Cold Atmospheric Plasma Is a Promising Alternative Treatment Option in Case of Split Skin Graft Failure

Cold atmospheric plasma (CAP) has shown promising potential in promoting wound healing. This case report presents the successful application of CAP in a 42-year-old female patient with extensive wound healing disorders and superinfections following the excision of an abscess in the left thoracic region. After several failed split skin graft attempts, the implementation of CAP led to significant improvements in wound healing. This report highlights the wound healing-promoting effects of CAP and discusses its potential mechanisms of action.

Murine Macrophages Modulate Their Inflammatory Profile in Response to Gas Plasma-Inactivated Pancreatic Cancer Cells

Macrophages and immuno-modulation play a dominant role in the pathology of pancreatic cancer. Gas plasma is a technology recently suggested to demonstrate anticancer efficacy. To this end, two murine cell lines were employed to analyze the inflammatory consequences of plasma-treated pancreatic cancer cells (PDA) on macrophages using the kINPen plasma jet. Plasma treatment decreased the metabolic activity, viability, and migratory activity in an ROS- and treatment time-dependent manner in PDA cells in vitro. These results were confirmed in pancreatic tumors grown on chicken embryos in the TUM-CAM model (in ovo). PDA cells promote tumor-supporting M2 macrophage polarization and cluster formation. Plasma treatment of PDA cells abrogated this cluster formation with a mixed M1/M2 phenotype observed in such co-cultured macrophages. Multiplex chemokine and cytokine quantification showed a marked decrease of the neutrophil chemoattractant CXCL1, IL6, and the tumor growth supporting TGFβ and VEGF in plasma-treated compared to untreated co-culture settings. At the same time, macrophage-attractant CCL4 and MCP1 release were profoundly enhanced. These cellular and secretome data suggest that the plasma-inactivated PDA6606 cells modulate the inflammatory profile of murine RAW 264.7 macrophages favorably, which may support plasma cancer therapy.

Risk Assessment of kINPen Plasma Treatment of Four Human Pancreatic Cancer Cell Lines with Respect to Metastasis

Cold physical plasma has limited tumor growth in many preclinical models and is, therefore, suggested as a putative therapeutic option against cancer. Yet, studies investigating the cells' metastatic behavior following plasma treatment are scarce, although being of prime importance to evaluate the safety of this technology. Therefore, we investigated four human pancreatic cancer cell lines for their metastatic behavior in vitro and in chicken embryos (in ovo). Pancreatic cancer was chosen as it is particularly metastatic to the peritoneum and systemically, which is most predictive for outcome. In vitro, treatment with the kINPen plasma jet reduced pancreatic cancer cell activity and viability, along with unchanged or decreased motility. Additionally, the expression of adhesion markers relevant for metastasis was down-regulated, except for increased CD49d. Analysis of 3D tumor spheroid outgrowth showed a lack of plasma-spurred metastatic behavior. Finally, analysis of tumor tissue grown on chicken embryos validated the absence of an increase of metabolically active cells physically or chemically detached with plasma treatment. We conclude that plasma treatment is a safe and promising therapeutic option and that it does not promote metastatic behavior in pancreatic cancer cells in vitro and in ovo.

Cold Physical Plasma-Treated Buffered Saline Solution as Effective Agent Against Pancreatic Cancer Cells

BACKGROUND

Cold physical plasma has been suggested as a new anticancer tool recently. However, direct use of plasma is limited to visible tumors and in some clinical situations, is not feasible. This includes repetitive treatment of peritoneal metastases, which commonly occur in advanced gastrointestinal cancer and in pancreatic cancer in particular. In case of diffuse intraperitoneal metastatic spread, Hyperthermic Intraperitoneal Intraoperative Chemotherapy (HIPEC) is used as a therapeutic approach. Plasma-treated solutions may combine non-toxic characteristics with the anticancer effects of HIPEC. Previous work has provided evidence for an anticancer efficacy of plasma-treated cell culture medium but the clinical relevance of such an approach is low due to its complex formulation and lack of medical accreditation.

OBJECTIVE

Plasma-treated Phosphate-Buffered Saline (PBS), which closely resembles medically certified solutions, was investigated for its cytotoxic effect on 2D monolayer murine pancreatic cancer cells in vitro.

