1
|
Knakiewicz M, Wójcik K, Stala M, Morajko A, Paul M. Anatomic study of propeller flaps based on perforators of the posterior tibial artery. J Plast Reconstr Aesthet Surg 2024; 101:77-83. [PMID: 39709876 DOI: 10.1016/j.bjps.2024.11.051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2024] [Revised: 11/24/2024] [Accepted: 11/25/2024] [Indexed: 12/24/2024]
Abstract
Lower limb injuries resulting from sports activities, industrial accidents, and traffic incidents represent a significant global healthcare challenge. These injuries often entail a high risk of complications, especially when fractures are associated with substantial soft tissue damage. Open fractures classified as Gustilo type II or III are particularly susceptible to complications such as fistula and osteomyelitis. Globally, millions of lower limb injuries are reported annually, leading to considerable morbidity and escalating healthcare costs. The standard treatment for shin ulcers with bone exposure involves the debridement of necrotic tissue, followed by coverage of the defect with well-vascularized tissue. Classical flaps are employed in certain cases; however, their applicability, along with techniques such as pedicled muscle flaps from the rectus abdominis or tensor fasciae latae muscles, depends on the extent and location of the injury. Classical flaps are employed in certain cases, but their applicability depends on the extent and location of the injury. Given these limitations, propeller flaps have emerged as highly effective alternatives for microsurgical reconstruction in lower limb recovery. The objective of our study was to delineate the anatomy and demonstrate the utility of propeller flaps based on the perforators of the posterior tibial artery. By providing detailed anatomical insights, we aimed to highlight the strategic advantages of propeller flaps in complex lower limb reconstruction cases.
Collapse
|
2
|
Klara J, Onak S, Kowalczyk A, Wójcik K, Lewandowska-Łańcucka J. Photocrosslinked gelatin/chondroitin sulfate/chitosan-based composites with tunable multifunctionality for bone tissue regeneration. Int J Biol Macromol 2024; 271:132675. [PMID: 38845259 DOI: 10.1016/j.ijbiomac.2024.132675] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2023] [Revised: 05/21/2024] [Accepted: 05/24/2024] [Indexed: 06/20/2024]
Abstract
Novel hydrogel-based multifunctional systems prepared utilizing photocrosslinking and freeze-drying processes (PhotoCross/Freeze-dried) dedicated for bone tissue regeneration are presented. Fabricated materials, composed of methacrylated gelatin, chitosan, and chondroitin sulfate, possess interesting features including bioactivity, biocompatibility, as well as antibacterial activity. Importantly, their degradation and swellability might be easily tuned by playing with the biopolymeric content in the photocrosllinked systems. To broaden the potential application and deliver the therapeutic features, mesoporous silica particles functionalized with methacrylate moieties decorated with hydroxyapatite and loaded with the antiosteoporotic drug, alendronate, (MSP-MA-HAp-ALN) were dispersed within the biopolymeric sol and photocrosslinked. It was demonstrated that the obtained composites are characterized by a significantly extended degradation time, ensuring optimal conditions for balancing hybrids removal with the deposition of fresh bone. We have shown that attachment of MSP-MA-HAp-ALN to the polymeric matrix minimizes the initial burst effect and provides a prolonged release of ALN (up to 22 days). Moreover, the biological evaluation in vitro suggested the capability of the resulted systems to promote bone remodeling. Developed materials might potentially serve as scaffolds that after implantation will fill up bone defects of various origin (osteoporosis, tumour resection, accidents) providing the favourable conditions for bone regeneration and supporting the infections' treatment.
Collapse
|
3
|
Florczyk A, Krajcer A, Wójcik K, Lewandowska-Łańcucka J. Innovative Vancomycin-Loaded Hydrogel-Based Systems - New Opportunities for the Antibiotic Therapy. Int J Nanomedicine 2024; 19:3991-4005. [PMID: 38720939 PMCID: PMC11078026 DOI: 10.2147/ijn.s443051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2023] [Accepted: 04/17/2024] [Indexed: 05/12/2024] Open
Abstract
Purpose Surgical site infections pose a significant challenge for medical services. Systemic antibiotics may be insufficient in preventing bacterial biofilm development. With the local administration of antibiotics, it is easier to minimize possible complications, achieve drugs' higher concentration at the injured site, as well as provide their more sustained release. Therefore, the main objective of the proposed herein studies was the fabrication and characterization of innovative hydrogel-based composites for local vancomycin (VAN) therapy. Methods Presented systems are composed of ionically gelled chitosan particles loaded with vancomycin, embedded into biomimetic collagen/chitosan/hyaluronic acid-based hydrogels crosslinked with genipin and freeze-dried to serve in a flake/disc-like form. VAN-loaded carriers were characterized for their size, stability, and encapsulation efficiency (EE) using dynamic light scattering technique, zeta potential measurements, and UV-Vis spectroscopy, respectively. The synthesized composites were tested in terms of their physicochemical and biological features. Results Spherical structures with sizes of about 200 nm and encapsulation efficiencies reaching values of approximately 60% were obtained. It was found that the resulting particles exhibit stability over time. The antibacterial activity of the developed materials against Staphylococcus aureus was established. Moreover, in vitro cell culture study revealed that the surfaces of all prepared systems are biocompatible as they supported the proliferation and adhesion of the model MG-63 cells. In addition, we have demonstrated significantly prolonged VAN release while minimizing the initial burst effect for the composites compared to bare nanoparticles and verified their desired physicochemical features during swellability, and degradation experiments. Conclusion It is expected that the developed herein system will enable direct delivery of the antibiotic at an exposed to infections surgical site, providing drugs sustained release and thus will reduce the risk of systemic toxicity. This strategy would both inhibit biofilm formation and accelerate the healing process.
