Association of endothelial to mesenchymal transition and cellular senescence with fibrosis in skin biopsies of systemic sclerosis patients: a cross-sectional study

OBJECTIVES

Fibrosis is the dominant hallmark of systemic sclerosis (SSc). Several mechanisms have been proposed to drive the disease process, but how these relate to skin fibrosis is poorly understood.

METHODS

We performed a cross-sectional study on archival skin biopsies from 18 SSc patients and four controls. Dermal fibrosis and inflammatory cell infiltration were scored in HE and Masson's Trichrome-stained sections. The presence of senescence was defined by P21 and/or P16 positivity in Ki-67 negative cells. Endothelial to mesenchymal transition (EndMT) was identified by co-localisation of CD31 and α-SMA in immunofluorescent double-stained sections, and by an enclosure of ERG positive endothelial cell nuclei by α-SMA stained cytoplasm in immunohistochemical double staining.

RESULTS

The histological dermal fibrosis score of SSc skin biopsies was correlated with the modified Rodnan skin score (rho 0.55, p=0.042). Staining for markers of cellular senescence on fibroblasts was correlated with fibrosis score, inflammatory score, and CCN2 staining on fibroblasts. Moreover, EndMT was more abundant in skin from patients with SSc (p<0.01) but did not differ between groups with different fibrosis severity. The frequency of these EndMT features increased with the abundance of senescence markers and CCN2 on fibroblasts and dermal inflammation.

CONCLUSIONS

EndMT and fibroblast senescence were more abundant in skin biopsies from SSc patients. This finding indicates that both senescence and EndMT are involved in the pathway leading to skin fibrosis and might be valuable biomarkers and/or possible targets for novel therapeutic interventions.

Microbubble-Assisted Ultrasound for Drug Delivery to the Retina in an Ex Vivo Eye Model

Drug delivery to the retina is one of the major challenges in ophthalmology due to the biological barriers that protect it from harmful substances in the body. Despite the advancement in ocular therapeutics, there are many unmet needs for the treatment of retinal diseases. Ultrasound combined with microbubbles (USMB) was proposed as a minimally invasive method for improving delivery of drugs in the retina from the blood circulation. This study aimed to investigate the applicability of USMB for the delivery of model drugs (molecular weight varying from 600 Da to 20 kDa) in the retina of ex vivo porcine eyes. A clinical ultrasound system, in combination with microbubbles approved for clinical ultrasound imaging, was used for the treatment. Intracellular accumulation of model drugs was observed in the cells lining blood vessels in the retina and choroid of eyes treated with USMB but not in eyes that received ultrasound only. Specifically, 25.6 ± 2.9% of cells had intracellular uptake at mechanical index (MI) 0.2 and 34.5 ± 6.0% at MI 0.4. Histological examination of retinal and choroid tissues revealed that at these USMB conditions, no irreversible alterations were induced at the USMB conditions used. These results indicate that USMB can be used as a minimally invasive targeted means to induce intracellular accumulation of drugs for the treatment of retinal diseases.

Social Identification with the Medical Profession in the Transition from Student to Practitioner

Phenomenon: This study explores professional identity formation during a final year of medical school designed to ease the transition from student to practitioner. Although still part of the undergraduate curriculum, this "transitional year" gives trainees more clinical responsibilities than in earlier rotations. Trainees are no longer regarded as regular clerks but work in a unique position as "semi-physicians," performing similar tasks as a junior resident during extended rotations. Approach: We analyzed transcripts from interviews with 21 transitional-year medical trainees at University Medical Center Utrecht about workplace experiences that affect the development of professional identity. We used Social Identity Approach as a lens for analysis. This is a theoretical approach from social psychology that explores how group memberships constitute an important component of individual self-concepts in a process called 'social identification.' The transcripts were analyzed using thematic analysis, with a focus on how three dimensions of social identification with the professional group emerge in the context of a transitional year: cognitive centrality (the prominence of the group for self-definition), in-group affect (positivity of feelings associated with group membership) and in-group ties (perception of fit and ties with group members). Findings: Students were very aware of being a practitioner versus a student in the position of semi-physician and performing tasks successfully (i.e., cognitive centrality). Students experienced more continuity in patient care in transitional-year rotations than in previous clerkships and felt increased clinical responsibility. As a semi-physician they felt they could make a significant contribution to patient care. Students experienced a sense of pride and purpose when being more central to their patients' care (i.e., in-group affect). Finally, in extended rotations, the trainees became integrated into daily social routines with colleagues, and they had close contact with their supervisors who could confirm their fit with the group, giving them a sense of belonging (i.e., in-group ties). Insights: Using the three-dimension model of social identification revealed how students come to identify with the social group of practitioners in the context of a transitional year with extended rotations, increased clinical responsibilities, and being in the position of a "semi-physician." These findings shed light on the identity transition from student to practitioner within such a curricular structure.

