scholarly journals A nano phototheranostic approach of toluidine blue conjugated gold silver core shells mediated photodynamic therapy to treat diabetic foot ulcer

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Farheen Akhtar ◽  
Asad U. Khan ◽  
Bushra Qazi ◽  
Senthilguru Kulanthaivel ◽  
Prashant Mishra ◽  
...  

AbstractDiabetic foot infection caused by multidrug-resistant bacteria, is becoming serious problem. Moreover, polymicrobial biofilms contribute significantly to the persistent infections. In the present study, we investigated the effectiveness of novel toluidine blue conjugated chitosan coated gold–silver core–shell nanoparticles (TBO–chit–Au–AgNPs) mediated photodynamic therapy and demonstrate their use as a nontoxic antibacterial therapy to combat diabetic foot ulcer (DFU) caused by multi-drug resistant strains both in monomicrobial and polymicrobial state of infection. In vitro efficacy of TBO–chit–Au–AgNPs mediated photodynamic therapy (PDT) against polymicrobial biofilms was determined using standard plate count method and compared with that of monomicrobial biofilms of each species. Different anti-biofilm assays and microscopic studies were performed to check the efficacy of TBO–chit–Au–AgNPs mediated PDT, displayed significant decrease in the formation of biofilm. Finally, its therapeutic potential was validated in vivo type-2DFU. Cytokines level was found reduced, using nano-phototheranostic approach, indicating infection control. Expression profile of growth factors confirmed both the pathogenesis and healing of DFU. Hence, we conclude that TBO–chit–Au–AgNPs mediated PDT is a promising anti-bacterial therapeutic approach which leads to a synergistic healing of DFU caused by MDR bacterial strains.

2015 ◽  
Vol 141 (3) ◽  
pp. 340 ◽  
Author(s):  
RenatoM Neto ◽  
RenataA Gama ◽  
MariliaA.R.Q. Pinheiro ◽  
JuliannyB Ferraz ◽  
MiguelA.A. Junior ◽  
...  

2021 ◽  
Vol 11 (15) ◽  
pp. 6847
Author(s):  
Ahdab N. Khayyat ◽  
Hisham A. Abbas ◽  
Mamdouh F. A. Mohamed ◽  
Hani Z. Asfour ◽  
Maan T. Khayat ◽  
...  

Diabetic foot ulcers are recognized to be a severe complication of diabetes, increasing the risk of amputation and death. The bacterial infection of Diabetic foot ulcers with virulent and resistant bacteria as Proteus mirabilis greatly worsens the wound and may not be treated with conventional therapeutics. Developing new approaches to target bacterial virulence can be helpful to conquer such infections. In the current work, we evaluated the anti-virulence activities of the widely used antibacterial metronidazole. The minimum inhibitory concentrations (MIC) and minimum biofilm eradication concentrations (MEBC) were determined for selected antibiotics which P. mirabilis was resistant to them in the presence and absence of metronidazole in sub-MIC. The effect of metronidazole in sub-MIC on P. mirabilis virulence factors as production of exoenzymes, motilities, adhesion and biofilm formation, were evaluated. Furthermore, molecular docking of metronidazole into P. mirabilis adhesion and essential quorum sensing (QS) proteins, was performed. The results revealed a significant ability of metronidazole to in-vitro inhibit P. mirabilis virulence factors and antagonize its essential proteins. Moreover, metronidazole markedly decreased the MICs and MBECs of tested antibiotics. Conclusively, metronidazole in sub-MIC is a plausible anti-virulence and anti-QS agent that can be combined to other antibiotics as anti-virulence adjuvant to defeat aggressive infections.


2015 ◽  
Vol 2015 ◽  
pp. 1-19 ◽  
Author(s):  
Ka-Kit Tsang ◽  
Enid Wai-Yung Kwong ◽  
Kevin Y. Woo ◽  
Tony Shing-Shun To ◽  
Joanne Wai-Yee Chung ◽  
...  