Collapse
|
4
|
Klara J, Onak S, Kowalczyk A, Horak W, Wójcik K, Lewandowska-Łańcucka J. Towards Controlling the Local Bone Tissue Remodeling-Multifunctional Injectable Composites for Osteoporosis Treatment. Int J Mol Sci 2023; 24:ijms24054959. [PMID: 36902390 PMCID: PMC10002562 DOI: 10.3390/ijms24054959] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Revised: 02/22/2023] [Accepted: 02/28/2023] [Indexed: 03/08/2023] Open
Abstract
Alendronate (ALN) is the most commonly prescribed oral nitrogen-containing bisphosphonate for osteoporosis therapy. However, its administration is associated with serious side effects. Therefore, the drug delivery systems (DDS) enabling local administration and localized action of that drug are still of great importance. Herein, a novel multifunctional DDS system based on the hydroxyapatite-decorated mesoporous silica particles (MSP-NH2-HAp-ALN) embedded into collagen/chitosan/chondroitin sulfate hydrogel for simultaneous osteoporosis treatment and bone regeneration is proposed. In such a system, the hydrogel serves as a carrier for the controlled delivery of ALN at the site of implantation, thus limiting potential adverse effects. The involvement of MSP-NH2-HAp-ALN in the crosslinking process was established, as well as the ability of hybrids to be used as injectable systems. We have shown that the attachment of MSP-NH2-HAp-ALN to the polymeric matrix provides a prolonged ALN release (up to 20 days) and minimizes the initial burst effect. It was revealed that obtained composites are effective osteoconductive materials capable of supporting the osteoblast-like cell (MG-63) functions and inhibiting osteoclast-like cell (J7741.A) proliferation in vitro. The purposely selected biomimetic composition of these materials (biopolymer hydrogel enriched with the mineral phase) allows their biointegration (in vitro study in the simulated body fluid) and delivers the desired physicochemical features (mechanical, wettability, swellability). Furthermore, the antibacterial activity of the composites in in vitro experiments was also demonstrated.
Collapse
|
5
|
Machowska A, Klara J, Ledwójcik G, Wójcik K, Dulińska-Litewka J, Karewicz A. Clindamycin-Loaded Halloysite Nanotubes as the Antibacterial Component of Composite Hydrogel for Bone Repair. Polymers (Basel) 2022; 14:polym14235151. [PMID: 36501546 PMCID: PMC9739121 DOI: 10.3390/polym14235151] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Revised: 11/16/2022] [Accepted: 11/22/2022] [Indexed: 11/30/2022] Open
Abstract
A new drug delivery system consisting of clindamycin phosphate entrapped in acid-etched halloysite nanotubes was successfully prepared and characterized. It was then used as an antibacterial component of the multicomponent hydrogel designed as a material for bone regeneration. First, halloysite (HNT) was etched and clindamycin phosphate (CP) was entrapped in both raw and modified nanotubes, resulting in HNT-CP and EHNT-CP systems. They were characterized using SEM, TEM, TGA and FTIR; the entrapment efficiency and release of CP from both systems were also studied. EHNT-CP was then used as an antibacterial component of the two hydrogels composed of alginate, collagen and β-TCP. The hydrogels were prepared using different crosslinking procedures but had the same composition. The morphology, porosity, degradation rate, CP release profile, cytocompatibility, antibacterial activity and ability to induce biomineralization were studied for both materials. The hydrogel obtained by a chemical crosslinking with EDC followed by the physical crosslinking with calcium ions had better properties and was shown to have potential as a bone repair material.
Collapse
|
6
|
Kowalczyk P, Tomczyk T, Arenciba J, Milewicz M, Skalska J, Trębicka D, Poniatowska K, Adamczyk J, Wójcik K, Cottens S, Dobrzański P, Biśta M, Brach K, Drewniak-Świtalska M, Tracz A, Pastok M, Górecka K, Chrzanowska K, Kaczanowska K, Walczak M. 36P Preclinical evaluation of novel MCL-1 degrader in in vitro and in vivo cancer models. Ann Oncol 2022. [DOI: 10.1016/j.annonc.2022.10.046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2022] Open
|
7
|
Tomczyk T, Arencibia J, Milewicz M, Trębicka D, Skalska J, Poniatowska K, Adamczyk J, Wójcik K, Cottens S, Kowalczyk P, Dobrzański P, Biśta M, Brach K, Świtalska-Drewniak M, Tracz A, Pastok M, Górecka-Minakowska K, Chrzanowska K, Takagi T, Walczak M. Development of selective MCL-1 heterobifunctional degraders. Eur J Cancer 2022. [DOI: 10.1016/s0959-8049(22)01076-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
8
|
Wójcik K, Ćmiel A, Satława T, Lichołai S, Wawrzycka-Adamczyk K, Biedroń G, Masiak A, Zdrojewski Z, Storoniak H, Bułło-Piontecka B, Dębska-Ślizień A, Jeleniewicz R, Majdan M, Jakuszko K, Augustyniak-Bartosik H, Krajewska M, Brzosko I, Brzosko M, Kur-Zalewska J, Tłustochowicz W, Madej M, Hawrot-Kawecka A, Kucharz E, Głuszko P, Wisłowska M, Miłkowska-Dymanowska J, Lewandowska-Polak A, Makowska J, Zalewska J, Gubała T, Malawski M, Musiał J. POS0253 PERSONALIZED RISK EVALUATION FOR OUTCOME PREDICTION IN ANCA ASSOCIATED VASCULITIS (AAV) USING LATENT CLASS ANALYSIS AND MACHINE LEARNING. Ann Rheum Dis 2022. [DOI: 10.1136/annrheumdis-2022-eular.1089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
BackgroundANCA associated vasculitides (AAV) are a heterogeneous group of rare diseases with unknown etiology. In the most severe cases AAV can lead to end stage kidney disease or death. Since etiology and detailed pathogenesis of AAV is not known, the prediction of disease outcome at the time of diagnosis is challenging. Thus, there is an unmet need for tools to identify patients with the highest risk of organ dysfunction and death and apply effective personalized therapy.ObjectivesThe aim of this work was to search for tools allowing outcome prediction at the time of AAV diagnosis. Early identification of patients, who are likely to develop severe organ dysfunction and death is crucial for appropriate disease management. Induction therapy in AAV relays on immunosuppressive drugs characterized by a high risk of severe side effects. Thus, their administration in high doses should be limited only to individual patients with an especially high risk of poor outcome.MethodsWe applied here two methods of identification of AAV patients at risk to develop severe organ dysfunction and death. First method (latent class analysis [LCA] followed by logistic regression) was meant to subcategorize patients