METHODS

Toxicity studies of primary murine fibroblasts, PDA6606 murine pancreatic cancer cells, and COLO 357 human pancreatic cancer cells exposed to plasma-treated PBS were performed.

RESULTS

Plasma-treated PBS significantly decreased cancer cell metabolisms and proliferation whereas plasma-treated Dulbecco's Modified Eagle Medium had no effect. Moreover, tumor cell growth attenuation was significantly higher when compared to syngeneic primary murine fibroblasts. Both results were confirmed in a human pancreatic cancer cell line. Finally, plasma-treated PBS also decreased the size of pancreatic tumors in a three-dimensional manner, and induction of apoptosis was found to be responsible for all anticancer effects identified.

CONCLUSION

Plasma-treated PBS inhibited cell growth in 2D and 3D models of cancer. These results may help facilitate the development of new plasma-derived anticancer agent with clinical relevance in the future.

Cold atmospheric pressure plasma for treatment of chronic wounds: drug or medical device?

OBJECTIVE

The use of cold atmospheric pressure plasma (CAPP) as a new therapeutic option to aid the healing of chronic wounds appears promising. Currently, uncertainty exists regarding their classification as medical device or medical drug. Because the classification of CAPP has medical, legal, and economic consequences as well as implications for the level of preclinical and clinical testing, the correct classification is not an academic exercise, but an ethical need.

METHOD

A multidisciplinary team of physicians, surgeons, pharmacists, physicists and lawyers has analysed the physical and technical characteristics as well as legal conditions of the biological action of CAPP.

RESULTS

It was concluded that the mode of action of the locally generated CAPP, with its main active components being different radicals, is pharmacological and not physical in nature.

CONCLUSION

Depending on the intended use, CAPP should be classified as a drug, which is generated by use of a medical device directly at the point of therapeutic application.

Physical plasma-treated saline promotes an immunogenic phenotype in CT26 colon cancer cells in vitro and in vivo

Metastatic colorectal cancer is the fourth most common cause of cancer death. Current options in palliation such as hyperthermic intraperitoneal chemotherapy (HIPEC) present severe side effects. Recent research efforts suggested the therapeutic use of oxidant-enriched liquid using cold physical plasma. To investigate a clinically accepted treatment regimen, we assessed the antitumor capacity of plasma-treated saline solution. In response to such liquid, CT26 murine colon cancer cells were readily oxidized and showed cell growth with subsequent apoptosis, cell cycle arrest, and upregulation of immunogenic cell death (ICD) markers in vitro. This was accompanied by marked morphological changes with re-arrangement of actin fibers and reduced motility. Induction of an epithelial-to-mesenchymal transition phenotype was not observed. Key results were confirmed in MC38 colon and PDA6606 pancreatic cancer cells. Compared to plasma-treated saline, hydrogen peroxide was inferiorly toxic in 3D tumor spheroids but of similar efficacy in 2D models. In vivo, plasma-treated saline decreased tumor burden in Balb/C mice. This was concomitant with elevated numbers of intratumoral macrophages and increased T cell activation following incubation with CT26 cells ex vivo. Being a potential adjuvant for HIPEC therapy, our results suggest oxidizing saline solutions to inactivate colon cancer cells while potentially stimulating antitumor immune responses.

Cathepsin B-Mediated Activation of Trypsinogen in Endocytosing Macrophages Increases Severity of Pancreatitis in Mice

BACKGROUND & AIMS

Acute pancreatitis is characterized by premature intracellular activation of digestive proteases within pancreatic acini and a consecutive systemic inflammatory response. We investigated how these processes interact during severe pancreatitis in mice.

METHODS

Pancreatitis was induced in C57Bl/6 wild-type (control), cathepsin B (CTSB)-knockout, and cathepsin L-knockout mice by partial pancreatic duct ligation with supramaximal caerulein injection, or by repetitive supramaximal caerulein injections alone. Immune cells that infiltrated the pancreas were characterized by immunofluorescence detection of Ly6g, CD206, and CD68. Macrophages were isolated from bone marrow and incubated with bovine trypsinogen or isolated acinar cells; the macrophages were then transferred into pancreatitis control or cathepsin-knockout mice. Activities of proteases and nuclear factor (NF)-κB were determined using fluorogenic substrates and trypsin activity was blocked by nafamostat. Cytokine levels were measured using a cytometric bead array. We performed immunohistochemical analyses to detect trypsinogen, CD206, and CD68 in human chronic pancreatitis (n = 13) and acute necrotizing pancreatitis (n = 15) specimens.

