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X Martin

Publications and source records attributed to X Martin.

At least 37 records · Page 2Linked to original sources
PubMed2001

HSP70-mediated acceleration of translational recovery after stress is independent of ribosomal RNA synthesis.

HSP70 is known to protect cells against stressful events. In the present study, the hypothesis was investigated that elevated HSP70 levels protect RNA polymerase I during stress, leading to decreased inhibition of ribosomal RNA (rRNA) synthesis and accelerated recovery of protein translation after stress. To this end, transcriptional and translational activity was studied in H9c2 cells during recovery after a severe heat treatment (SHT, 1 h 45 degrees C) in the presence of elevated HSP70 levels. The latter was achieved by heat pretreatment or by adenovirus-mediated hsp70 gene transfer. Rates of transcription and translation were determined by measuring cellular 3H-labelled uridine and leucine incorporation, respectively. The two types of pretreatment did not affect basal rates of transcription and translation, immediately before SHT. During SHT, both transcriptional and translational rates dropped to less than 10% of basal levels in pretreated as well as non-pretreated cells. Two and four h after SHT, both transcriptional and translational rates were significantly higher in HSP70-overexpressing cells compared to non-pretreated cells. However, immediately after SHT, transcription rates were similarly depressed in non-pretreated and pretreated cells, showing that increased levels of HSP70 did not protect RNA polymerase I activity during SHT. Thus, the HSP70-mediated acceleration of translational recovery is not preceded in time by an enhanced recovery of rRNA synthesis. Therefore, the HSP70-mediated early recovery of protein synthesis after heat stress is independent of rRNA synthesis.

Adenoviridae↗
PubMed2001

A primate model of renal ischemia-reperfusion injury for preclinical evaluation of the antileukocyte function associated antigen 1 monoclonal antibody odulimonab.

PURPOSE: We established a primate model to investigate the effects of the antileukocyte function associated antigen 1 (CD 11a) mAb odulimomab (Imtix-Sangstad, Lyon, France) for preventing renal ischemia-reperfusion injury. MATERIALS AND METHODS: We randomly divided 34 Macaca cynomolgus monkeys into groups 1 and 2, which received a renal autograft after 2 hours of cold ischemia, and groups 3 and 4, which received the autograft after 24 hours of cold ischemia. Before cold ischemia all harvested kidneys were subjected to 30 to 45 minutes of warm ischemia. Groups 1 and 3 monkeys were treated with an antileukocyte function associated antigen 1 mAb before cold ischemia and then for 3 days, while groups 2 and 4 monkeys received an IgG1 isotype control. In all groups renal function was investigated before warm ischemia and 72 hours after reperfusion. Serum creatinine and the leukocyte count were determined daily. Histological studies were done and lactoferrin was measured in the autotransplanted kidney 72 hours after reperfusion. RESULTS: A decrease in renal function was shown after 2 hours of cold ischemia with tubular necrosis and mild cell infiltration, while after 24 hours of cold ischemia there was severe renal failure with tubular and glomerular necrosis, and leukocyte infiltration. A significant improvement in renal function and decrease in kidney lactoferrin content was evident in group 1 compared to group 2 at 72 hours, while no significant difference was noted in groups 3 and 4. No difference in histological patterns was evident in treated and untreated animals. CONCLUSIONS: This study provides evidence for the validity of this ischemia-reperfusion injury model in primates. The protective effects of antileukocyte function associated antigen 1 mAb on renal injury was not as dramatic as in rodent models but a significant improvement in renal function was observed in treated animals after 2 hours of cold ischemia.

Animals↗
PubMed2001

Radiologic evaluations affecting surgical technique in ureteropelvic junction obstruction.

Ureteropelvic junction obstructions can be explored by radiographic methods including ultrasonography, intravenous pyelography, radionuclide scanning, magnetic resonance imaging and computerized tomography. The decision to operate on an ureteropelvic stricture is best given by the results of a radionuclide scan, which can demonstrate the obstruction. The operative technique is influenced by the presence of a polar artery, as this presence represents a danger when endopyelotomy is performed. The presence of a polar artery may be demonstrated by computerized tomography using helicoidal reconstruction. Magnetic resonance imaging with injection of gadolinium is also useful when available. The outcome and the results of the surgical procedure are also evaluated by radionuclide scanning.

Humans↗
PubMed2001

[Emphysematous pyelonephritis: report of 3 cases].

Emphysematous pyelonephritis (EPN) is a rare form of renal suppuration defined by the presence of pus and gas or bacterial origin within the renal parenchyma. It is associated with a high mortality in the absence of rapid and effective treatment. Emergency nephrectomy constitutes the reference treatment. Percutaneous drainage associated with medical treatment is an alternative in patients with localized or bilateral lesions or in the case of solitary kidney. The authors report 3 cases of EPN treated by percutaneous drainage combined with medical treatment for a localized lesion in two cases and nephrectomy in one case of disseminated multilocular lesion with an uneventful course in all three cases.

Emphysema↗
PubMed2001

[Treatment of uretero-intestinal and uretero-vesical stenoses with the Acucise balloon catheter].

