"Higher" by Tems is a song about being brave in the face of adversity and rising above any challenges life throws at you. The song encourages the listener to take a step back and look for the good in the world, even though it may not always be easy. The chorus emphasizes this message by repeating the phrase "higher" and speaking of going "beyond the noise and your feelings." It is a song of hope, reminding the listener that they can get through anything, they just need to stay focused, keep pushing, and strive for something higher.

Results:  TEMs were significantly higher in tumour foci, peripheral blood and ascites in EOC patients. The proportion of TEMs among total tissue macrophages was positively correlated with tumour MVD. In vivo animal results showed that TEMs promoted EOC angiogenesis and metastasis. Further functional and mechanisms studies revealed that concentration of angiopoietin 2 (Ang2), a ligand of Tie2, was elevated in EOC ascites which further recruit TEMs in a dose-dependent manner as a powerful chemokine to TEMs. Recruited TEMs promoted endothelial cell function through IGF1-activated downstream signalling. Blocking secreted IGF1 using inhibiting antibody reduced TEMs mediated angiogenesis and metastasis.


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Conclusions:  TEMs significantly increased in EOC patients and were recruited to tumour loci by the increased Ang2. The increased TEMs have diagnostic value in ovarian cancer and were positively correlated with the MVD in ovarian cancer tissue. Furthermore, TEMs promote angiogenesis via IGF1 in both in vivo and in vitro experimental systems after stimulation by Ang2. Altogether, this study paves the way to develop novel therapy targets as the axis of Ang2-TEMs-IGF1 in EOC.

However, the maximum field of view (FOV) that SEMs can achieve is far larger than TEMs, meaning TEM users can only image a very small part of their sample. Similarly, the depth of field of SEM systems is much higher than in TEM systems.



In addition, the way images are created are different in the two systems. In SEMs, samples are positioned at the bottom of the electron column, and the scattered electrons (back-scattered or secondary) are captured by electron detectors. Photomultipliers are then used to convert this signal into a voltage signal, which is amplified to create the image on a PC screen.

When working in STEM mode, the users can take advantage of the capabilities of both techniques. They can look at the inner structure of samples with very high resolving power (even higher than TEM resolution), but also use other signals like X-rays and electron energy loss. These signals can be used in spectroscopic techniques: energy-dispersive X-ray spectroscopy (EDX) and electron energy loss spectroscopy (EELS).

Of course, EDX is also a common practice in SEM systems and is used to identify the chemical composition of samples by detecting the characteristic X-rays that are emitted from the materials when they are bombarded with electrons.

Desktop SEM systems require minimal sample preparation and their relaxed vacuum requirements and small evacuated volume allow the system to present an image much more quickly than a typical floor model system.

To discover more about SEM and see if it fits your research requirements, you can take a look at our free e-guide: How to choose a Scanning Electron Microscope. This E-guide is intended to assist you in choosing the most suitable Scanning Electron Microscope (SEM) systems for your research.

TEMs significantly increased in EOC patients and were recruited to tumour loci by the increased Ang2. The increased TEMs have diagnostic value in ovarian cancer and were positively correlated with the MVD in ovarian cancer tissue. Furthermore, TEMs promote angiogenesis via IGF1 in both in vivo and in vitro experimental systems after stimulation by Ang2. Altogether, this study paves the way to develop novel therapy targets as the axis of Ang2-TEMs-IGF1 in EOC.

Peripheral blood mononuclear cells (PBMCs) and cells in ascites isolated from patient cohorts were double-stained with FITC-conjugated anti-CD14 (555397, BD Biosciences, Franklin, NJ, USA) and APC-conjugated anti-Tie2 (FAB3131A, R&D Systems) antibodies. Tie2+CD14+ TEMs were detected by flow cytometry. Numbers of TEMs were quantified by gating on CD14+ cells. FITC/APC-conjugated isotype antibodies were used control antibodies.

Serum and ascites were collected from patient cohorts. The Ang2 and IGF1 levels were detected by ELISA using human Angiopoietin2 (DANG20, R&D Systems) or human IGF1 Quantikine ELISA kit (DG100, R&D Systems).