RESULTS

Macrophages were the predominant immune cell population that migrated into the pancreas during induction of pancreatitis in control mice. CD68-positive macrophages were found to phagocytose acinar cell components, including zymogen-containing vesicles, in pancreata from mice with pancreatitis, as well as human necrotic pancreatic tissues. Trypsinogen became activated in macrophages cultured with purified trypsinogen or co-cultured with pancreatic acini and in pancreata of mice with pancreatitis; trypsinogen activation required macrophage endocytosis and expression and activity of CTSB, and was sensitive to pH. Activation of trypsinogen in macrophages resulted in translocation of NF-kB and production of inflammatory cytokines; mice without trypsinogen activation (CTSB-knockout mice) in macrophages developed less severe pancreatitis compared with control mice. Transfer of macrophage from control mice to CTSB-knockout mice increased the severity of pancreatitis. Inhibition of trypsin activity in macrophages prevented translocation of NF-κB and production of inflammatory cytokines.

CONCLUSIONS

Studying pancreatitis in mice, we found activation of digestive proteases to occur not only in acinar cells but also in macrophages that infiltrate pancreatic tissue. Activation of the proteases in macrophage occurs during endocytosis of zymogen-containing vesicles, and depends on pH and CTSB. This process involves macrophage activation via NF-κB-translocation, and contributes to systemic inflammation and severity of pancreatitis.

[Use of Reusable Textile Undergloves for Medical Procedures: A Feasibility Study]

OBJECTIVE

Undergloves are a way to reduce moisture-related skin damage. The aim of this feasibility study was to gain experience with logistics, applicability, acceptability and cost of the routine use of reusable textile undergloves in a hospital setting.

METHODS

Undergloves were tested with 18 health-care workers on an intensive care unit over three months. Data on usage as well as logistics were recorded. At baseline, personal data and knowledge and use of cotton undergloves, existing skin problems and the nursing behaviour of the hands by the subjects were determined by means of an input questionnaire. After each wearing, data on usage were collected by a questionnaire. Participants were interviewed by means of a questionnaire with respect to their experience with the use of the undergloves.

RESULTS

Acceptance and compliance with the use of undergloves was remarkably good. This was partly due to the properties of the gloves, and partly to the reduction of sweating and very positive effect on the skin of the hands. In the study period 2165 underglove uses were documented, resulting in an average daily consumption of four pairs per person per day. The average wearing time was 28.6 min. The undergloves were suitable for application as well as reprocessing. Reprocessment-related fatigue was relatively low and did not lead to the loss of the properties, only few gloves had to be sorted out. Even if one assumes a complete write-off of the gloves with end of the study, costs for reprocessing were about 0.46 € or 64 % less than the single use.

CONCLUSION

The routine use of textile, reprocessable undergloves is feasible. Major challenges for broad usage are within logistics and acceptance by the user.

[Modern treatment of an appendiceal mass]

BACKGROUND

The recommendations for the treatment of an appendiceal mass are still controversial. The need for staged appendectomy is still under discussion.

PATIENTS AND METHODS

In a retrospective study all patients with the diagnosis appendiceal mass (ICD 10 K35.32) treated in the surgical clinic of the University Clinic in Greifswald between June 1999 and June 2011 were analyzed.

RESULTS

A total of 38 patients were included in the study whereby 17 patients (9 male and 8 female) were treated with drainage and antibiotics (group A) and 21 (14 male and 7 female) were treated by immediate surgery (group B). Nonsurgical therapy with drainage of the abscess was found to be efficient. Immediate surgical treatment was also effective and should be performed when signs of peritonitis exist. Interval appendectomy is not indicated.

Macrophages promote tumour growth and liver metastasis in an orthotopic syngeneic mouse model of colon cancer

PURPOSE

Tumour-associated macrophages have been shown to promote proliferation, angiogenesis and metastasis in several carcinomas. The effect on colon cancer has not yet been clarified. Furthermore, Kupffer cells in the liver might initiate the formation of metastases by directly binding tumour cells.