OBJECTIVE: Acucise balloon catheter has been proposed as an alternative to open surgery for the treatment of strictures of the ureteropelvic junction because of its low morbidity and the short hospital stay following the endoscopic procedure. The objective of this study was to evaluate the results of this technique applied to patients developing strictures after surgical reimplantation of the ureterovesical (UV) or uretero-intestinal (UI) junction. MATERIAL AND METHODS: Between March 1997 and January 2000, 12 strictures (11 patients) were treated by Acucise balloon catheter via an antegrade and/or retrograde approach with double J stenting for an average of 6 weeks (range: 4 to 12 weeks): 6 uretero-ileal strictures (3 Bricker, 1 uretero-ileoplasty, 1 enterocystoplasty and 1 Kock pouch) and 6 ureterovesical strictures (Lich-Grégoir or Faquin UV reimplantations after gynaecological, vascular or endoscopic surgery). The median postoperative follow-up was 16 months (range: 10 months-36 months). A good result was defined by the absence of recurrence of the stricture evaluated both clinically and radiologically (regression of stasis measured by IVU and/or ultrasonography). RESULTS: The mean operating time was 70 min and the mean hospital stay was 4.8 days (range: 3 and 14 days). Only one intraoperative complication was observed (migration of the double J stent to the kidney). The operation was successful in 8 patients (75%). The success rate was 83% for ureterovesical strictures and 50% for uretero-ileal strictures. A history of previous irradiation appeared to be a factor of failure. CONCLUSION: The Acucise procedure is a minimally invasive and effective (75% success rate) treatment option for the treatment of postoperative stricture after ureteric reimplantations. In our department, this option is considered to be first-line treatment, as surgical reimplantation is reserved for failures of the endoscopic technique.

Adult↗
PubMed2001

[Three cases of spontaneous intraperitoneal rupture of the bladder].

Spontaneous rupture of the bladder is a rare disease which raises real diagnostic and therapeutic problems. Based on three new cases of spontaneous rupture of the bladder in the absence of any trauma and a review of the literature, the authors discuss the various diagnostic, prognostic and therapeutic aspects of this unusual lesion, secondary to multiple aetiologies, predominantly inflammatory causes. Idiopathic rupture of the bladder is particularly serious compared to other forms of traumatic or iatrogenic rupture. Late diagnosis caused by the absence of pathognomonic signs and the generally insidious clinical course at least partly contribute to this severity. Neoplastic forms have a very poor prognosis.

Adult↗
PubMed2000

Laparoscopic vaginal radical trachelectomy: a treatment to preserve the fertility of cervical carcinoma patients.

BACKGROUND: Cervical carcinoma occurs frequently in young women who would like to preserve their childbearing potential. For those with early stage invasive lesions, the authors designed and performed radical trachelectomy, a surgical procedure that preserves the functions of the uterus. METHODS: Radical trachelectomy combines laparoscopic (for pelvic lymphadenectomy) and transvaginal approaches. Between April 1987 and December 1996, 56 patients were scheduled for this procedure, and 47 underwent it. The charts of these patients were retrospectively reviewed for medical and obstetric history, characteristics and complications of surgical procedures, pathologic findings, postoperative obstetric results, and cancer recurrences. RESULTS: The mean durations of the laparoscopic and vaginal steps of the procedure were 62 and 67 minutes, respectively. One intraoperative complication (cystotomy) and seven postoperative complications (drainage of pelvic collection) were observed. The pathologic tumor classification was International Union Against Cancer (UICC) pT1a1 (International Federation of Gynecology and Obstetrics [FIGO] Stage pIA1) in 5 cases, UICC pT1a2 (FIGO Stage pIA2) in 13 cases, UICC pT1b (FIGO Stage pIB) in 25 cases, UICC pT2a (FIGO Stage pIA2) in 1 case, and UICC pT2b (FIGO pIIB) in 3 cases. The mean follow-up was 52 months. Two recurrences (4%) were observed (one lateropelvic and one distant), and one patient died of disease progression. Despite a 25% rate of late miscarriages, 13 normal children were born after radical trachelectomy. CONCLUSIONS: In young patients affected by early invasive cervical carcinoma, radical trachelectomy does not appear to increase the rate of recurrence. It carries a relative risk of infertility and late miscarriage but makes it possible for some patients to become pregnant and give birth to normal newborns. Thus, it seems reasonable to offer this procedure in selected cases, provided that each patient is fully informed and the surgeon properly trained.

Abortion, Spontaneous↗
PubMed2000

Cytomegalovirus infection may cause ureteral necrosis.

Cytomegalovirus (CMV) infection has protean presentation among immunocompromised patients, but the urinary tract is rarely involved. We report a case of extensive ureteral necrosis in a renal transplant, 12-year-old patient with typical histological feature of CMV inclusions. The role of CMV was confirmed by immunohistochemical analysis and concomitant CMV DNA detection in peripheral blood leukocytes by polymerase chain reaction analysis. CMV infection can, therefore, be regarded as a possible cause of ureteral necrosis in renal transplant recipients.

