Exosomal miRNA confers chemo resistance via targeting Cav1/p-gp/M2-type macrophage axis in ovarian cancer.

BACKGROUND: Circulating miRNAs are known to play important roles in intercellular communication. However, the effects of exosomal miRNAs on cells are not fully understood. METHODS: To investigate the role of exosomal miR-1246 in ovarian cancer (OC) microenvironment, we performed RPPA as well as many other in vitro functional assays in ovarian cancer cells (sensitive; HeyA8, Skov3ip1, A2780 and chemoresistant; HeyA8-MDR, Skov3-TR, A2780-CP20). Therapeutic effect of miR-1246 inhibitor treatment was tested in OC animal model. We showed the effect of OC exosomal miR-1246 uptake on macrophages by co-culture experiments. FINDINGS: Substantial expression of oncogenic miR-1246 OC exosomes was found. We showed that Cav1 gene, which is the direct target of miR-1246, is involved in the process of exosomal transfer. A significantly worse overall prognosis were found for OC patients with high miR-1246 and low Cav1 expression based on TCGA data. miR-1246 expression were significantly higher in paclitaxel-resistant OC exosomes than in their sensitive counterparts. Overexpression of Cav1 and anti-miR-1246 treatment significantly sensitized OC cells to paclitaxel. We showed that Cav1 and multi drug resistance (MDR) gene is involved in the process of exosomal transfer. Our proteomic approach also revealed that miR-1246 inhibits Cav1 and acts through PDGFß receptor at the recipient cells to inhibit cell proliferation. miR-1246 inhibitor treatment in combination with chemotherapy led to reduced tumor burden in vivo. Finally, we demonstrated that when OC cells are co-cultured with macrophages, they are capable of transferring their oncogenic miR-1246 to M2-type macrophages, but not M0-type macrophages. INTERPRETATION: Our results suggest that cancer exosomes may contribute to oncogenesis by manipulating neighboring infiltrating immune cells. This study provide a new mechanistic therapeutic approach to overcome chemoresistance and tumor progression through exosomal miR-1246 in OC patients.

Cutaneous Ciliated Cyst in an Unusual Location: Between Two Scapulas.

Cutaneous ciliated cyst is defined as a rare, painless lesion frequently encountered on the lower extremities of young girls after puberty. The cyst is surrounded by the columnar ciliary epithelium. Apart from the lower extremities of girls, they may be localized on the scalp, scapula, thumb, abdomen, umbilicus, thigh, heel, knee, and gluteal region. There are two theories to explain this localization. The first is that they are mullerian heterotrophy, while the other is that they are ciliated metaplasia of eccrine glands. In this paper, we described a cutaneous ciliated cyst, which was observed with a previously undescribed localization on the back of a 13-year-old female patient.

A Case of Tuberculous Meningitis with Paradoxical Response in a 14-Year-Old Boy.

A clinical or radiological worsening of already existing lesions or an emergence of new lesions after beginning treatment in patients with tuberculosis (TB) is referred to as the paradoxical response. This has aroused suspicion regarding the accuracy of diagnosis, the possibilities of treatment failure, or the presence of another underlying disease, and thus it is an important topic for clinicians to understand. In this article, the development of a paradox reaction in a 14-year-old male patient diagnosed with and treated for tuberculosis meningitis is reported. This pediatric patient with a healthy immune system is treated with steroids successfully and reported to elucidate the importance of managing the paradox of TB progression in spite of the appropriate anti-TB medications.

The ZNF304-integrin axis protects against anoikis in cancer.

Ovarian cancer (OC) is a highly metastatic disease, but no effective strategies to target this process are currently available. Here, an integrative computational analysis of the Cancer Genome Atlas OC data set and experimental validation identifies a zinc finger transcription factor ZNF304 associated with OC metastasis. High tumoral ZNF304 expression is associated with poor overall survival in OC patients. Through reverse phase protein array analysis, we demonstrate that ZNF304 promotes multiple proto-oncogenic pathways important for cell survival, migration and invasion. ZNF304 transcriptionally regulates ß1 integrin, which subsequently regulates Src/focal adhesion kinase and paxillin and prevents anoikis. In vivo delivery of ZNF304 siRNA by a dual assembly nanoparticle leads to sustained gene silencing for 14 days, increased anoikis and reduced tumour growth in orthotopic mouse models of OC. Taken together, ZNF304 is a transcriptional regulator of ß1 integrin, promotes cancer cell survival and protects against anoikis in OC.

Which sequence best protects the heart against trastuzumab and anthracycline toxicity? An electron microscopy study in rats.

BACKGROUND/AIM: Two effective cytotoxic agents, doxorubicin and trastuzumab, are associated with potentially life-threatening cardiotoxicity. The present study was designed to investigate cardiotoxicity aggravated by the timing of administration of trastuzumab and doxorubicin in rats. MATERIALS AND METHODS: Twenty-four rats were randomly assigned to one of four groups. These received one of the following treatment drug regimens administered via intraperitoneal injection: (i) 0.9% saline control (n=6); (ii) doxorubicin (5 mg/kg) on day 1 then trastuzumab 10 mg/kg on day 15 (n=6); (iii) trastuzumab 10 mg/ kg on day 1 then doxorubicin (5 mg/kg) on day 15 (n=6) or (iv) doxorubicin (5 mg/kg) on day 1 and trastuzumab 10 mg/ kg on day 1 (n=6). On the 30th day, the hearts were processed for pathological analysis by electron microscopy. RESULTS: Electron microscopy revealed an ultrastructurally normal heart tissue in the control group. At electron microscopic examination of the tissue samples in the second and fourth group, a mild degree of dilation was observed in the peri-nuclear cisternae of some heart muscle cells. In the third group, pathological changes were detected in mitochondria. These exhibited prominent cristae, which also showed a mild degree of ultrastructural pathology in mitochondria. CONCLUSION: Based on electron microscopy findings, sequential administration of anthracycline first, followed by trastuzumab is safer in terms of cardiotoxicity, while the most toxic schedule for the rat heart was trastuzumab first, followed by anthracycline.

Liver fibrosis may reduce the efficacy of budesonide in the treatment of autoimmune hepatitis and overlap syndrome.

BACKGROUND AND AIM: The aim of the present study was to assess the efficacy and tolerability of budesonide as an alternative first line treatment option for autoimmune hepatitis (AIH) and the overlap syndrome. METHODS: A total of 18 AIH or overlap syndrome patients were evaluated. Outcomes of treatment by the end of the study were defined as treatment failure, partial response, complete response and remission. RESULTS: Complete response and remission were achieved in 61.1% (11/18) of patients, while 38.9% (7/18) of patients were considered treatment failures. Liver fibrosis was observed in 55.5% of patients' biopsies. More patients with liver fibrosis failed to respond to treatment compared to patients without fibrosis, a difference bordering on statistical significance (60% vs. 12.5%; p=0.066). Although statistically insignificant, the presence of at least one side effect was observed more frequently in patients with fibrosis compared to those without fibrosis (80% vs. 37.5%; p=0.145). Overall, side effects occurred significantly more commonly in non-responders than responders (100% vs. 36%; p=0.013). CONCLUSIONS: Budesonide is an effective treatment option for the management of AIH, with a low incidence of side effects in patients without findings of advanced liver disease. The presence of liver fibrosis may increase the likelihood of treatment failure as well as the risk of developing side effects. Our study findings suggest that budesonide may be effective in a select group of AIH patients. Further studies are needed to determine its exact place for the treatment of AIH and overlap syndrome.