Therapeutic antibody engineering for efficient targeted degradation of membrane proteins in lysosomes.

Targeted degradation of pathological proteins is a promising approach to enhance the effectiveness of therapeutic monoclonal antibodies (mAbs) in cancer therapy. In this study, we demonstrate that this objective can be efficiently achieved by the grafting of mannose 6-phosphate analogues called AMFAs2 onto the therapeutic antibodies trastuzumab and cetuximab, both directed against membrane antigens. The grafting of AMFAs confers to these antibodies the novel property of being internalized via the mannose 6-phosphate receptor (M6PR) pathway. AMFA conjugation to these mAbs significantly increases their cellular uptake and leads to enhanced degradation of the target antigens in cancer cells. This results in a drastic inhibition of cancer cell proliferation compared to unconjugated mAbs, as demonstrated in various cancer cell lines, and an increased therapeutic efficacy in mouse and zebrafish xenografted models. These findings highlight the potential of this technology to improve therapeutic outcomes in cancer treatment.

Exploring patient perspectives on electronic patient-reported outcome measures in home-based cancer palliative care: A qualitative study.

Background: Electronic patient-reported outcomes (ePROMs) enhance symptom management and patients' engagement in palliative cancer care. However, integrating them into this setting brings challenges, including patients' familiarity with technological devices and declining health status. Prioritizing the patient's acceptability and feasibility is crucial for their adoption. However, more knowledge is needed about patients' perspectives on the adoption of ePROMs in the community, especially for home-based palliative care. Aim: Explore patient viewpoints on utilizing ePROMs for symptom reporting in home-based oncology palliative care. Design: A qualitative interpretative approach was used to evaluate patients' points of view on using ePROMs in this specific care setting. Semistructured interviews were carried out. Data were analyzed using a reflexive thematic analysis. Setting/participants: A total of 25 patients receiving oncological home palliative care from the advanced palliative care unit of the Fondazione IRCCS Istituto Nazionale dei Tumori in Milan, Italy, were invited to participate. Twenty interviews were conducted, as five patients declined due to deteriorating health. Results: Four themes were identified: (1) strategic value of ePROMs and subjective appreciation; (2) enhancing patient centeredness through ePROMs; (3) exploring and addressing concerns about the use of ePROMs and (4) intersecting factors influencing the efficacy of ePROMs. Conclusion: Despite initial reticence, home palliative care patients consider ePROMs as potentially valuable allies monitoring symptoms, enhancing their quality of life, and amplifying their voices on less explored aspects of care. Continuous dialog between healthcare professionals and patients is crucial for addressing patient skepticism about ePROMs and their impact on the human aspect of care.

Implementation of the e-IPOS in Home Palliative Cancer Care: A Quasiexperimental Pilot Study.

INTRODUCTION: Electronic patient-reported outcome measures (e-PROMs) offer advantages in palliative cancer care, including rapid completion, improved data quality and direct storage, improving clinical decision-making. The electronic Integrated Palliative Care Outcome Scale (e-IPOS) in this context enables thorough self-assessment by patients, enhancing symptom management and self-reflection of their current situation. AIM: To evaluate the feasibility of implementing the e-IPOS in home palliative cancer care. OUTCOMES: The primary outcomes included the enrollment consent rate, study retention rate, e-IPOS completion rate and response completeness, and the number of clinical assessments and interventions performed during home visits. The secondary outcomes were the number of unscheduled visits and patients' perceived quality of life. DESIGN: A two-group quasiexperimental clinical pilot study. The control group received standard palliative care, the intervention group received standard care along with weekly e-IPOS completion during home visits. Both groups were enrolled for 4 weeks. SETTING/PARTICIPANTS: Adults with advanced cancer from the home palliative care unit of the Istituto Nazionale dei Tumori of Milan. RESULTS: Twenty-three patients were enrolled (74.19%), and 20 completed the study (drop-out: 13.04%). 82.5% of the expected e-IPOS responses were received, of which 96.9% were fully complete. In the intervention group, the Wilcoxon test showed an increase in identified needs and documented interventions (P < .05) and a decrease in unscheduled visits (P < .05). CONCLUSION: It is feasible to recruit people via home palliative care for an e-IPOS implementation study. Future fully powered studies should investigate the feasibility and assess patients' perceptions of its use to better understand its clinical benefits.