and identify a subgroup at subjects at risk to develop chronic renal replacement therapy (CRRT) and death [1]. Second, served to assess individual poor outcome risk and was based on two machine learning (ML) classifiers, which by analyzing clinical information allow assigning computed risk for CRRT and death in an individual patient allowing to identify subjects with high risk of chronic replacement therapy (CRRT) and death. We have evaluated a number of different approaches to build the ML models (including logistic regression, support vector machines, random forests), and obtained the best results for the gradient boosting algorithm implementation called LightGBM [2]. It works as a sequential ensemble of so-called weak learners (decision trees) finally combined in a one prediction model. Both analyses were based on retrospective data from Polish national AAV registry (POLVAS) [3] including presently 565 GPA and 135 MPA patients. The parameters used were: demographic data and laboratory parameters, specific organ involvement, ANCA specificity and time between selected stages of the disease.ResultsLCA used on our AAV cohort identified four subphenotypes – three already previously proposed - and revealing a fourth clinically relevant subphenotype. This new subphenotype includes only GPA patients, usually diagnosed at a younger age as compared to other groups, and characterized by multiorgan involvement, high relapse rate, relatively high risk of death, but no end-stage kidney disease. Logistic regression analysis revealed significant differences in the risk of CRRT and death between those subphenotypes – the worst prognosis was found for severe MPO AAV. On the other hand, using ML approach we obtained an individual prediction model with potentially relevant clinical performance (ROC AUC of 0.85 for CRRT and 0.82 for death).ConclusionWe consider results obtained encouraging. They may offer a new insight into AAV course based on data available at diagnosis, and create a solid foundation for potential clinical decision support system.References[1]Wójcik K et al. Subphenotypes of ANCA-associated vasculitis identified by latent class analysis. Clin Exp Rheumatol. 2021 Mar-Apr;39 Suppl 129(2):62-68.[2]Ke G, at al. Light GBM: A Highly Efficient Gradient Boosting Decision Tree. Advances in Neural Information Processing Systems 30 (NIPS 2017), pp. 3149-3157.[3]Wójcik K et al. Clinical characteristics of Polish patients with ANCA-associated vasculitides-retrospective analysis of POLVAS registry. Clin Rheumatol. 2019 Sep;38(9):2553-2563.AcknowledgementsThis work was supported by a grant from Polish National Science Center UMO-2018/31/B/NZ6/03898Disclosure of InterestsNone declared
Collapse
|
9
|
Lichołai S, Wójcik K, Wawrzycka-Adamczyk K, Surmiak M, Korkosz M, Musiał J. AB0150 CIRCULARRNA AS A POTENTIAL BIOMARKER OF GRANULOMATOSIS WITH POLYANGIITIS. Ann Rheum Dis 2022. [DOI: 10.1136/annrheumdis-2022-eular.5072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
BackgroundGranulomatosis with polyangiitis (GPA) belong to ANCA-associated vasculitides, a heterogeneous group of disorders whose clinical presentation ranges from isolated lesions affecting a single organ to life-threatening conditions. The etiology of the disease is not fully understood, and there is a lack of reliable and unambiguous diagnostic and prognostic markers.Research in recent years points to the potential use of circulating free nucleic acids as a potential biomarkers in human pathology. Circular RNAs (circRNAs) belong to the group of non-coding RNAs, a group of potentially regulatory RNAs generated by linkage between a downstream 3′ splice site and an upstream 5′ splice site in a process known as backsplicing. CircRNAs were found in in nearly all tissues and recently have been reported to regulate gene expression by sponging miRNA. However their role in specific human conditions is largely unknown.ObjectivesThe aim of our study was to assess the potential role of circRNA in diagnosis and monitoring of GPA.MethodsCircRNAs were selected using bioinformatic analysis of RNA-seq data. Serum samples were obtained from 30 patients with GPA and 30 healthy controls. Levels of circRNA weres assessed using qPCR with specific primers and probes. Statistical analysis was performed using dedicated packages for R and R Studio software.ResultsLevels of at least 10 serum circRNAs distinguished GPA patients from controls and 6 of them reached statistical significance. There was also an apparent difference in the levels of selected molecules between GPA exacerbation and remission (hsa_circ_0015167 – RQ 5.97, p<0.05; hsa_circ_0045266 – RQ 4.53, p<0.05). CircRNAs that differentiate patients from healthy individuals were associated with genes for P-selectin, VCAM and interleukins, among others. In contrast, molecules derived from catherins do not differentiate between the study and control groups.ConclusionOur results suggest that circRNA could be potentially used as a biomarker facilitating GPA diagnosis. Moreover, the observed differences depending on the stage of the disease could allow for monitoring the disease and predicting its progression. The association of molecules which levels differ between the test and control groups with genes previously associated with the development of the disease strongly suggests their potential involvement in its pathogenesis, which in turn strengthens the diagnostic specificity of the proposed markers.AcknowledgementsThis research was supported by National Center of Science, grant number 2018/31/B/NZ6/03898.Disclosure of InterestsNone declared
Collapse
|
10
|
