in proliferative capacity were also found during the long-term growth of a transformed but nonimmortalized human fibroblastic line prior to senescence, and in the established hamster fibroblastic Nil cell line. This growth pattern suggests a recurrent stimulation of growth in these three transformed cell lines. The proliferation pattern from cultured transformed cells may thus be complex and requires further investigation. These variations presumably influence major cell functions. This observation has important implications for the analysis of data from such cell lines.

Qualitative differences in effects of recombinant alpha-, beta- and gamma-interferons on human peripheral blood leukocytes in vitro.

The in vitro effects of bacteria-produced human interferons alpha 2, beta and gamma on several properties of peripheral blood leukocytes from different healthy donors were compared. Treatment with HuIFN-alpha 2 or HuIFN-beta resulted in inhibition of the proliferative response to phytohaemagglutinin and in closely parallel induction of 2'-5'-oligoadenylate synthetase activity. In contrast, HuIFN-gamma had no significant effect on these two activities. However, all three HuIFN were able to enhance natural killer cell cytotoxicity and the expression of HLA-DR surface antigens, with only quantitative variations from donor to donor. Similar results were observed with glycosylated recombinant hamster-cell-derived HuIFN-gamma and with natural HuIFN-gamma. These data demonstrate qualitative differences in the effects of HuIFN-gamma compared to those of HuIFN-alpha 2 or -beta on cells of the immune system.

Construction of a 3.7-Mb physical map within human chromosome 20p12 ordering 18 markers in the Alagille syndrome locus.

Alagille syndrome (AGS, MIM 118450) is associated with human chromosome band 20p12. To study this region, we constructed a 3.7-Mb physical map using 36 YACs isolated from the CEPH YAC library with three sequence-tagged sites (STS): D20S503, D20S41, and D20S188. New STSs were obtained from 6 isolated YAC end-fragments. Eighteen markers were ordered on the contig as follows:20ptel-D20S177-D20S175-D20S509- D20S5/D20S503-D20S506-D20S162-D20S504- D20S505-D20S507-D20S188-(D20S6-D20S27- D20S189)-D20S186-D20S41-D20S61-D20S492- D20S508-20pcen. A restriction map with the enzymes AscI, MluI, NotI, SacII, and SfiI was generated, revealing seven putative CpG islands. We established a YAC contig that spans the AGS region and thus will be valuable for cloning candidate genes and searching for DNA polymorphisms segregating with this syndrome.

Deleted chromosome 20 from a patient with Alagille syndrome isolated in a cell hybrid through leucine transport selection: study of three candidate genes.

Alagille syndrome (AGS) is a well-defined genetic entity assigned to the short arm of Chromosome (Chr) 20 by a series of observations of AGS patients associated with microdeletions in this region. By fusing lymphoblastoid cells of an AGS patient that exhibited a microdeletion in the short arm of Chr 20 encompassing bands p11.23 to p12.3 with rodent thermosensitive mutant cells (CHOtsH1-1) deficient in-leucyl-tRNA synthetase, we isolated a somatic cell hybrid segregating the deleted human Chr 20. This hybrid clone, designated NR2, was characterized by several methods, including PCR, with eight pairs of oligonucleotides mapped to Chr 20: D20S5, D20S41, D20S42, D20S56, D20S57, D20S58, adenosine deaminase (ADA), and Prion protein (PRIP); Restriction Fragment Length Polymorphism (RFLP) analyses with four genomic anonymous probes (D20S5, cD3H12, D20S17, D20S18); and fluorescent in situ hybridization (FISH) with total human DNA and D20Z1, a sequence specific to the human Chr 20 centromere, as probes. The NR2 hybrid allowed us to exclude three candidate genes for AGS: hepatic nuclear factor 3 beta (HNF3 beta), paired box 1 (PAX1), and cystatin C (CST3) as shown by their localization outside of the deletion. The NR2 hybrid is a powerful tool for the mapping of new probes of this region, as well as for obtaining new informative probes specific for the deletion by subtractive cloning of the region. Such markers will be useful for linkage analysis and screening of cDNA libraries.

Extinction of peroxisomal functions in hepatoma cell-fibroblast hybrids.

Although peroxisomes are ubiquitous, differences in the number of organelles and in the expression of associated metabolic activities are observed, depending on the cell type. To investigate the control of peroxisomal activity in connection with cell differentiation, we constructed hybrids between two types of cells whose histogenetic origins dictate significant differences in peroxisomal activities: hepatoma cells and fibroblasts, with high and low expression, respectively, of peroxisomal functions. In these hybrids, extinction of the elevated activities that characterize liver cells is observed, in parallel with the well-documented extinction of differentiated functions. This suggests the existence in fibroblasts of a negative trans-acting regulation.