Engineered therapeutic antibodies with mannose 6-phosphate analogues as a tool to degrade extracellular proteins.

Inducing the degradation of pathological soluble antigens could be the key to greatly enhancing the efficacy of therapeutic monoclonal antibodies (mAbs), extensively used in the treatment of autoimmune and inflammatory disorders or cancer. Lysosomal targeting has gained increasing interest in recent years due to its pharmaceutical applications far beyond the treatment of lysosomal diseases, as a way to address proteins to the lysosome for eventual degradation. Mannose 6-phosphonate derivatives (M6Pn), called AMFA, are unique glycovectors that can significantly enhance the cellular internalization of the proteins conjugated to AMFA via the cation-independent mannose 6-phosphate receptor (M6PR) pathway. AMFA engineering of mAbs results in the generation of a bifunctional antibody that is designed to bind both the antigen and the M6PR. The improvement of the therapeutic potential by AMFA engineering was investigated using two antibodies directed against soluble antigens: infliximab (IFX), directed against tumor necrosis factor α (TNF-α), and bevacizumab (BVZ), directed against the vascular endothelial growth factor (VEGF). AMFA conjugations to the antibodies were performed either on the oligosaccharidic chains of the antibodies or on the lysine residues. Both conjugations were controlled and reproducible and provided a novel affinity for the M6PR without altering the affinity for the antigen. The grafting of AMFA to mAb increased their cellular uptake through an M6PR-dependent mechanism. The antigens were also 2.6 to 5.7 times more internalized by mAb-AMFA and rapidly degraded in the cells. Additional cell culture studies also proved the significantly higher efficacy of IFX-AMFA and BVZ-AMFA compared to their unconjugated counterparts in inhibiting TNF-α and VEGF activities. Finally, studies in a zebrafish embryo model of angiogenesis and in xenografted chick embryos showed that BVZ-AMFA was more effective than BVZ in reducing angiogenesis. These results demonstrate that AMFA grafting induces the degradation of soluble antigens and a significant increase in the therapeutic efficacy. Engineering with mannose 6-phosphate analogues has the potential to develop a new class of antibodies for autoimmune and inflammatory diseases.

The Perspective of Cancer Patients in Palliative Care on Unmet Needs: A Qualitative Synthesis Using Meta-Ethnography.

BACKGROUND: As cancer patients approach the end of life, their needs become more complex, increasing the demand for palliative care. Advanced-stage cancer patients encounter increasing unmet psychological, physical, autonomy, and communication needs, reflecting the difference between patients' perceived requirements and the support from health care professionals. The objective of this study was to synthesize qualitative evidence on unmet needs in palliative cancer care among inpatient and outpatient adults. METHODS: We conducted a meta-ethnographic review according to Noblit and Hare's framework and the operationalized guidelines developed by Sattar. The eMERGe Reporting Guidance was followed. A literature search was conducted in Cinahl, Embase, Medline, Scopus, Web of Science, PsycINFO and Google Scholar for gray literature. For all the studies, direct quotes from the participants and authors' results were identified, coded and analyzed in NVivo 1.7.1 and extracted as I and II order constructs from which higher third-order themes originated. RESULTS: Eight studies were included. Four new themes emerged, representing areas where palliative cancer care patients expressed a need for help: the need for comprehensive, patient-centered care, the need for maintaining a sense of autonomy and dignity, the need for attentive support to patients' soul and the need for accessible and timely care. CONCLUSIONS: Palliative care patients require a secure, suffering-free end-of-life journey with informed decision-making and team support. Ensuring continuity of care, validating their suffering, and allocating sufficient time are crucial aspects of care. This involves maintaining a consistent care plan, respecting patients' emotions and experiences, and providing services tailored to individual needs.