Wójcik K, Masiak A, Zdrojewski Z, Jeleniewicz R, Majdan M, Brzosko I, Brzosko M, Madej M, Jakuszko K, Kur-Zalewska J, Tłustochowicz W, Storoniak H, Bułło-Piontecka B, Dębska-Ślizień A, Hawrot-Kawecka A, Głuszko P, Stasiek M, Wisłowska M, Kucharz E, Musiał J. AB0820 INFLUENCE OF ANCA ANTIBODIES ON DEMOGRAPHIC AND CLINICAL CHARACTERISTIC OF AAV. Ann Rheum Dis 2021. [DOI: 10.1136/annrheumdis-2021-eular.1560] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Background:ANCA associated vasculitides (AAV) are a heterogeneous group of rare diseases with unknown etiology and the broad clinical spectrum ranging from life-threatening systemic disease, through single organ involvement to minor isolated skin changes. Unfortunately the clinical classification, ANCA specificity or genetic characteristics alone is not able to categorize AAV patients in a satisfactory manner. As a consequence advanced statistical techniques were used to identify and stratify AAV subphenotypes [1, 2]. Here we have analyzed influence of the ANCA type on clinical manifestations and demographic characteristics in various types of AAV, based on data from the POLVAS registryObjectives:We decided to retrospectively analyze a large cohort of Polish AAV patients deriving from several referral centers – members of the Scientific Consortium of the Polish Vasculitis Registry (POLVAS) – and concentrate on demographic and clinical characteristics of anti-PR3 and anti-MPO positive patients regardless of their clinical diagnosis.Methods:We conducted a systematic multicenter retrospective study of adult patients diagnosed with AAV between Jan 1990 and Dec 2016. Patients were enrolled by 9 referral centers. We analyzed dichotomous variables: gender; ANCA status – anti-PR3+ or anti-MPO+, ANCA negative; organ involvement - skin, eye, ENT, respiratory, heart, GI, renal, urinary, CNS, peripheral nerves and polytomous variable (number of relapses), supported by quantitative covariates (e.g., age at diagnosis, CRP at diagnosis, maximal serum creatinine concentration ever)[3].Results:MPO-positive patients (both GPA and EGPA phenotype) were older at the time of diagnosis with a substantial percentage diagnosed > 65 years of age, and with high rate of renal involvement. Interestingly, while in the whole group of patients diagnosed with EGPA male to female ratio was 1:2, the MPO+ EGPA patients showed M:F ratio of 1:1.The analysis of ANCA negative AAV reveled significant differences in GPA, ANCA negative group is characterized with significantly lower frequency of renal involvement compared to rest GPA (11,5% vs 63,7%) p<0,05 what should be emphasized ANCA negative AAV never lead to ESRD (end stage renal disease) or even transient dialysis.Conclusion:ANCA specificity is indispensable as a separate variable in any clinically relevant analysis of AAV subcategories. MPO+ group is characterized by older age at time of diagnosis, male to female ration 1:1, kidney involvement, and shows more homogenous clinical phenotype than PR3+ AAV patients. In our group ANCA negative AAV never lead to ESRD (end stage renal disease) or even transient dialysis.References:[1]Mahr A, Specks U, Jayne D. Subclassifying ANCA-associated vasculitis: a unifying view of disease spectrum. Rheumatol Oxf Engl 2019;58:1707–9. https://doi.org/10.1093/rheumatology/kez148.[2]Wójcik K, Biedroń G, Wawrzycka-Adamczyk K, Bazan-Socha S, Ćmiel A, Zdrojewski Z et al. Subphenotypes of ANCA-associated vasculitis identified by latent class analysis. Clin Exp Rheumatol. 2020 Sep 1. Epub PMID: 32896241.[3]Wójcik K, Wawrzycka-Adamczyk K, Włudarczyk A, Sznajd J, Zdrojewski Z, Masiak A, et al. Clinical characteristics of Polish patients with ANCA-associated vasculitides—retrospective analysis of POLVAS registry. Clinical Rheumatology. 1 wrzesień 2019;38(9):2553–63.Disclosure of Interests:None declared
Collapse
|
11
|
Masiak A, Ziętkiewicz M, Wójcik K, Wawrzycka-Adamczyk K, Madej M, Kur-Zalewska J, Wisłowska M, Storoniak H, Komorniczak M, Brzosko I, Brzosko M, Dębska-Ślizień A, Musiał J, Zdrojewski Z. SAT0265 RISK FACTORS FOR INFECTIOUS COMPLICATIONS FOLLOWING RITUXIMAB TREATMENT – MULTICENTER POLISH EXPERIENCE. Ann Rheum Dis 2020. [DOI: 10.1136/annrheumdis-2020-eular.2930] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Background:Rituximab (RTX) is a B cell depleting monoclonal antibody with proven efficacy in the treatment of ANCA-associated vasculitis (AAV). The infectious complications occur in 15-25%.Objectives:We aimed to assess the frequency and risk factors of infections in patients with AAV receiving RTX among Polish patients.Methods:7 tertiary referral centers experienced in the treatment of vasculitis completed a questionnaire regarding AAV patients treated with RTX.Results:Among 49 patients included in the analysis (47 with GPA, 2 with MPA; 36/73% men; mean age at diagnosis 42,45±14,9 yrs., mean age on RTX initiation 46,14±14,72 yrs.,) at least one infection occurred in 20 patients (40.82%) after mean time of 16,65±16,01 weeks since the administration of RTX. Patients were followed for a mean time of 26,88±21,94 months. There were no differences in the incidence of infectious complications by gender, age, BMI, smoking status, severity of the disease, activity of the disease (BVAS), time from diagnosis to RTX initiation, carriage of staphylococcus aureus in the upper respiratory tract, total dose of CYC before RTX treatment. We didn’t observe severe hypogammaglobulinemia or neutropenia after RTX treatment. 40% of the observed infections occurred during the first month, 35% between second and sixth month of follow-up, while 25% were observed between 6 and 12 months after the RTX initiation. Of the 20 patients who developed infection, 12 (24.5%) had further infections. Antibiotic prophylaxis with trimethoprim–sulfamethoxazole was administered in 40 out of 49 (81.63%). Upper respiratory tract infection was the most common infectious complication (n=11), followed by lower respiratory tract (n=4), soft tissues (n=4) and urinary tract infections (n=4), lacrimal gland abscess (n=2) and abdomen (n=1). In cases with a positive microbial result Staphylococcus aureus (n=4), Klebsiella pneumoniae (n=2), Pseudomonas aeruginosa (n=1), Candida (n=1) and others (n=6) were identified. No fatalities were recorded and only 3 patients had severe infection with the necessity of prolonged treatment.Conclusion:Despite the high number of infections in our group treated with RTX, most of them were not severe. Upper respiratory tract was the most common site of infection.Disclosure of Interests:None declared
Collapse
|
12
|