METHODS

An orthotopic syngeneic mouse model of colon cancer as well as a liver metastases model has been studied, using murine CT-26 colon cancer cells in Balb/c-mice. Macrophages were depleted in both models by clodronate liposomes. Tumour sizes and metastases were determined using 7-Tesla MRI. The macrophage and vascular density in the orthotopic tumours as well as the Kupffer cell density in the livers were evaluated using immunohistochemistry.

RESULTS

Animals in the macrophage-depleted group displayed significantly smaller primary tumours (37 ± 20 mm(3)) compared to the control group (683 ± 389 mm(3), p = 0.0072). None of the mice in the depleted group showed liver or peritoneal metastases, whereas four of six control mice displayed liver and five out of six mice peritoneal metastases. The vascular density was significantly lower in the macrophage-depleted group (p = 0.0043). In the liver metastases model, animals of the Kupffer cell-depleted group (14.3 ± 7.7) showed significantly less liver metastases than mice of the two control groups (PBS liposomes, 118.5 ± 28.2, p = 0.0117; NaCl, 81.7 ± 23.2, p = 0.0266). The number of liver metastases correlated directly with the Kupffer cell density (p = 0.0221).

CONCLUSION

Macrophages promote tumour growth, angiogenesis and metastases in this orthotopic syngeneic mouse model. Kupffer cells enhance the formation of metastases in the liver.

Induction of M2-macrophages by tumour cells and tumour growth promotion by M2-macrophages: a quid pro quo in pancreatic cancer

INTRODUCTION

More effective therapies are required to improve survival of pancreatic cancer. Possible immunologic targets include tumour associated macrophages (TAMs), generally consisting of M1- and M2-macrophages. We have analysed the impact of TAMS on pancreatic cancer in a syngeneic orthotopic murine model.

METHODS

6606PDA murine pancreatic cancer cells were orthotopically injected into C57BL6 mice. Tumour growth was monitored using MRI. Macrophages were depleted by clodronate liposomes. Tumours including microvessel density were evaluated using immunohistochemistry, immunofluorescence and/or cytometric beads assays. Naïve macrophages were generated employing peritoneal macrophages. In vitro experiments included culturing of macrophages in tumour supernatants as well as tumour cells cultured in macrophage supernatants using arginase as well as Griess assays.

RESULTS

Clodronate treatment depleted macrophages by 80% in livers (p = 0.0051) and by 60% in pancreatic tumours (p = 0.0169). MRI revealed tumour growth inhibition from 221.8 mm(3) to 92.3 mm(3) (p = 0.0216). Micro vessel densities were decreased by 44% (p = 0.0315). Yet, MCP-1-, IL-4- and IL-10-levels within pancreatic tumours were unchanged. 6606PDA culture supernatants led to a shift from naïve macrophages towards an M2-phenotype after a 36 h treatment (p < 0.0001), reducing M1-macrophages at the same time (p < 0.037). In vivo, M2-macrophages represented 85% of all TAMs (p < 0.0001). Finally, culture supernatants of M2-macrophages induced tumour growth in vitro by 63.2% (p = 0.0034).

CONCLUSIONS

This quid pro quo of tumour cells and M2-macrophages could serve as a new target for future immunotherapies that interrupt tumour promoting activities of TAMs and change the iNOS-arginase balance towards their tumoricidal capacities.

[Single-port access cholecystectomy is a safe alternative to conventional laparoscopic cholecystectomy: a retrospective comparison of single-port access versus standard laparoscopic cholecystectomy]

PURPOSE

As laparoscopic surgery develops, one current goal is the reduction of scarring and operative trauma to a minimum. Single-port access surgery (SPA) uses a single small incision hidden in the umbilicus. This report describes our experiences with 69 SPA cholecystectomies compared to the conventional laparoscopic approach.

METHODS

Within two years 69 SPA cholecystectomies were performed. Data including demographic distribution, incision to closure time, duration of the postoperative hospital stay, rates of intraoperative and postoperative complications, and conversion rates were collected retrospectively. Data for a matched control group treated by standard laparoscopic cholecystectomy were gathered within the same time frame and then compared.