Child↗
PubMed2000

Serological markers of recurrent beta cell destruction in diabetic patients undergoing pancreatic transplantation.

BACKGROUND: Besides alloimmunity to transplanted pancreatic tissue, recurrent autoimmune beta cell destruction is an additional limitation to successful clinical pancreatic allografts in type 1 diabetic patients. METHODS: We studied the prevalence of autoantibodies to glutamate decarboxylase (GAD) 65 and tyrosine phosphatase (IA-2) in 68 C-peptide-negative diabetic patients receiving pancreatic allografts. Sera from patients were obtained immediately before grafting. A second blood sample was analyzed at the time of graft failure in patients who returned to hyperglycemia and during the same follow-up period in those who experienced a functional pancreatic allograft. Patients were classified according to clinical outcome into chronic graft failure (group A, n=20), acute graft failure and/or arterial thrombosis (n=7), or functional pancreatic graft (group C, n=41). Sera from patients were screened for the presence of specific autoantibodies using an islet cell autoantibody assay, a combi-GAD and IA-2 test, and individual GAD and IA-2 assays. RESULTS: Patients from group A had significantly higher combi-test values than patients from group C (13+/-16 vs. 4.5+/-12 units, P<0.02) and higher anti-GAD65 antibody (Ab) levels (0.19+/-0.3 vs. 0.04+/-0.13 units, P<0.01) immediately before grafting. After graft failure in group A, both anti-GAD65 and anti-IA-2 Ab levels increased from baseline, but only the increase in anti-IA-2 Ab levels reached statistical significance (0.28+/-0.12 vs. 15+/-34, P=0.03). When compared with group C, patients from group A had higher anti-GAD65 Abs (0.29+/-0.35 vs. 0.05+/-0.16, P<0.001) after graft failure. Interestingly, the number of double-Ab-positive patients rose from 5% to 35% in group A, whereas it remained at 5% in group C. In pancreatic transplants with bladder drainage, the presence of anti-GAD65 and/or anti-IA2 Abs was not associated with a reduction in urinary amylase levels. This suggests that a loss of endocrine function was not associated with exocrine failure in patients from group A. CONCLUSIONS: We can conclude from the present study that peripheral autoimmune markers are useful in diabetic patients receiving pancreatic allografts.

Adult↗
PubMed2000

Laparoscopic assessment of the sentinel lymph node in early stage cervical cancer.

OBJECTIVE: The aim of this study was to describe a minimally invasive technique enabling us to identify the sentinel lymph node in patients affected by early stage cervical cancer and to report the preliminary data. METHOD: Patent Blue Violet was injected around the tumor. Laparoscopy was undertaken and the blue-dyed lymph nodes (BDLN) were sought. The evidenced BDLN were removed, and then the systematic dissection was carried out. Material. Thirty-five patients were submitted to surgery. A systematic dissection was performed on 69 pelvic sidewalls (no dissection was performed on the second side of the patient for whom we decided to renounce surgery after assessment of the first side). RESULTS: One or more BDLN was evidenced in 59 of 69 dissections. The rate of failure depends on the quantity of injected blue dye. Failure to identify a BDLN depended on the quantity of injected blue dye: 3 of 6 (50%) for 1.5 ml or less, 3 of 18 (17%) for 2 ml, and only 4 of 45 (10%) after injection of 4 ml (P = 0.05). Among the 63 BDLN (in 4 cases 2 BDLN were identified), 53 were located in contact with the external iliac vein, lateral to the inferior vesical artery, and ventral to the origin of the uterine artery, 7 were located close to the origin of one of the collaterals of the internal iliac artery, and 3 were adjacent to the left common iliac vein. One or more positive pelvic lymph nodes was found in 11 pelvic wall dissections done on 8 patients. The BDLN was the positive node or one of them in all cases. CONCLUSION: If the sensitivity of the assessment of the BDLN is confirmed to be 100%, this laparoscopic approach could transform the management of early cervical cancer.

Adenocarcinoma↗
PubMed2000

Effects of portal versus systemic venous drainage in kidney-pancreas recipients.

A randomized study of combined kidney-pancreas transplantation was performed on 30 insulin-dependent diabetic patients with end-stage renal disease to compare the consequences of pancreas transplantation with portal venous (PV) and systemic venous (SV) drainage. Fourteen patients (SV) group) received systemically drained and sixteen (PV group) portally drained pancreas allografts. Enteric drainage was performed in both groups. The routine follow-up included documentation of the clinical course and detailed endocrine studies. At 1 year after transplantation, the patient survival rate was 92% for the SV group and 96% for the PV group; the graft survival rate was 78% and 82%, respectively. Endocrine studies indicated no difference in fasting and stimulated glucose or in glycosylated hemoglobin between the two groups. In addition, no hyperinsulinemia and lipidic abnormalities were evidenced in either group Long-term studies are required to conclude whether PV and SV drainage in pancreas transplantation are equivalent in terms of patient and graft survival as well as metabolic consequences.

Adult↗