Wójcik K, Ćmiel A, Masiak A, Zdrojewski Z, Jeleniewicz R, Majdan M, Brzosko I, Brzosko M, Głuszko P, Stasiek M, Wisłowska M, Kur-Zalewska J, Madej M, Hawrot-Kawecka A, Storoniak H, Bułło-Piontecka B, Dębska-Ślizień A, Kucharz E, Jakuszko K, Musiał J. FRI0223 SUBPHENOTYPES OF ANCA ASSOCIATED VASCULITIS IDENTIFIED BY LATENT CLASS ANALYSIS. Ann Rheum Dis 2020. [DOI: 10.1136/annrheumdis-2020-eular.832] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Background:ANCA associated vasculitides (AAV) are a heterogeneous group of rare diseases with unknown etiology and the clinical spectrum ranging from life-threatening systemic disease, through single organ involvement to minor isolated skin changes. Thus there is an unmet need for phenotype identification especially among patients with granulomatosis with polyangiitis GPA, patients with microscopic polyangiitis MPA group seems to be more uniform. Recently, based on previous clustering analysis and clinical, histopathological, serological and prognostic aspects three subcategories of AAV have been proposed and named as: non-severe AAV, severe PR3-AAV and severe MPO-AAV [1].Objectives:In line with these attempts to subcategorize AAV we decided to use latent class analysis (LCA) on a large multicenter cohort of polish AAV patients from POLVAS [2] registry to identify potential new subphenotypes or confirm already proposed ones.Methods:Latent Class Analysis (LCA) approach was used as a model based clustering method of objects described by dichotomous (e.g., gender; ANCA status – cANCA, pANCA; organ involvement - skin, eye, ENT, respiratory, heart, GI, renal, urinary, CNS, peripheral nerves) and polytomous (number of relapses) variables supported by quantitative covariates (e.g., age at diagnosis, CRP at diagnosis, maximal serum creatinine concentration ever).Results:Results of LCA on our AAV group returned four class model of AAV subphenotypes, confirming existence of the previously proposed by Mahr at al. [1] and revealed fourth – previously not described clinically relevant subphenotype. To this fourth class - belong patients only with GPA, diagnosed at young age, with multiorgan involvement, high relapse rate and relatively high risk of death.Table 1.AAV subcategorization – summary of clinical characteristics and ANCA specificityLCA Class 1LCA Class 2LCA Class 3LCA Class 4No of patients13019410297AAV typeMainly GPAMainly GPAmainly MPAOnly GPAAge at diagnosisMiddle ageMiddle ageOldYoungMale/female ratio1:22:11:11:1Main organ involvementENT, respiratory, eyeRenal, respiratory, ENTRenal, respiratory, skinMultiorgan involvementRelapse rateintermediateintermediatelowhighModified class description (based on ref. [1])Non severe AAVSevere PR3 AAVSevere MPO AAVSevere non-renalPR3 AAVConclusion:Based on multiple clinical and serological variables LCA methodology identified 4-class subphenotypes model of AAV. Fourth-class is a new clinically important subphenotype including exclusively PR3-positive young AAV patients with multiorgan involvement, high risk of relapse and distinct mortality.References:[1]Mahr A, Specks U, Jayne D. Subclassifying ANCA-associated vasculitis: a unifying view of disease spectrum. Rheumatol Oxf Engl 2019;58:1707–9.https://doi.org/10.1093/rheumatology/kez148.[2]Wójcik K, Wawrzycka-Adamczyk K, Włudarczyk A, Sznajd J, Zdrojewski Z, Masiak A, i in. Clinical characteristics of Polish patients with ANCA-associated vasculitides—retrospective analysis of POLVAS registry. Clinical Rheumatology. 1 wrzesień 2019;38(9):2553–63.Disclosure of Interests:Krzysztof Wójcik: None declared, Adam Ćmiel: None declared, Anna Masiak: None declared, Zbigniew Zdrojewski: None declared, Radoslaw Jeleniewicz: None declared, Maria Majdan Consultant of: Roche, Amgen, Speakers bureau: Roche, Amgen, Iwona Brzosko: None declared, Marek Brzosko: None declared, Piotr Głuszko: None declared, Małgorzata Stasiek: None declared, Małgorzata Wisłowska: None declared, Joanna Kur-Zalewska: None declared, Marta Madej: None declared, Anna Hawrot-Kawecka: None declared, Hanna Storoniak: None declared, Barbara Bułło-Piontecka: None declared, Alicja Dębska-Ślizień: None declared, Eugeniusz Kucharz: None declared, Katarzyna Jakuszko: None declared, Jacek Musiał: None declared
Collapse
|
13
|
Masiak A, Ziętkiewicz M, Wójcik K, Wawrzycka-Adamczyk K, Jeleniewicz R, Madej M, Kur-Zalewska J, Jakuszko K, Wisłowska M, Storoniak H, Komorniczak M, Bułło-Piontecka B, Brzosko I, Stasiek M, Kucharz E, Dębska-Ślizień A, Majdan M, Musiał J, Zdrojewski Z. FRI0210 ORBITAL PSEUDOTUMOR AMONG PATIENTS WITH GRANULOMATOSIS WITH POLYANGIITIS – DATA FROM THE POLISH REGISTRY POLVAS. Ann Rheum Dis 2020. [DOI: 10.1136/annrheumdis-2020-eular.2881] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Background:Orbital inflammatory masses have been described as the common manifestation of granulomatosis with polyangiitis (GPA) occuring in 7- 45% of patients.Objectives:Identification and characterization of patients with orbital pseudotumor among Polish patients based on the national vasculitis registry, POLVAS.Methods:Clinical presentation and management of all GPA patients fulfilling ACR criteria or Chapel Hill Consensus Conference definition included to the Polish registry POLVAS who developed orbital masses in the course of GPA were evaluated.Results:Ocular involvement was found in 114 (27%) of 417 GPA patients registered in POLVAS, 34 (8%) developed orbital masses. Mean patients’ age was 47.8 (range from 19-75) yrs., 23 (67%) were women. Forty four per cent of the patients developed tumor at the beginning of the disease, 56% during relapse. Patients’ characteristics on diagnosis of orbital mass: 24 cANCA, 2 pANCA, and 8 ANCA negative, 9% active smokers and 31% past smokers, 29% had localized disease, 21% early systemic and 50% systemic with organ involvement, 29% had other type of ophthalmological involvement before pseudotumor occurred, 88% had active paranasal sinus involvement, 41% lungs, 15% CNS, 15% skin and 6% heart manifestations. Thirty seven per cent of patients had positive nasal swabs cultures, 50% of which were positive for Staphylococcus aureus. In 65%, tumor occurred during steroid therapy (46% had prednisone more than 5mg/d) and 45% on immunosuppressive treatment (19% when treated with AZA, 16% MTX, 6,5% MMF and 3,5% CYC). Due to orbital mass 86.5% were treated with CYC and 13.5% with RTX. Twenty one per cent had complete remission of the pseudotumor, 76% partial remission and in 3% patients there was no response to the treatment; 43% developed visual impairment, 20% suffered from blindness.Conclusion:Orbital inflammatory mass was not common manifestation of GPA among our patients. The mass developed at the beginning or in the course of the disease, even during immunosuppressive treatment. Orbital masses have been resistant to therapeutic interventions and were accompanied by high risk of visual impairment.Disclosure of Interests:Anna Masiak: None declared, Marcin Ziętkiewicz: None declared, Krzysztof Wójcik: None declared, Katarzyna Wawrzycka-Adamczyk: None declared, Radoslaw Jeleniewicz: None declared, Marta Madej: None declared, Joanna Kur-Zalewska: None declared, Katarzyna Jakuszko: None declared, Małgorzata Wisłowska: None declared, Hanna Storoniak: None declared, Michał Komorniczak: None declared, Barbara Bułło-Piontecka: None declared, Iwona Brzosko: None declared, Małgorzata Stasiek: None declared, Eugeniusz Kucharz: None declared, Alicja Dębska-Ślizień: None declared, Maria Majdan Consultant of: Roche, Amgen, Speakers bureau: Roche, Amgen, Jacek Musiał: None declared, Zbigniew Zdrojewski: None declared