RESULTS

There were no significant differences in the rates of intraoperative or postoperative complications in the SPA group when compared to the standard laparoscopy group. The incision-to-closure time strongly depended on the surgeon but did not depend on the method. The duration of postoperative hospital stay was slightly decreased in the SPA group. However, this effect was statistically not significant.

CONCLUSIONS

For selected patient groups, SPA cholecystectomy is on par with the conventional laparoscopic method. The cosmetic advantage that it offers does not come at the cost of any loss of safety.

[Disease-adapted closure of the appendicular stump in laparoscopic appendectomy]

The frequency of laparoscopic appendectomy has dramatically increased with it now being the standard procedure for acute appendicitis in many hospitals in Germany. Hence, these hospitals require the personnel, the technique as well as the expertise to guarantee a top standard and quality of appendectomies at all times. Only this will meet the requirements of the high case load and the socio-economical importance of appendectomies. The closure of the appendicular stump is a critical step of this procedure. The three most commonly used techniques consist of the endo-loop, the clip and the endo-stapler. The endo-stapler has the advantage of offering closure and transection of the appendix in one step; it can be employed in all cases of appendicular inflammation; and it allows a partial caecal resection. However, it is quite expensive. The clip and the endo-loop offer the same cost-effectiveness, yet the clip appears to be simpler in use compared to the loop. Also, sharing this feature with the stapler, it offers the possibility of closing and transecting the appendix before dissecting the mesoappendix. A disadvantage of the clip not being shared with the loop is the limitation of clips to appendicular diameters of only up to 16 mm. In summary, we propose a cost-effective disease-adapted closure of the appendicular stump employing the clip in standard appendectomies, with the endo-loop being a good alternative. If clip or loop cannot be applied the stapler is the technique of choice. In particular, it should be used if the base of the appendix is inflamed. Adopting this pathway helps to control the still somewhat higher costs of laparoscopic appendectomies compared to classical open appendectomies.

Determination of antiseptic efficacy of rubs on the forearm and consequences for surgical hand disinfection

While hands are acknowledged to be the most important source of pathogens from the skin of the surgical team, the transmission of pathogens from the forearms may also be relevant. Preoperative hand disinfection is recommended, but evidence-based standards for the forearms are lacking. As neither the European standard EN 12791 nor the American guidelines ASTM 1115 are applicable to the forearms, a new test method based on the European standard EN 12791 and the German Society for Hygiene and Microbiology (DGHM) method for testing for the efficacy of skin antiseptics was developed to address the forearms. The antiseptic efficacy of a commercially available alcohol-based hand rub [76.7% (w/w) ethanol] was assessed on the upper arm after 15s, 2.5 min, and 30 min, and on the lower arm after 2.5 min, 30 min, and 3 h. On the upper arm, application of the product followed the DGHM standard procedure. On the forearm, the product was applied by the participants themselves with the right hand over the left forearm and vice versa as performed during preoperative hand disinfection. Sampling and culture were performed according to the DGHM method for skin antisepsis on the upper arm. Twenty-two volunteers were investigated. The efficacy of the antiseptic treatment on the forearm was not significantly lower than on the upper arm for any of the areas tested (P > 0.05). Reduction factors for all tested areas and times were quite similar, with confidence intervals ranging between 1.43 and 2.31 log₁₀. We suggest that an application time of 10s may be sufficient for the treatment of the forearm as part of preoperative hand disinfection, provided that an appropriate product is used.

A syngeneic orthotopic murine model of pancreatic adenocarcinoma in the C57/BL6 mouse using the Panc02 and 6606PDA cell lines

BACKGROUND/AIMS

To develop a clinically relevant immunocompetent murine model to study pancreatic cancer using two different syngeneic pancreatic cancer cell lines and to assess MRI for its applicability in this model.

METHODS

Two cell lines, 6606PDA and Panc02, were employed for the experiments. Cell proliferation and migration were monitored in vitro. Matrigel™ was tested for its role in tumor induction. Tumor cell growth was assessed after orthotopic injection of tumor cells into the pancreatic head of C57/BL6 mice by MRI and histology.