Cation-independent mannose 6-phosphate receptor: From roles and functions to targeted therapies.

The cation-independent mannose 6-phosphate receptor (CI-M6PR) is a ubiquitous transmembrane receptor whose main intracellular role is to direct enzymes carrying mannose 6-phosphate moieties to lysosomal compartments. Recently, the small membrane-bound portion of this receptor has appeared to be implicated in numerous pathophysiological processes. This review presents an overview of the main ligand partners and the roles of CI-M6PR in lysosomal storage diseases, neurology, immunology and cancer fields. Moreover, this membrane receptor has already been noted for its strong potential in therapeutic applications thanks to its cellular internalization activity and its ability to address pathogenic factors to lysosomes for degradation. A number of therapeutic delivery approaches using CI-M6PR, in particular with enzymes, antibodies or nanoparticles, are currently being proposed.

Barriers and facilitators of electronic patient-reported outcome measures (e-PROMs) for patients in home palliative cancer care: a qualitative study of healthcare professionals' perceptions.

BACKGROUND: Patient-reported outcomes in palliative care enable early monitoring and management of symptoms that most impact patients' daily lives; however, there are several barriers to adopting electronic Patient-reported Outcome Measures (e-PROMs) in daily practice. This study explored the experiences of health care professionals (HCPs) regarding potential barriers and facilitators in implementing e-PROMs in palliative cancer care at home. METHODS: This was a qualitative descriptive study. The data were collected from two focus groups structured according to the conceptual framework of Grol. HCPs involved in home palliative cancer care of Fondazione IRCCS Istituto Nazionale dei Tumori of Milan were enrolled. Data were analyzed using a reflexive thematic analysis. RESULTS: A total of 245 codes were generated, 171 for the first focus group and 74 for the second focus group. The results were subdivided into subthemes according to Grol's themes: Innovation, Individual professional, Patient, Social context, Organizational context, except Economic Political context. Nine HCPs attended the first focus group, and ten attended the second. According to these participants, e-PROMs could be integrated into clinical practice after adequate training and support of HCPs at all stages of implementation. They identified barriers, especially in the social and organizational contexts, due to the uniqueness of the oncological end-of-life setting and the intangible care interventions, as well as many facilitators for the innovation that these tools bring and for improved communication with the patient and the healthcare team. CONCLUSIONS: e-PROMs are perceived by HCPs as adding value to patient care and their work; however, barriers remain especially related to the fragility of these patients, the adequacy of technological systems, lack of education, and the risk of low humanization of care.

Mannose 6-phosphate receptor-targeting antibodies preserve Fc receptor-mediated recycling.

The concept of grafting mannose 6-phosphonate derivatives (M6Pn), named AMFA, on therapeutic proteins was first developed for the improvement of enzyme delivery in lysosomal storage disorders. This glycoengineering increases the cellular uptake of the protein via the cation-independent mannose 6-phosphate receptor (M6PR) which further allows their targeting to the lysosomes. In the present study, we investigated the extent to which the direct grafting of AMFA onto a drug, here a monoclonal antibody (mAb), affects the cell uptake and recycling of the antibody. The antibodies infliximab (IFX) and adalimumab (ADA), directed against the tumor necrosis factor α (TNFα), grafted with AMFA acquired an affinity for the M6PR, resulting in a >3-fold increase in drug release in cells. Subsequently, the impact of AMFA grafting to the Fc portion of mAb on its affinity for the neonatal Fc receptor (FcRn), which is the key receptor for antibody recycling, was evaluated. Whether one to three AMFA moieties were grafted, FcRn-mediated recycling of mAb was not affected. AMFA grafting did not impair the pharmacokinetics of both ADA and IFX and presented a high stability since AMFA were still bound to mAb in the plasma of mice 21 days after the treatment. In conclusion, this type of antibody engineering with a reduced number of AMFA confers M6PR targeting property and increases endocytosis, and yet appears fully compatible with FcRn binding and with antibody recycling and transcytosis.