Training medical students for the twenty-first century: Rationale and development of the Utrecht curriculum "CRU+"

AIM

The aim of this report, written for the 40th anniversary issue of Medical Teacher, is to document 20 years of development of the Utrecht undergraduate medical curriculum, as both to exhibit accountability and to inform the community of the process and choices that can be made in long-term curriculum development.

METHODS

We used the SPICES model, created by Medical Teacher's Editor Ronald Harden and colleagues in 1984.

RESULTS

The Utrecht six-year program, now called "CRU+", has many distinct features that were introduced, most of which are well documented. A limited selection includes  • A new 3+3 years Bachelor-Master structure following the EU Bologna rules leading to MD registration for cohorts of about 300.  • Horizontally integrated classroom teaching of basic sciences with clinical disciplines predominantly in groups of 12 and limited lectures.  • Mandatory knowledge retention tests, retesting the clinically relevant core knowledge from block tests of semesters one through four.  • Vertical integration not only linking clinical experience with background knowledge, but also exemplified by a stepwise increase in health care responsibilities throughout the curriculum.  • A final year focussing on growth towards the level of a primary responsible physician in a 12-week sub-internship for a limited number of patients and beds, in a chosen specialty. The student is called a semi-physician in the clerkship of this transitional year to residency.  • Teaching skills training for all medical graduates, an elective teaching rotation and various peer-teaching arrangements throughout the curriculum.  • Integrated semi-longitudinal clerkships with an assessment focus on entrustment decisions for Entrustable Professional Activities.

CONCLUSION

UMC Utrecht has made a continuous attempt to both develop its medical curriculum and to study and report on its development in the literature, regarding new methods found and insights derived. UMC Utrecht will remain committed to developing training to meet twenty-first century demands of medical graduates.

The EPA-based Utrecht undergraduate clinical curriculum: Development and implementation

AIM

As reports of the application of entrustable professional activities (EPAs) increase, not only for postgraduate but also for undergraduate medical education, there is a need for descriptions of what a UME curriculum with EPAs could look like. We provide such a description based on the experiences at University Medical Center Utrecht, the Netherlands, which can be used as an example by other curriculum developers.

METHODS

In a three-year process, the UMC Utrecht Curriculum Committee developed a clinical workplace curriculum with an EPA structure, taking into account examples, such as the US Core EPAs for Entering Residency, and recommendations to integrate and increase the length of clerkships.

RESULTS

In the resulting curriculum, operational from 2016, students train to be trusted with indirect supervision before graduation in five broad EPAs: the clinical consultation; general medical procedures; informing, advising and guiding patients and families; communicating and collaborating with colleagues; and extraordinary patient care. Each of these integrates smaller (nested) EPAs that receive focused training attention in integrated clerkships at various moments and must be signed off for entrustment with indirect supervision to complete the clerkship.

DISCUSSION

The framework of EPAs went through many iterations before it was consolidated. Among the issues that required special attention was the application of a supervision levels scale for sign-off, the necessity to cover all relevant clinical content while not labeling too many small tasks each as a separate EPA, methods of EPA-focused assessment in the workplace and the creation of an e-portfolio model to serve assessment and entrustment.