Collapse
|
14
|
Gilarska A, Lewandowska-Łańcucka J, Guzdek-Zając K, Karewicz A, Horak W, Lach R, Wójcik K, Nowakowska M. Bioactive yet antimicrobial structurally stable collagen/chitosan/lysine functionalized hyaluronic acid - based injectable hydrogels for potential bone tissue engineering applications. Int J Biol Macromol 2019; 155:938-950. [PMID: 31712140 DOI: 10.1016/j.ijbiomac.2019.11.052] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2019] [Accepted: 11/07/2019] [Indexed: 02/01/2023]
Abstract
Novel, biocompatible, multifunctional, injectable genipin crosslinked collagen/chitosan/lysine-modified hyaluronic acid based hydrogels (ColChHAmod) were prepared in a facile, one-step procedure. The novelty of the current approach lies in the functionalization of hyaluronic acid (HA) with primary amine groups by lysine attachment, and its further use as a component of the injectable sol. The obtained derivative, HAmod, could form, upon crosslinking with genipin, covalent bonds with other components of the hydrogel network, resulting in structurally stable, better-defined hydrogels. We have demonstrated that, by adjusting HAmod content and genipin concentration, hydrogels with tunable physicochemical characteristics (swelling, wettability, tendency for enzymatic degradation) and properties adequate for the potential bone tissue regeneration can be prepared. Storage modulus measurements indicated that HAmod has positive effect on mechanical characteristics of hydrogels prepared. It was also revealed that the ColChHAmod-based hydrogels are characterized by a high porosity (85-95%). The in situ rheological measurements confirmed the injectability of the obtained hydrogels. The in vitro cell culture studies showed that the surface of all materials prepared was biocompatible, as they supported proliferation and adhesion of osteoblast-like cells followed by ALP expression. The intrinsic antibacterial activity of the hydrogels against Escherichia coli was also demonstrated in in vitro experiment.
Collapse
|
15
|
Golda A, Kosikowska-Adamus P, Kret A, Babyak O, Wójcik K, Dobosz E, Potempa J, Lesner A, Koziel J. The Bactericidal Activity of Temporin Analogues Against Methicillin Resistant Staphylococcus aureus. Int J Mol Sci 2019; 20:ijms20194761. [PMID: 31557917 PMCID: PMC6801822 DOI: 10.3390/ijms20194761] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Revised: 09/20/2019] [Accepted: 09/23/2019] [Indexed: 12/14/2022] Open
Abstract
Staphylococcus aureus is a major infectious agent responsible for a plethora of superficial skin infections and systemic diseases, including endocarditis and septic arthritis. Recent epidemiological data revealed the emergence of resistance to commonly used antibiotics, including increased numbers of both hospital- and community-acquired methicillin-resistant S. aureus (MRSA). Due to their potent antimicrobial functions, low potential to develop resistance, and immunogenicity, antimicrobial peptides (AMPs) are a promising alternative treatment for multidrug-resistant strains. Here, we examined the activity of a lysine-rich derivative of amphibian temporin-1CEb (DK5) conjugated to peptides that exert pro-proliferative and/or cytoprotective activity. Analysis of a library of synthetic peptides to identify those with antibacterial potential revealed that the most potent agent against multidrug-resistant S. aureus was a conjugate of a temporin analogue with the synthetic Leu-enkephalin analogue dalargin (DAL). DAL-PEG-DK5 exerted direct bactericidal effects via bacterial membrane disruption, leading to eradication of both planktonic and biofilm-associated staphylococci. Finally, we showed that accumulation of the peptide in the cytoplasm of human keratinocytes led to a marked clearance of intracellular MRSA, resulting in cytoprotection against invading bacteria. Collectively, the data showed that DAL-PEG-DK5 might be a potent antimicrobial agent for treatment of staphylococcal skin infections.
Collapse
|
16
|
Połeć K, Barnaś B, Kowalska M, Dymek M, Rachwalik R, Sikora E, Biela A, Kobiałka M, Wójcik K, Hąc-Wydro K. The influence of the essential oil extracted from hops on monolayers and bilayers imitating plant pathogen bacteria membranes. Colloids Surf B Biointerfaces 2018; 173:672-680. [PMID: 30384263 DOI: 10.1016/j.colsurfb.2018.10.047] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2018] [Revised: 10/15/2018] [Accepted: 10/17/2018] [Indexed: 01/01/2023]
Abstract
Many plant-derived compounds possess antimicrobial, antioxidant and even anticancer activities. Therefore, they are considered as substances that can be used instead of synthetic compounds in various applications. In this work, the essential oil from hop cones was extracted and analyzed, and then its effects on model bacteria membranes were studied to verify whether the hop essential oils could be used as ecological pesticides. The experiments involved surface pressure-area measurements, penetration studies and Brewster angle microscopy (BAM) imaging of lipid monolayers as well as hydrodynamic diameter, zeta potential, steady-state fluorescence anisotropy and Cryo-Transmission Electron Microscopy (cryo-TEM) measurements of liposomes. Finally the bactericidal tests on plant pathogen bacteria Pseudomonas syringae pv. lachrymans PCM 1410 were performed. The obtained results showed that the components of the essential oils from hop cones incorporate into lipid monolayers and bilayers and alter their fluidity. However, the observed effect is determined by the system composition, its condensation and the oil concentration. Interestingly, at a given dose, the effect of the essential oil on membranes was found to stabilize. Moreover, BAM images proved that hop oil prevents the formation of a large fraction of a condensed phase at the interface. Both the studies on model membranes as well as the in vitro tests allow one to conclude that the hop essential oil could likely be considered as the candidate to be used in agriculture as a natural pesticide.