Electronic patient-reported outcomes (e-PROMs) in palliative cancer care: a scoping review.

BACKGROUND: In palliative oncology settings, electronic patient-reported outcome (PRO) assessment can play an important role in supporting clinical activities for clinicians and patients. This scoping review aims to map the technological innovation of electronic patient-reported outcome measures (e-PROMs) in cancer palliative care and how PRO data collected through e-PROMs can influence the monitoring and management of symptoms and enable better communication between health professionals and patients. METHODS: A scoping review study was designed according to the Arksey and O'Malley framework. Medline, Embase, Web of Science, SCOPUS, PsycINFO and CINAHL and gray literature sources were consulted. The inclusion criteria were people over 18 years old receiving palliative and/or end-of-life care using e-PROMs. RESULTS: Thirteen primary studies were included: nine quantitative studies, two qualitative studies, and two mixed-method studies. The recently developed software that supports e-PROMs allows patients to receive feedback on their symptoms, helps clinicians prioritize care needs and monitors patients' conditions as their symptoms change. Electronic PRO data prompt difficult, end-of-life communication between clinicians and patients to better organize care in the last phase of life. CONCLUSION: This work shows that electronic PRO data assessment provides valuable tools for patients' well-being and the management of symptoms; only one study reported conflicting results. However, with studies lacking on how clinicians can use these tools to improve communication with patients, more research is needed.

Vegetable oil-based hybrid microparticles as a green and biocompatible system for subcutaneous drug delivery.

The aim of this study was to evidence the ability of vegetable oil-based hybrid microparticles (HMP) to be an efficient and safe drug delivery system after subcutaneous administration. The HMP resulted from combination of a thermostabilized emulsification process and a sol-gel chemistry. First of all, castor oil was successfully silylated by means of (3-Isocyanatopropyl)trimethoxysilane in solvent-free and catalyst-free conditions. Estradiol, as a model drug, was dissolved in silylated castor oil (ICOm) prior to emulsification, and then an optimal sol-gel crosslinking was achieved inside the ICOm microdroplets. The resulting estradiol-loaded microparticles were around 80 µm in size and allowed to entrap 4 wt% estradiol. Their release kinetics in a PBS/octanol biphasic system exhibited a one-week release profile, and the released estradiol was fully active on HeLa ERE-luciferase ERα cells. The hybrid microparticles were cytocompatible during preliminary tests on NIH 3T3 fibroblasts (ISO 10993-5 standard) and they were fully biocompatible after subcutaneous injection on mice (ISO 10993-6 standard) underlining their high potential as a safe and long-acting subcutaneous drug delivery system.

Efficient Photodynamic Therapy of Prostate Cancer Cells through an Improved Targeting of the Cation-Independent Mannose 6-Phosphate Receptor.

The aim of the present work is the development of highly efficient targeting molecules to specifically address mesoporous silica nanoparticles (MSNs) designed for the photodynamic therapy (PDT) of prostate cancer. We chose the strategy to develop a novel compound that allows the improvement of the targeting of the cation-independent mannose 6-phosphate receptor, which is overexpressed in prostate cancer. This original sugar, a dimannoside-carboxylate (M6C-Man) grafted on the surface of MSN for PDT applications, leads to a higher endocytosis and thus increases the efficacy of MSNs.

Combination treatment with proteasome inhibitors and antiestrogens has a synergistic effect mediated by p21WAF1 in estrogen receptor-positive breast cancer.

