Absence of Wip1 partially rescues Atm deficiency phenotypes in mice

Wild-type p53-induced phosphatase 1 (WIP1) is a serine/threonine phosphatase that dephosphorylates proteins in the ataxia telangiectasia mutated (ATM)-initiated DNA damage response pathway. WIP1 may have a homeostatic role in ATM signaling by returning the cell to a normal pre-stress state following completion of DNA repair. To better understand the effects of WIP1 on ATM signaling, we crossed Atm-deficient mice to Wip1-deficient mice and characterized phenotypes of the double knockout progeny. We hypothesized that the absence of Wip1 might rescue Atm deficiency phenotypes. Atm null mice, like ATM-deficient humans with the inherited syndrome ataxia telangiectasia, exhibit radiation sensitivity, fertility defects, and are T-cell lymphoma prone. Most double knockout mice were largely protected from lymphoma development and had a greatly extended lifespan compared with Atm null mice. Double knockout mice had increased p53 and H2AX phosphorylation and p21 expression compared with their Atm null counterparts, indicating enhanced p53 and DNA damage responses. Additionally, double knockout splenocytes displayed reduced chromosomal instability compared with Atm null mice. Finally, doubly null mice were partially rescued from gametogenesis defects observed in Atm null mice. These results indicate that inhibition of WIP1 may represent a useful strategy for cancer treatment in general and A-T patients in particular.

Average daily dose, medication adherence, and healthcare costs among commercially-insured patients with fibromyalgia treated with duloxetine

OBJECTIVE

What is the relationship between average daily dose (ADD) of duloxetine, adherence to therapy, and healthcare costs among patients with fibromyalgia?

METHODS

Employing a retrospective cohort design, this study assessed administrative claims data for commercially-insured fibromyalgia patients who initiated duloxetine in 2006. Initiation was defined as a 90-day clean period without access to duloxetine. Five study cohorts were constructed based on the ADD of duloxetine, calculated from all prescriptions dispensed over the 12-month follow-up period: <30 mg, 30 mg, 31-59 mg, 60 mg, and >60 mg (duloxetine starting dose: 30 mg/day; target dose: 60 mg/day). Medication possession ration (MPR) was used to assess duloxetine adherence, with MPR ≥0.8 as 'high' adherence. Multivariate regressions were applied to examine the association between ADD, duloxetine adherence, and healthcare costs (total, inpatient, outpatient, and pharmacy), adjusting for differences in demographic and clinical characteristics between cohorts.

RESULTS

Of the 4869 patients with fibromyalgia, 3% had an ADD of <30 mg, 12% had 30 mg, 21% had 31-59 mg, 46% had 60 mg, and 18% had >60 mg. High adherence to duloxetine ranged from 16% to 41% across cohorts. Controlling for demographic and clinical characteristics, patients with an ADD of 31-59 mg or >60 mg were more likely to adhere to duloxetine therapy than those in the 60 mg cohort, while patients in the <30 mg cohort were less likely to adhere to duloxetine (all p < 0.05). Total costs were significantly higher for individuals in the 31-59 mg or >60 mg ADD cohorts ($1834 and $5766) than those maintaining an ADD of 60 mg, as were outpatient ($1167 and $2275) and pharmacy costs ($502 and $2983) (all p < 0.05). Patients with an ADD of 30 mg had significantly lower total (-$1770), inpatient (-$1524), and pharmacy (-$827) costs (all p < 0.05) than those with an ADD of 60 mg.

LIMITATIONS

This study is subject to selection bias because some confounders might be unobserved in the administrative claims database. Indirect costs or over-the-counter medication costs were also not available.

CONCLUSIONS

Fibromyalgia patients with an ADD of 60 mg of duloxetine had better adherence than patients with an ADD ≤30 mg. Duloxetine patients with an ADD of 30 mg (31-59 or >60 mg) had significantly lower (higher) healthcare costs than those maintaining an ADD of 60 mg.

A British Society of Paediatric Gastroenterology, Hepatology and Nutrition survey of the effectiveness and safety of adalimumab in children with inflammatory bowel disease

BACKGROUND

Adalimumab is efficacious therapy for adults with Crohn's disease (CD).

AIM

To summarise the United Kingdom and Republic of Ireland paediatric adalimumab experience.

METHODS

British Society of Paediatric Gastroenterology, Hepatology and Nutrition (BSPGHAN) members with Inflammatory Bowel Disease (IBD) patients <18 years old commencing adalimumab with at least 4 weeks follow-up. Patient demographics and details of treatment were then collected. Response and remission was assessed using the Paediatric Crohn's Disease Activity Index (PCDAI)/Physicians Global Assessment (PGA).