Honey and silver have been used since ancient times for treating wounds. Their widespread clinical application has attracted attention in light of the increasing prevalence of antibiotic-resistant bacteria. While there have been a number of studies exploring the anti-inflammatory and antibacterial effects of manuka honey and nanocrystalline silver, their advantages and limitations with regard to the treatment of chronic wounds remain a subject of debate. The aim of this paper is to examine the evidence on the use of nanocrystalline silver and manuka honey for treating diabetic foot ulcers through a critical and comprehensive review of in vitro studies, animal studies, and in vivo studies. The findings from the in vitro and animal studies suggest that both agents have effective antibacterial actions. Their anti-inflammatory action and related impact on wound healing are unclear. Besides, there is no evidence to suggest that any topical agent is more effective for use in treating diabetic foot ulcer. Overall, high-quality, clinical human studies supported by findings from the molecular science on the use of manuka honey or nanocrystalline silver are lacking. There is a need for rigorously designed human clinical studies on the subject to fill this knowledge gap and guide clinical practice.


2021 ◽  
Vol Volume 13 ◽  
pp. 135-144
Author(s):  
Valentina Lorenzoni ◽  
Agatina Chiavetta ◽  
Vincenzo Curci ◽  
Giuseppe Della Pepa ◽  
Carmelo Licciardello ◽  
...  

Author(s):  
Dr. Devi Das Verma ◽  
Dr. Anil Kumar Saxena

Introduction:  Diabetes is one of the most prevalent metabolic chronic diseases due to the imbalance production of insulin. One of the studies reported that in 2010 worldwide 285 million adults had diabetes and this figure may be increase to 439 million by the year 2030. Globally Diabetic foot ulcers (DFUs) constitute major health problem in people that significantly contribute to morbidity and mortality in diabetes patients. Approximate 1.0% to 4.1% of the annual population-based incidences of a diabetic foot ulcer (DFU) were reported. Due to this the lifetime may be as high as 25%. In Asian countries diabetic foot ulcer are major problems which are different from European countries or developing countries.  From many studies reported diabetic foot problems in India are infectious and neuropathic in nature as compared to developed countries. According to World Health Organization (WHO) diabetic foot is defined as lower limb of a diabetic patient characterized by infection, potential risk of pathologic consequences ulceration or destruction of deep tissues associated with neurological abnormalities, various changes in peripheral neuropathy vasculopathy and superimposed infection that are mainly responsible foot ulceration. Ulcers are one kind of abscess which is difficult to treat because of poor wound healing that result from a combination of neuropathy, ischemia and hyperglycemia.  Aim: The main objective was to study the outcome of treatment modalities and it’s relating factors to complication in diabetic foot ulcer.  Material and method:  Total 60 diabetic foot ulcer patients with the age range from 20 to 70 years were included.  From all the patients’ detailed past and present history were recorded.  For all the patients, general, physical and local and systemic examinations were also done. Detail   laboratory examination like Fasting and Post Prandial Blood sugar levels, blood count, ECG, ESR, complete urine examination for the presence of ketone bodies and sugar, x-ray as well as culture and sensitivity of the discharge from ulcer were also done. Patients were treated with various treatment methods like conservative treatment, split skin grafting and amputation. Result: In this study male patients were more in proportion as compared to female. This study showed that maximum with the age group 14 -50 (43.3%) years old followed by 18.3% in 31-40 years old, 16.7% in 61-70 years old.  6.7% showed the least age group as 20 -30 years old.  Out of total 60 patients, 38.3% of the patients showed diabetic ulcer foot which was more whereas 15% showed diabetic gangrene foot which was least. 25% showed diabetic cellulites foot and 21.7% showed as diabetic abscess foot.  Conclusion: Globally as diabetes mellitus cases are increasing and it became rapidly the public health problem. This may be due to burden on economy, health system and on society to manage the diabetic foot problems. Diabetic foot management guidelines must be made into our practice protocols which may preventing limb loss, and decrease mortality and increase the quality of life of the patient. Hence for this it is only possible with the help of foot care education and health care workers.  Hence, foot infection is to put first and care for it like hands. Keywords: Diabetes, foot ulcers, infections, amputations.


2015 ◽  
Author(s):  
Fakhraddeen Muhammad ◽  
Lateefah Pedro ◽  
Hassan Suleiman ◽  
Enikuomehin Adenike ◽  
Rahila Mukhtar ◽  
...  

2019 ◽  
Author(s):  
Maksym Prystupiuk ◽  
Iuliia Onofriichuk ◽  
Lev Prystupiuk ◽  
Ludmila Naumova ◽  
Marianna Naumova

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