Collapse
|
17
|
Mach M, Węder K, Hąc-Wydro K, Flasiński M, Lewandowska-Łańcucka J, Wójcik K, Wydro P. Influence of Cationic Phosphatidylcholine Derivative on Monolayer and Bilayer Artificial Bacterial Membranes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:5097-5105. [PMID: 29653049 DOI: 10.1021/acs.langmuir.7b04262] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
An increasing number of bacterial infections and the rise in antibiotic resistance of a number of bacteria species forces one to search for new antibacterial compounds. The latter facts motivate the investigations presented herein and are aimed at studying the influence of a cationic lipid, 1-palmitoyl-2-oleoyl- sn-glycero-3-ethylphosphocholine (EPOPC), on model (mono- and bilayer) membranes. The monolayer experiments involved the analysis of the interactions of EPOPC with bacterial membrane lipids in one component and mixed systems as well as Brewster angle microcopy studies. The properties of liposomes were analyzed based on the results of dynamic light scattering (DLS) and zeta potential measurements as well as on the experiments concerning the release of calcein entrapped in liposomes after titration with surfactant solution and steady-state fluorescence anisotropy of DPH. The obtained results evidenced that EPOPC, even at low concentrations, strongly changes organization of model systems making them less condensed. Moreover, EPOPC decreases the hydrodynamic diameter of liposomes, increases their zeta potential, and destabilizes model membranes, increasing their fluidity and permeability. Also, the in vitro tests performed on Escherichia coli (Gram-negative) and Staphylococcus aureus (Gram-positive) strains prove that EPOPC has some bacteriostatic properties which seem to be stronger toward Gram-negative than Gram-positive bacteria. All these findings allow one to conclude that EPOPC mode of action may be directly connected with the interactions of EPOPC molecules with bacterial membranes.
Collapse
|
18
|
Curzytek K, Kubera M, Trojan E, Wójcik K, Basta-Kaim A, Detka J, Maes M, Rygula R. The effects of pessimism on cell-mediated immunity in rats. Prog Neuropsychopharmacol Biol Psychiatry 2018; 80:295-303. [PMID: 28595946 DOI: 10.1016/j.pnpbp.2017.04.034] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/25/2017] [Accepted: 04/01/2017] [Indexed: 10/19/2022]
Abstract
We used a recently developed ambiguous-cue interpretation (ACI) paradigm to investigate whether 'optimism' and 'pessimism' as behavioural traits may be interrelated with immune functions in rodents. To this aim, in a series of ACI tests (cognitive bias screening, CBS), we identified rats that displayed 'pessimistic' and 'optimistic' traits. We found significant differences in immune biomarkers between 'optimistic' and 'pessimistic' animals. Moreover 'pessimism' was associated with significantly lower relative weight of the spleen and thymus, significantly decreased proliferative activity of splenocytes. Pessimism was associated with an increased production of interleukin-(IL)1β and IL-4, activin A, l-selectin, interferon (IFN)-γ and some chemokines and receptors for advanced glycation endproducts. The findings indicate an inflammatory profile in "pessimistic" animals.
Collapse
|
19
|
Mastalerz L, Celejewska-Wójcik N, Wójcik K, Gielicz A, Ćmiel A, Ignacak M, Oleś K, Szczeklik A, Sanak M. Induced sputum supernatant bioactive lipid mediators can identify subtypes of asthma. Clin Exp Allergy 2016; 45:1779-89. [PMID: 26449970 DOI: 10.1111/cea.12654] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2015] [Revised: 09/20/2015] [Accepted: 09/22/2015] [Indexed: 12/13/2022]
Abstract
BACKGROUND Induced sputum (IS) allows to measure mediators of asthmatic inflammation in bronchial secretions. The specific role of induced sputum supernatant (ISS) endogenous bioactive lipid mediators in subtypes of asthma is not well understood. OBJECTIVE To investigate the interactions between airway inflammation and clinical phenotypes of asthma, we integrated induced sputum supernatant (ISS) eicosanoids and quantitative assessment of infiltrating cells into new subtypes with the means of latent class analysis (LCA). METHODS One hundred and thirty-nine asthmatics with and without aspirin hypersensitivity underwent sputum induction. High-performance liquid chromatography or gas chromatography coupled with mass spectrometry was used to profile eicosanoids. Nineteen variables covering clinical characteristics, IS inflammatory cells and eicosanoids were considered in the LCA. RESULTS Four phenotypic asthma classes were distinguished. Class 1 with mild-to-moderate asthma, chronic rhinosinusitis (CRS), high PGA2 in ISS and almost equal distribution of inflammation cell patterns. Class 3 subjects also had mild-to-moderate asthma but without upper airway symptoms. Induced sputum was often paucigranulocytic with low levels of lipid mediators. Classes 2 and 4 represented severe asthma with CRS and impaired lung function despite high doses of steroids. High blood and sputum eosinophilia was in line with high cysteinyl leukotrienes and PGD2 in ISS only in class 2. Class 4 subjects tended to have increased sputum neutrophilia and PGE2 in ISS. Aspirin hypersensitivity was most frequent among class 2 subjects. CONCLUSIONS & CLINICAL RELEVANCE The LCA revealed four distinct asthma classes differing in eicosanoid pathways.
Collapse
|
20
|
Mastalerz L, Celejewska-Wójcik N, Wójcik K, Gielicz A, Januszek R, Cholewa A, Stręk P, Sanak M. Induced sputum eicosanoids during aspirin bronchial challenge of asthmatic patients with aspirin hypersensitivity. Allergy 2014; 69:1550-9. [PMID: 25123806 DOI: 10.1111/all.12512] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/11/2014] [Indexed: 01/06/2023]
Abstract
BACKGROUND Altered metabolism of eicosanoids is a characteristic finding in aspirin-exacerbated respiratory disease (AERD). Bronchial challenge with lysyl-aspirin can be used as a confirmatory diagnostic test for this clinical condition. Induced sputum allows to measure mediators of asthmatic inflammation in bronchial secretions. OBJECTIVES To investigate the influence of inhaled lysyl-aspirin on sputum supernatant concentration of eicosanoids during the bronchial challenge test. Subjects with asthma hypersensitive to nonsteroidal anti-inflammatory drugs were compared with aspirin-tolerant asthmatic controls. METHODS Induced sputum was collected before and following bronchial challenge with lysyl-aspirin. Sputum differential cell count and sputum supernatant concentrations of selected lipoxygenases products: 5-,12-,15-hydroxyeicosatetraenoic acid, cysteinyl leukotrienes, leukotriene B4 , 11-dehydro-thromboxane B2 , and prostaglandins E2 , D2 , and F2α and their metabolites, were measured using validated methods of chromatography-mass spectrometry. RESULTS Aspirin precipitated bronchoconstriction in all AERD subjects, but in none of the aspirin-tolerant asthmatics. Phenotypes of asthma based on the sputum cytology did not differ between the groups. Baseline sputum eosinophilia correlated with a higher leukotriene D4 (LTD4 ) and leukotriene E4 (LTE4 ) concentrations. LTC4 , PGE2 , and 11-dehydro-TXB2 did not differ between the groups, but levels of LTD4 , LTE4 , and PGD2 were significantly higher in AERD group. Following the challenge, LTD4 and LTE4 increased, while PGE2 and LTB4 decreased in AERD subjects only. CONCLUSIONS During the bronchial challenge, decrease in PGE2 and its metabolite is accompanied by a surge in bronchoconstrictory cysteinyl leukotrienes produced at the expense of LTB4 in AERD subjects. Bronchial PGE2 inhibition in AERD seems specific and sensitive to a low dose of aspirin.