RESULTS

Seventy-two patients [70 CD, 1 ulcerative colitis (UC), 1 IBD unclassified (IBDU)] from 19 paediatric-centres received adalimumab at a median age of 14.8 (IQR 3.1, range 6.1-17.8) years; 66/70 CD (94%) had previously received infliximab. A dose of 80 mg then 40 mg was used for induction in 41(59%) and 40 mg fortnightly for maintenance in 61 (90%). Remission rates were 24%, 58% and 41% at 1, 6 and 12 months, respectively. Overall 43 (61%) went into remission at some point, with 24 (35%) requiring escalation of therapy. Remission rates were higher in those on concomitant immunosuppression cf. those not on immunosuppression [34/46 (74%) vs. 9/24 (37%), respectively, (χ(2) 8.8, P=0.003)]. There were 15 adverse events (21%) including four (6%) serious adverse events with two sepsis related deaths in patients who were also on immunosuppression and home parenteral nutrition (3% mortality rate).

CONCLUSIONS

Adalimumab is useful in treatment of refractory paediatric patients with a remission rate of 61%. This treatment benefit should be balanced against side effects, including in this study a 3% mortality rate.

Packing technique for endovascular coil embolisation of peripheral arterial pseudo-aneurysms with preservation of the parent artery: safety, efficacy and outcomes

OBJECTIVES

To evaluate the endovascular treatment of pseudo-aneurysms (PAs) with super-selective coil embolisation using the 3D packing technique.

DESIGN

Retrospective study of consecutive patients in one academic centre.

MATERIALS

From 2002 to 2009, 16 patients (mean age 51.6 years, range 24-82) underwent PA sac packing with coils. Four patients were asymptomatic, nine had PA rupture, and three had other symptoms. Lesion location was as follows: splenic artery (8), carotid artery (2), hepatic artery (2), superior mesenteric artery (1), cystic artery (1), uterine artery (1), and hypogastric artery (1).

METHODS

The sac was packed with 0.018-inch controlled-detachable microcoils, preserving the parent artery. Magnetic resonance angiography was done within 6 months, at 12 months then yearly.

RESULTS

Technical success rate was 100%. Complete definitive PA exclusion was achieved with a single procedure in 15 (93.8%) patients. One patient with a secondary bleeding arterio-digestive fistula underwent successful surgery. No major complications or late recanalisations occurred during follow-up (mean, 24.7 months; range 6-49).

CONCLUSIONS

Coil PA embolisation by 3D sac packing is safe and effective and may induce less morbidity than complete parent vessel occlusion, stent placement, or open surgery. This procedure should be used whenever possible, as it preserves parent artery patency.

Soft tissue management of children's open tibial fractures--a review of seventy children over twenty years

INTRODUCTION

The management of open tibial fractures in children represents a unique reconstructive challenge. The aim of the study was to evaluate the management of paediatric open tibial fractures with particular regard to soft tissue management.

PATIENTS AND METHODS

A retrospective case-note analysis was performed for all children presenting with an open tibial fracture at a single institution over a 20-year period for 1985 to 2005.

RESULTS

Seventy children were reviewed of whom 41 were males and 29 females. Overall, 91% (n = 64) of children suffered their injury as a result of a vehicle-related injury. The severity of the fracture with respect to the Gustilo classification was: Grade I, 42% (n = 29); Grade II, 24% (n = 17); Grade III, 34% (n = 24; 7 Grade 3a, 16 Grade 3b, 1 Grade 3c). The majority of children were treated with external fixation and conservative measures, with a mean hospital in-patient stay of 13.3 days. Soft tissue cover was provided by plastic surgeons in 31% of all cases. Four cases of superficial wound infection occurred (6%), one case of osteomyelitis and one case of flap failure. The limb salvage was greater than 98%.

CONCLUSIONS

In this series, complications were associated with delayed involvement of plastic surgeons. Retrospective analysis has shown a decreased incidence of open tibial fractures which is reported in similar studies. Gustilo grade was found to correlate with length of hospital admission and plastic surgery intervention. We advocate, when feasible, the use of local fasciocutaneous flaps (such as distally based fasciocutaneous and adipofascial flaps), which showed a low complication rate in children.