Although antiestrogens significantly improve the survival of patients with ER-positive breast cancer, therapeutic resistance remains a major limitation. The combinatorial use of antiestrogen with other therapies was proposed to increase their efficiency and more importantly, to prevent or delay the resistance phenomenon. In the present study, we addressed their combined effects with proteasome inhibitors (PIs). The effects of antiestrogens (hydroxyl-tamoxifen, raloxifen and fulvestrant) currently used in endocrine therapy were tested in combination with PIs, bortezomib or MG132, on the growth of three ER-positive breast cancer cell lines and in two cellular models of acquired antiestrogen resistance. When compared to single treatments, these combined treatments were significantly more effective in preventing the growth of the cell lines. The regulation of key cell cycle proteins, the cyclin-dependent kinase inhibitors, p21WAF1 and p27KIP1, were also studied. Bortezomib and MG132 drastically increased p21WAF1 expression through elevation of its mRNA concentration. Notably, p27KIP1 regulation was quite different from that of p21WAF1. Furthermore, the effect of bortezomib in combination with antiestrogen was evaluated on antiestrogen-resistant cell lines. The growth of two antiestrogen-resistant cell lines appeared responsive to proteasome inhibition and was strongly decreased by a combined therapy with an antiestrogen. Collectively, these findings provide new perspectives for the use of PIs in combination with endocrine therapies for breast cancer and possibly to overcome acquired hormonal resistance.

Dipeptide mimic oligomer transporter mediates intracellular delivery of Cathepsin D inhibitors: a potential target for cancer therapy.

Implication of the intracellular proteolytic activity of Cathepsin D (CathD), a lysosomal aspartyl-protease overexpressed in numerous solid tumors, has been evidenced on tumor growth. Its intracellular inhibition by potent inhibitors such as pepstatin constitutes a relevant but challenging molecular target. Indeed the potential of pepstatin as a therapeutic molecule is hampered by its too low intracellular penetration. We addressed this limitation by designing and developing a bioconjugate combining a pepstatin derivative with a new vector of cell penetration (CPNP) specifically targeting the endolysosomal compartment. We showed that this pepstatin conjugate (JMV4463) exhibited high anti-proliferative effect on tumor cell cultures via intracellular CathD inhibition and altered cell cycle associated with apoptotic events in vitro. When tested in mice xenografted with breast cancer cells, JMV4463 delayed tumor emergence and growth.

Estrogens promote cell-cell adhesion of normal and malignant mammary cells through increased desmosome formation.

The association of estrogen receptor alpha (ERα) expression with differentiated breast tumors presenting a lower metastasis risk could be explained by the estrogen modulation of cell adhesion, motility and invasiveness. Since desmosomes play a crucial role in cell-cell adhesion and may interfere in tumor progression, we studied their regulation by estrogens in human breast cancer and normal mammary cells. Estrogens increased the formation of desmosomes in normal and malignant cells. Furthermore, four desmosomal proteins (desmocollin, γ-catenin, plakophilin and desmoplakin) appeared significantly up-regulated by estrogens in three ERα-expressing cancer cell lines and this effect was reversed by a pure antiestrogen. Finally, silencing of ERα or desmoplakin expression by specific siRNA revealed that estrogen-modulated desmosomal proteins are essential for the estrogenic control of intercellular adhesion. This estrogen modulation of desmosome formation could contribute to the lower invasiveness of ERα-positive tumors and to the integrity of epithelial layers in estrogen target tissues.

Roles of estrogen receptor and p21(Waf1) in bortezomib-induced growth inhibition in human breast cancer cells.