Ovarian tissue slides from 124 EOC patients and 75 patients with benign ovarian cysts were evaluated by immunofluorescence for the presence of total tissue macrophages and TEMs (Figure 1A). The number of total tissue macrophages identified as CD68+ cells is significantly higher (P

To determine if infiltrated TEMs correlate with tumour angiogenesis, we measured MVD using anti-CD31 staining in ovarian tissue slides obtained from 124 ovarian cancer patients and 75 patients with benign cysts (Figure 8A). As expected, MVD in ovarian cancer patients (6.055.08) was significantly higher (Figure 8B, P

CCR2, the receptor for the chemokine MCP1 that plays an important role in the recruitment of monocytes, was not expressed in TEMs (Augustin et al, 2009), suggesting that TEMs might be attracted to tissues by other factors. Ang2, as a ligand for Tie2, is upregulated in malignant tumours as a response to hypoxia and functions as a chemoattractant for human TEMs (Huang et al, 2011). Interestingly, Ang2 levels were increased in the ascites fluid of EOC patients and were significantly higher than matched sets of serum. Increased Ang2 levels in EOC patients, especially in the ascites samples, may play an important role in recruiting TEMs to tissue. Pretreatment of cells with anti-Tie2 antibody reversed TEMs attraction by Ang2. These results suggest that TEMs migration into tumour tissue may be regulated by increased Ang2 levels in the tumour microenvironment and expression of Tie2 on TEMs. Similar results were observed in TEK-U937 cell line, supporting the hypothesis that the over-expressed Tie2 in monocytic cell lines interact with the ligand Ang2. These results also suggest that TEK-U937 may be used as a Tie2 expressing monocytic cell model in future studies.

In summary, we found that TEMs are significantly increased in peripheral blood, ascites, and tissue samples of ovarian cancer patients. And the increased TEMs have diagnostic value in ovarian cancer. Our study also showed that Ang2 was increased in ovarian cancer ascites, and could attract TEMs to tumour tissue. Furthermore, MVD in ovarian cancer tissue correlated with TEMs number and frequency. We also found that the TEMs promote angiogenesis via IGF1 in both in vivo and in vitro experimental systems after stimulation by Ang2. Thus, the Ang2-TEMs-IGF1 axis is a potential target for ovarian cancer therapy.

The TS contains a cellular compartment that includes cancer cells, fibroblasts, myofibroblasts, vascular and immune cells (12). TS cells support tumor development by preserving proliferative signaling, preventing growth suppressors, arresting apoptosis, inducing angiogenesis, stimulating invasion and minimizing immune destruction (14,15). Among TS cells, there are tumor-associated macrophages (TAMs) that are able to secrete many soluble factors including cytokines and growth factors necessary for tumor tropism. In particular, a subclass of TAMs named M2 (activated M2 type macrophages) (16) can secrete the pro-angiogenic factors vascular endothelial growth factor (VEGF) or endothelial growth factor (EGF), thus promoting tumor angiogenesis. The fact that HCC is a highly vascularized tumor indicates the role of this cell type in HCC development and the potential role as diagnostic marker. Notably, the levels of VEGF and other pro-angiogenic soluble factors such as angiopoietin-2 (ANG-2), are higher in HCC patients compared to non-HCC subjects and correlate with patients survival (17-19). However, such molecules did not show any significant advantage compared to other clinically available markers for HCC diagnosis (20). These findings prompted the researchers to explore the possibility that the targets of the angiogenic factors rather than the factors per se, could have been more informative for HCC diagnosis and monitoring. In this regard, particular interest has been put on the tyrosine kinase with Ig and EGF homology domains 2 (TIE2), a receptor of angiopoietins, predominantly present on endothelial cells but recently also observed on monocytes [TIE-2-expressing monocytes (TEMs)] (20-22). Notably, TEMs presence has been observed in human kidney, colon and pancreas cancers, where angiogenesis plays an important role in tumor progression (20).

No information was available with regard to the significance of TEMs in HCC until the work of Matsubara et al. (23). In their work, the authors studied the frequency of TEMs in the peripheral blood of 168-HCV infected patients with 89 of them bearing HCC. The major finding of this work was that the amount of circulating TEMs is higher in HCV/HCC patients compared to HCV patients or healthy subjects. As TEMs levels were not related to tumor stage, TEMs elevation can be considered a stage-independent diagnostic marker for HCC.

Matsubara et al. also suggest that TEMs elevation is HCC and not HCV related. This consideration stems from the observation that TEMs increase was higher in non HCV-infected HCC patients compared to non-HCC patients. However, this aspect has to be further investigated in the future as, for example, it has been reported that TEMs are significantly more elevated in HCV-infected patients without HCC compared to healthy subjects (24). Despite this aspect, in the cohort studied by Matsubara et al., the specificity of TEMs levels turned out to be superior to the commonly used AFP and the circulating levels of ANG-2. e24fc04721

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