Collapse
|
21
|
Wytrwal M, Koczurkiewicz P, Wójcik K, Michalik M, Kozik B, Żylewski M, Nowakowska M, Kepczynski M. Synthesis of strong polycations with improved biological properties. J Biomed Mater Res A 2013; 102:721-31. [DOI: 10.1002/jbm.a.34744] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2013] [Revised: 03/09/2013] [Accepted: 03/28/2013] [Indexed: 01/20/2023]
|
22
|
Bulwan M, Wójcik K, Zapotoczny S, Nowakowska M. Chitosan-based ultrathin films as antifouling, anticoagulant and antibacterial protective coatings. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2012; 23:1963-80. [PMID: 21967904 DOI: 10.1163/092050611x601711] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Ultrathin antifouling and antibacterial protective nanocoatings were prepared from ionic derivatives of chitosan using layer-by-layer deposition methodology. The surfaces of silicon, and glass protected by these nanocoatings were resistant to non-specific adsorption of proteins disregarding their net charges at physiological conditions (positively charged TGF-β1 growth factor and negatively charged bovine serum albumin) as well as human plasma components. The coatings also preserved surfaces from the formation of bacterial (Staphylococcus aureus) biofilm as shown using microscopic studies (SEM, AFM) and the MTT viability test. Moreover, the chitosan-based films adsorbed onto glass surface demonstrated the anticoagulant activity towards the human blood. The antifouling and antibacterial actions of the coatings were correlated with their physicochemical properties. The studied biologically relevant properties were also found to be dependent on the thickness of those nanocoatings. These materials are promising for biomedical applications, e.g., as protective coatings for medical devices, anticoagulant coatings and protective layers in membranes.
Collapse
|
23
|
Szostek S, Zawilińska B, Klimek M, Wójcik K, Koprynia M, Kosz-Vnenchak M. [Differentiation of an integrated and episomal HPV-16 DNA using real-time PCR in cervical specimens of women diagnosed with intraepithelial lesions and invasive cervical cancer]. Ginekol Pol 2011; 82:441-445. [PMID: 21853934] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023] Open
Abstract
UNLABELLED Persistent high-risk HPV infection, especially HPV-16, is considered to be an important step in the process of cervical carcinogenesis. Integration of viral DNA into the host genome through the destruction of HPV E2 sequences, increases the expression of viral proteins E6 and E7 and their participation in the transformation of cervical cancer. OBJECTIVE The aim of this study was to apply real-time PCR (RT-PCR) to assess the prevalence of integrated and episomal HPV-16 DNA and determine viral DNA load in women with cervical intraepithelial lesions and invasive cervical cancer MATERIAL AND METHODS A total of 84 women infected with HPV-16, including 44 with LSIL, 7 with HSIL and 33 with invasive cervical cancer participated in the study Cervical specimens were collected using the cytobrush. The presence of a sequence of E2 and E6 HPV-16 and human gene RNasy P was detected by quantitative RT-PCR. The viral load presented as the form of the virus genome copy numbers per 1,000 cells. RESULTS The integrated form of HPV-16 genome was found in 97% of women with cervical cancer. In women with LSIL and HSIL mixed form (simultaneous occurrence of an integrated and episomal form) of the viral genome (84% and 57%, respectively) prevailed. The frequency of the integrated HPV-16 DNA increased with progression of dysplastic lesions of the cervix (p<0.001). Statistically significant differences in average number of copies of the virus in women with LSIL and HSIL compared to patients with cancer (p<0.001) were observed. The highest viral load was detected in women demonstrating an integrated HPV-16 DNA. CONCLUSIONS Quantitative analysis of the sequence of E2 and E6 HPV-16 tested by RT-PCR can be used to determine the degree of integration of the viral genome and quantitative evaluation of viral load in clinical material. It can also serve as an additional parameter defining risk of progression of transformation in the cervix.
Collapse
|
24
|
Sangwal K, Wójcik K. Investigation of metastable zone width of ammonium oxalate aqueous solutions. CRYSTAL RESEARCH AND TECHNOLOGY 2009. [DOI: 10.1002/crat.200800545] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
25
|
Kwieciński J, Eick S, Wójcik K. Effects of tea tree (Melaleuca alternifolia) oil on Staphylococcus aureus in biofilms and stationary growth phase. Int J Antimicrob Agents 2008; 33:343-7. [PMID: 19095413 DOI: 10.1016/j.ijantimicag.2008.08.028] [Citation(s) in RCA: 112] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2008] [Revised: 08/22/2008] [Accepted: 08/22/2008] [Indexed: 11/26/2022]
Abstract
Tea tree oil (TTO) is known for its antimicrobial activity. In this study, we determined whether TTO is effective against Staphylococcus aureus in biofilms and how TTO activity is affected by the S. aureus growth phase. All clinical strains tested were killed by TTO both as planktonic cells and as biofilms. The minimum biofilm eradication concentration was usually two times higher than the minimum bactericidal concentration, yet it was never higher than 1% v/v. The fastest killing of biofilm occurred during the first 15min of contact with TTO and was not influenced by increasing TTO concentration above 1% v/v. Planktonic stationary phase cells exhibited decreased susceptibility to TTO compared with exponential phase cells. The killing rate for stationary phase cells was also less affected by increasing TTO concentration than that for exponential phase cells. These data show that TTO efficiently kills S. aureus in the stationary growth phase and within biofilms and is therefore a promising tool for S. aureus eradication.
Collapse
|