RESULTS

Proliferation and migration of Panc02 were significantly faster than those of 6606PDA. Matrigel did not affect tumor growth/migration but prevented tumor cell spread after injection thus avoiding undesired peritoneal tumor growth. MRI could reliably monitor longitudinal tumor growth in both cell lines: Panc02 had a more irregular finger-like growth, and 6606PDA grew more spherically. Both tumors showed local invasiveness. Histologically, Panc02 showed a sarcoma-like undifferentiated growth pattern, whereas 6606PDA displayed a moderately differentiated glandular tumor growth. Panc02 mice had a significantly shorter (28 days) survival than 6606PDA mice (50 days).

CONCLUSION

This model closely mimics human pancreatic cancer. MRI was invaluable for longitudinal monitoring of tumor growth thus reducing the number of mice required. Employing two different cell lines, this model can be used for various treatment and imaging studies.

Concentration of bacteria passing through puncture holes in surgical gloves

BACKGROUND

The reasons for gloving-up for surgery are to protect the surgical field from microorganisms on the surgeon's hands and protect the surgeon from the patient's microorganisms. This study measured the concentration of bacteria passing through glove punctures under surgical conditions.

METHODS

Double-layered surgical gloves were worn during visceral surgeries over a 4-month period. The study included 128 outer gloves and 122 inner gloves from 20 septic laparotomies. To measure bacterial passage though punctures, intraoperative swabs were made, yielding microorganisms that were compared with microorganisms retrieved from the inner glove layer using a modified Gaschen bag method.

RESULTS

Depending on the duration of glove wear, the microperforation rate of the outer layer averaged 15%. Approximately 82% of the perforations went unnoticed by the surgical team. Some 86% of perforations occurred in the nondominant hand, with the index finger being the most frequently punctured location (36%). Bacterial passage from the surgical site through punctures was detected in 4.7% of the investigated gloves.

CONCLUSION

Depending on the duration of wear, surgical gloves develop microperforations not immediately recognized by staff. During surgery, such perforations allow passage of bacteria from the surgical site through the punctures. Possible strategies for preventing passage of bacteria include strengthening of glove areas prone to punctures and strict glove changing every 90 minutes.

[Atypical vascular supply from the coeliac trunk. Recurrent bleeding from a duodenal ulcer]

Hemorrhagic duodenal ulcers should primarily be controlled by endoscopy. In cases of recurrent bleeding or if bleeding cannot be controlled endoscopically, open surgery is the gold standard. Rarely, atypical origin of arteries or additional atypical arteries may lead to further unexpected hemorrhagic recurrences and angiography with surgical intervention is the treatment of choice. In this article a rare case of an atypical visceral artery connecting the coeliac trunk and the gastroduodenal artery leading to recurrent bleeding from a duodenal ulcer is presented.

Acute upper gastrointestinal hemorrhage: is a radiological interventional approach an alternative to emergency surgery?

The aim of our study was to discuss the option of endovascular treatment compared to surgery for patients with endoscopically unmanageable nonvariceal hemorrhage of the upper gastrointestinal tract. From 2000 to 2006, 23 patients (male, 15 male; female, 8; mean age, 69 years) who failed endoscopic therapy for upper gastrointestinal hemorrhage were retrospectively evaluated. Twelve patients were operated on (SG), whereas 11 patients had an endovascular intervention (IG). Technical and primary clinical success rates and complications rates were calculated. Clinical parameters and comorbidities were related to outcome. The surgical group suffered less frequently from pre-existing pulmonary diseases (SG, 17%; IG, 55%; p = 0.05) and had a higher incidence of shock requiring catecholamines (p < 0.01) or plasma expander therapy (p < 0.01). There was no significant difference in the incidence of recurrent bleeding episodes (SG, 17%; IG, 27%; p = 0.35) and mortality rates (SG, 17%; IG, 27%, p = 0.35). Deaths in the IG were due to recurrent bleeding. In patients with unsuccessful endoscopic control of nonvariceal bleeding of the upper GI tract, surgery remains a very effective treatment. However, in patients with a high surgical risk due to unknown bleeding sources and/or severe pre-existing diseases/comorbidities, endovascular therapy offers an excellent treatment option. These patients should then be operated on as early as possible to minimize the risk of recurrent bleeding episodes, which are associated with high morbidity and mortality.