Medical students' preparation for the transition to postgraduate training through final year elective rotations

Objectives: This study adds to the ongoing discussion on how to ease the transition from undergraduate medical training to postgraduate training. In the Netherlands there is no central matching system for admission to residency. Medical school graduates just apply for a position in an open job market. Many choose to acquire general or specialty-specific clinical experiences after the medical degree before residency, to further explore career opportunities and to increase their chances to get into their preferred specialty. To shorten this gap between undergraduate and the start of postgraduate training, the sixth and final year of most Dutch medical schools is designed as a "transitional year". Students work with more clinical responsibilities than in the earlier clerkships, and this year includes many elective options. Our study focuses on these elective options and explores how medical students use these transitional year electives to prepare for transition to postgraduate training. Methods: In 2012-2013 we asked all 274 graduating students at one Dutch medical school to complete an open-answer questionnaire with the following topics: their preferred specialty at the start of the transitional year, electives they chose during this year and reasons for these choices, and whether the transitional year electives changed their career considerations. Questionnaire results were coded by two researchers and were discussed with all members of the research team. Results: A total of 235 students responded (86%). Answers about motivation for choices revealed that most electives where chosen for career orientation and to optimize chances to get into a residency program. Students also focused on additional experiences in specialties related to their preferred specialty. Many students chose electives logically related to each other, e.g. combinations of surgery and radiology. About two-thirds of the respondents stated that their elective experiences did confirm their specialty preferences or resulted in a more clear insight. Conclusion: We conclude that students use the transitional year electives to focus on their future postgraduate training program, i.e. for orientation and to align their curriculum vitae with their preferred specialty, resulting in spontaneous early specialty streaming. To take advantages of this streaming, and to make sure students can transfer their experiences to other specialties if their career preferences change, individual elective Entrustable Professional Activities (EPAs), next to the core EPAs for all medical students, may serve to prepare a smooth transition to a specialty of choice and should be fully documented.

Risk of Non-melanoma Skin Cancer in Patients with Atopic Dermatitis Treated with Oral Immunosuppressive Drugs

There is uncertainty about the risk of developing non-melanoma skin cancer (NMSC), including basal cell carcinoma and squamous cell carcinoma (SCC), in patients with atopic dermatitis (AD) treated with oral immunosuppressive drugs. A total of 557 patients with AD treated with these drugs in the University Medical Center Utrecht and Groningen, the Netherlands, were analysed. NMSC after oral immunosuppressive treatment was reported in 18 patients (3.2%). The standardized incidence ratio for developing SCC was 13.1 (95% confidence interval (95% CI) 6.5-19.7). Patients developing NMSC were older at the start of therapy (p<0.001) and data lock (p<0.001) compared with patients without NMSC. No significant differences were found in sex, cumulative days of oral immunosuppressive drugs and follow-up between these groups (p=0.42, p=0.88, and p=0.34, respectively). In interpreting these results it is important to include other factors, such as lack of association between treatment duration and tumour development and the long interval between treatment discontinuation and tumour development in some patients.

The immunological phenotype of rituximab-sensitive chronic graft-versus-host disease: a phase II study

Chronic graft-versus-host disease is the major long-term complication after allogeneic stem cell transplantation with a suboptimal response rate to current treatments. Therefore, clinical efficacy and changes in lymphocyte subsets before and after rituximab treatment were evaluated in a prospective phase II study in patients with steroid-refractory chronic graft-versus-host disease. Overall response rate was 61%. Only responding patients were found to have increased B-cell numbers prior to treatment. B cells had a naïve-antigen-presenting phenotype and were mainly CD5 negative or had a low CD5 expression. Normal B-cell homeostasis was reestablished in responding patients one year after ritxumab treatment and associated with a significant decline in skin-infiltrating CD8(+) T cells, suggesting that host B cells play a role in maintaining pathological CD8(+) T-cell responses. Imbalances in B-cell homeostasis could be used to identify patients a priori with a higher chance of response to rituximab treatment (Eudra-CT 2008-004125-42).