Proteasome inhibitors such as bortezomib constitute novel therapeutic agents that are currently in clinical use and in clinical trials. In some neoplasms, cyclin-dependent kinase inhibitors (CKI) such as p21(WAF1) have been proposed as key targets of proteasome inhibitors. p21(WAF1) expression can be modulated by p53, a tumor suppressor, and especially in breast cancer cells, by estrogen receptor alpha (ERα), which is highly relevant to cancer growth. We investigated the effects of bortezomib using a panel of six cancer cell lines with variable status of ERα or p53 and found that bortezomib inhibited the growth of all cell lines in the same concentration range irrespective of the ERα expression or the mutational status of p53. Bortezomib treatment significantly enhanced p21(WAF1) protein levels in all cell lines but with different mechanisms according to ERα status. In ERα-positive cells, bortezomib treatment caused a strong increase in p21(WAF1) mRNA, whereas in ERα-negative cells it predominantly enhanced p21(WAF1) protein levels suggesting a posttranslational mechanism of p21(WAF1) regulation in the ERα-negative cells. Moreover, the antiproliferative activity of bortezomib was prevented by ERα silencing or p21(WAF1) knockdown in ERα-positive cells. Collectively, our results highlight the potential roles of ERα and p21(WAF1) in growth inhibition of cancer cells mediated by proteasome inhibitors, such as bortezomib.

Comparison between Culture Conditions Improving Growth and Differentiation of Blood and Bone Marrow Cells Committed to the Endothelial Cell Lineage.

The aim of this study was to compare different cell sources and culture conditions to obtain endothelial progenitor cells (EPCs) with predictable antigen pattern, proliferation potential and in vitro vasculogenesis. Pig mononuclear cells were isolated from blood (PBMCs) and bone marrow (BMMCs). Mesenchymal stem cells (MSCs) were also derived from pig bone marrow. Cells were cultured on fibronectin in the presence of a high concentration of VEGF and low IGF-1 and FGF-2 levels, or on gelatin with a lower amount of VEGF and higher IGF-1 and FGF-2 concentrations. Endothelial commitment was relieved in almost all PBMCs and BMMCs irrespective of the protocol used, whilst MSCs did not express a reliable pattern of EPC markers under these conditions. BMMCs were more prone to expand on gelatin and showed a better viability than PBMCs. Moreover, about 90% of the BMMCs pre-cultured on gelatin could adhere to a hyaluronan-based scaffold and proliferate on it up to 3 days. Pre-treatment of BMMCs on fibronectin generated well-shaped tubular structures on Matrigel, whilst BMMCs exposed to the gelatin culture condition were less prone to form vessel-like structures. MSCs formed rough tubule-like structures, irrespective of the differentiating condition used. In a relative short time, pig BMMCs could be expanded on gelatin better than PBMCs, in the presence of a low amount of VEGF. BMMCs could better specialize for capillary formation in the presence of fibronectin and an elevated concentration of VEGF, whilst pig MSCs anyway showed a limited capability to differentiate into the endothelial cell lineage.

Long-term treatment with N-acetylcysteine, but not caloric restriction, protects mesenchymal stem cells of aged rats against tumor necrosis factor-induced death.

The survival of mesenchymal stem cells (MSCs) to tumor necrosis factor alpha (TNFalpha) stimulation was evaluated after a long-term antioxidant treatment, or caloric restriction, in aged rats. MSCs were isolated from bone marrow of 30-month-old rats which orally received N-acetylcysteine in the last 18 months. The necrotic cell death-induced in vitro by TNFalpha, determined by trypan blue exclusion, was markedly attenuated in MSCs obtained from treated vs. control aged rats (percent mean+/-SEM: 10.9+/-2.17 vs. 17.8+/-0.53; p<0.05). Also, the proliferation rate of MSCs from control, but not N-acetylcysteine-treated, aged rats evaluated up to 2 weeks was significantly higher than that of MSCs from younger (4-month-old) rats. No significant effect was observed relative to the parameters investigated when the aged rats were previously subjected to a hypocaloric diet for 18 months. In conclusion, a prolonged supplementation with N-acetylcysteine in rats can increase resistance to necrotic death of MSCs and may also counteract an excessive rate of MSC proliferation.