A rare entity of an unusual site: adenomatoid tumour of the adrenal gland: a case report and review of the literature

This is a case report of a 51 year old male who was found to have an incidental left sided non-functioning adrenal mass on routine medical examination and which was confirmed by CT and MRI scans. A laparoscopic left adrenalectomy was done. On gross examination the tumour was a solitary well circumscribed solid-cystic mass with a homogenous pinkish white cut surface. On microscopic examination, the tumour was composed of variably sized tubules and fenestrated channels lined by bland cuboidal cells to epithelioid cells. There was focal extension to capsule and peri-adrenal fat. Immunohistochemically the tumour cells stained with calretinin, Cam5.2, CK7, vimentin and focally with EMA. Ki-67 fraction was <1%. They were negative for ER, CD31, CD34, Factor 8, chromogranin, synaptophysin S100 and inhibin. A diagnosis of an adenomatoid tumour as made. Adenomatoid tumours are rare benign tumours of mesothelial derivation. The adrenal gland is devoid of a mesothelial lining and the most accepted hypothesis for an adenomatoid tumour originating in the adrenal gland is derivation from mesothelial rests. As the adrenal gland is an extremely rare site of occurrence for an adenomatoid tumour, it is frequently mistaken for adrenocortical tumours or a pheochromocytoma clinically and radiologically.

MicroRNA-206 expression levels correlate with clinical behaviour of rhabdomyosarcomas

Background:

Rhabdomyosarcomas (RMSs) are primarily paediatric sarcomas that resemble developing skeletal muscle. Our aim was to determine the effects of microRNAs (miRNA) that have been implicated in muscle development on the clinical behaviour of RMSs.

Methods:

Expression levels of miR-1, miR-206, miR-133a and miR-133b were quantified by RT–PCR in 163 primary paediatric RMSs, plus control tissues, and correlated with clinico-pathological features. Correlations with parallel gene expression profiling data for 84 samples were used to identify pathways associated with miR-206. Synthetic miR-206 was transfected into RMS cell lines and phenotypic responses assessed.

Results:

Muscle-specific miRNAs levels were lower in RMSs compared with skeletal muscle but generally higher than in other normal tissues. Low miR-206 expression correlated with poor overall survival and was an independent predictor of shorter survival in metastatic embryonal and alveolar cases without PAX3/7-FOXO1 fusion genes. Low miR-206 expression also significantly correlated with high SIOP stage and the presence of metastases at diagnosis. High miR-206 expression strongly correlated with genes linked to muscle differentiation and low expression was associated with genes linked to MAPkinase and NFKappaB pathway activation. Increasing miR-206 expression in cell lines inhibited cell growth and migration and induced apoptosis that was associated with myogenic differentiation in some, but not all, cell lines.

Conclusion:

miR-206 contributes to the clinical behaviour of RMSs and the pleiotropic effects of miR-206 supports therapeutic potential.

Primary aortoenteric fistula caused by an infected abdominal aortic aneurysm with Mycobacterium avium complex in an HIV patient

Primary aortoenteric fistula (PAEF) is a rare but complex clinical entity requiring multimodality approach for diagnosis and treatment. We report the first ever case of upper gastrointestinal (UGI) hemorrhage caused by an aortoenteric fistula (AEF) secondary to Mycobacterium avium complex (MAC) in a patient with human immunodeficiency virus (HIV) infection. Esophagogastroduodenoscopy (EGD) showed an ulcer in the distal duodenum and a computed tomography (CT) scan confirmed a contained abdominal aortic aneurysm (AAA) rupture with an aorto-enteric fistula communicating with the third portion of the duodenum. Emergent surgery was undertaken which was lifesaving. A high index of suspicion, early diagnosis and prompt surgical intervention are crucial for survival of patient with PAEF.

Targeting Aldose Reductase: A Novel Strategy in Treating Endocrine Resistance Using Combination Therapy

Breast cancer is the most commonly diagnosed form of cancer in women. Among breast cancer patients about 2/3 are initially hormone sensitive or estrogen receptor (ER) positive and respond to endocrine therapy. Aromatase inhibitors (AI's) are superior class of hormonal therapeutic agents effectively control ER positive breast cancer in postmenopausal women. Acquired resistance to AI's is expected to be an emerging serious problem in clinics and recent studies have shown that tumors use adaptive signaling mechanisms to overcome AI sensitivity. Thus there is an urgent need for newer treatment modalities. Combination of endocrine and non endocrine agents that block these signaling pathways may prevent or delay the adaptive mechanism and thereby onset of resistance to hormonal therapy. In our study we have found that Fidarestat, an aldose reductase (enzyme which catalyzes the rate limiting step of glucose to fructose or sorbitol formation in polyol pathway) inhibitor effectively re-sensitize letrozole resistant LTLT-Ca breast cancer cells to letrozole. 1µM of fidarestat + 1uM letrozole was found very effective in inducing maximum cell death in LTLT-Ca cells when compared to fidarestat alone. The combination treatment not only restored ER-α levels but also down regulated HER2/MAPK signaling proteins. Aldose reductase siRNA (100nM)- treated MCF-7/Aro and MCF-7 cells upregulated ER-α in western blot and ER-functionality assays. On the other hand in aldose reductase-siRNA- treated LTLT-Ca cells, ER-α levels were down- regulated as in fidarestat treatment. Pretreatment of LTLT-Ca with fidarestat for one week showed reduced proliferation of cells and the effect was maintained until four passages with 1µM letrozole alone. Fidarestat treatment up-regulated E2-mediated transcription in LTLT-Ca cells. In order to enhance the efficacy and targeted delivery of fidarestat in LTLT–Ca cells we have used a nanoparticle-based therapeutic formulation. Folate receptor, highly expressed on epithelial carcinomas, could be a potential molecular target for tumor selective drug delivery. Physcio-chemically well characterized Fidarestat–folate nanoparticles (FFNP's) were prepared to increase the tumor selective intracellular delivery. FFNP's were found superior in exerting cytotoxicity when compared to fidarestat alone. Combination therapy was equally effective in controlling LTLT-Ca cell growth using xenograft model. Taken together, the increased glucose metabolism in LTLT-Ca cells may be critically contributing to chemotherapeutic resistance by increasing drug metabolism and decreasing uptake. Hence targeting aldose reductase in endocrine resistance may be attractive alternative to increase the sensitivity of hormonal therapy.

Citation Information: Cancer Res 2009;69(24 Suppl):Abstract nr 67.

Blunt abdominal trauma in children: how predictive is ALT for liver injury?

BACKGROUND

The liver is the second most commonly injured intra-abdominal organ in children. CT scanning is currently regarded as the "gold standard" in screening for intra-abdominal injury following blunt trauma. However, the risks associated with performing CT in children are not insignificant and, in addition, CT is not always readily available. This study investigates the utility of alanine aminotransferase (ALT) in screening for liver injury in paediatric trauma.

METHODS

Two groups of patients were compiled from a prospectively identified trauma registry-one with liver injuries and another with intra-abdominal injuries other than to the liver. Inclusion in the study required that an initial ALT level had been obtained after injury. Where CT had been performed, a paediatric radiologist blind to the ALT results graded the severity of the liver injuries. The study groups were compared and a receiver operating characteristic (ROC) curve generated to derive the optimum ALT threshold to identify liver injury.

RESULTS

51 patients with liver injury and 65 with other intra-abdominal injuries were identified. An ALT level of > or =104 IU/l gave a sensitivity of 96% and a specificity of 80%. When liver injuries were stratified to identify only clinically significant liver injuries (grades III, IV and V), this ALT threshold identified 100% of patients with 70% specificity.

CONCLUSIONS

In this sample, ALT appears to be a useful predictor for the presence or absence of liver injury. In haemodynamically stable children with clinical suspicion of isolated liver injury, identification of a normal ALT level (<104 IU/l) may reduce the need for unnecessary transportation for CT scanning with subsequent radiation exposure.

Occupational health and safety status of indigenous and Latino farmworkers in Oregon

Exposure to pesticides poses great risk to agricultural workers and their families. Of the approximately 174,000 agricultural workers in Oregon, studies estimate that up to 40% of the workers in Oregon are indigenous and may be particularly vulnerable to the health risks of working in pesticide treated areas. Surveys conducted with Oregon farmworkers suggest that Latino and indigenous farmworkers differ demographically and may have diverse occupational and health needs. All Latino workers reported Spanish as their native language, while indigenous workers spoke several different native languages. Latino workers were employed mostly in orchards (28%) and nurseries (24%), while indigenous workers were mostly pickers (40%). Indigenous farmworkers reported less frequent suitable occupational safety training, and potentially less knowledge of the health consequences of pesticides. Addressing the barriers to obtaining pesticide health and safety information is of primary importance, given the changing demographics of farmworkers in Oregon. This article concludes with a discussion of these findings and the programmatic activities that have been implemented in Oregon to improve farmworkers' understanding of hazards and rights associated with agricultural work.