CRISTINA PIRES CAMARGO
Projetos de Pesquisa
Unidades Organizacionais
Instituto Central, Hospital das Clínicas, Faculdade de Medicina
LIM/04 - Laboratório de Microcirurgia, Hospital das Clínicas, Faculdade de Medicina
LIM/04 - Laboratório de Microcirurgia, Hospital das Clínicas, Faculdade de Medicina
8 resultados
Resultados de Busca
Agora exibindo 1 - 8 de 8
- Discussion: In Vivo Analysis of the Superficial and Deep Fascia(2022) CAMARGO, Cristina Pires
- Effect of Light Emitted by Diode as Treatment of Radiodermatitis(2022) CAMARGO, Cristina Pires; CARVALHO, H. A.; GEMPERLI, R.; TABUSE, Cindy Lie; SANTOS, Pedro Henrique Gianjoppe dos; GONCALES, Lara Andressa Ordonhe; REGO, Carolina Lopo; SILVA, B. M.; TEIXEIRA, M. H. A. S.; FEITOSA, Y. O.; VIDEIRA, F. H. P.; CAMPELLO, G. A.Radiotherapy can cause radiodermatitis in 85-90% in oncologic patients. There are several therapeutic alternatives to treat radiodermatitis with variable results. A new option is the use of light emitted-diode (LED) to treat this condition. We analyzed twenty male Wistar rats weighing 200-250 g. All the animals underwent a radiotherapy session. After 15 days, the animals were divided into four groups: control (no treatment) and LED 630 nm, 850 nm, 630 + 850 nm. The LED treatment was applied every two days until the 21 days). We analyzed the macroscopic aspect of radiodermatitis before and after treatment. After this phase, samples were collected for histological (HE). Macro and microscopic analysis indicated positive effects with exposure to light, especially with the association between wavelengths 630 and 850 nm, resulting in a reduction in the severity of radiodermatitis to grade 2-2.5. In the histological analysis, photobiomodulation increased the division and migration of cells in the basal layer of the epidermis, demonstrating the regenerative potential of this treatment in the effects of radiotherapy, increasing the speed of epithelialization of the lesion. This study suggested that the association of 630 + 850 nm improved radiodermatitis regeneration.
- Comparison of three different strategies to treat sciatic nerve regeneration: an experimental study(2022) SMANIOTTO, Pedro Henrique; CAMARGO, Cristina Pires; KUBRUSLY, Marcia Saldanha; GEMPERLI, RolfPurpose: To compare the effect of vein conduit filled with adipose tissue stem cells (ASC) on peripheral nerve injury regeneration. Methods: We analyzed 30 male Wistar rats surgically submitted to a 5-mm gap on the sciatic nerve. Then, the animals were divided into three groups: nerve autografting (AG, n=10), autogenous inverted glycerol-conserved vein (VG, n=10), and autogenous inverted glycerol-conserved vein + ASC (VASCG, n=10). The study endpoints were neuromotor functional analysis, gastrocnemius muscle weight, and sciatic nerve graft histomorphometry analysis. In the histologic analysis, we added a control group (naive nerve). Results: Regarding functional analysis (Walking tract- score), the findings at week 3 showed a difference between the AG and the VG (-96.6 vs. -59.6, p=0.01, respectively) and between the VG and the inverted vein + VASCG (-59.9 vs. -88.92, p=0.02). At week 12, this study showed a difference between the AG and the VG (-64.8 vs. -47.3, p=0.004, respectively), and also a difference between the VG and the VASCG (-47.3 vs. -57.4, p=0.02, respectively). There was no difference in the histomorphometry analysis (nerve diameter, Schwann cells counting). The gastrocnemius muscles on the intervention side were more atrophic when compared to the gastrocnemius muscles on the control side. Conclusion: Our results suggested better functional recovery in the inverted vein group when compared to control group, and inverted vein + ASC group.
conferenceObject CAN ASC SECRETOME-LOADED DECELLULARIZED EXTRACELLULAR MATRIX (ECM) HYDROGELS AUGMENT WOUND HEALING IN A SKIN FLAP?(2022) VRIEND, Linda; DONGEN, Joris A. van; CAMARGO, Cristina P.; LEI, Berend van der; HARMSEN, Martin C.- Paramedian forehead flap in the treatment of nasal, non-melanoma skin cancer: a cross-sectional study(2022) RIBEIRO, RENAN DIEGO AMÉRICO; PAGOTTO, VITOR PENTEADO FIGUEIREDO; TAKAHASHI, GIULIA GODOY; TUTIHASHI, RAFAEL MAMORU CARNEIRO; CAMARGO, CRISTINA PIRES; BUSNARDO, FABIO DE FREITAS; GEMPERLI, ROLFABSTRACT Introduction: nose is the central point of the face and vulnerable to the occurence of non-melanoma skin cancer (NMSC), impacting on appearance. The paramedian forehead flap (PMFF) is considered the best option to treat extensive nasal defects. The objective of this study is to present the experience on PMFF for nasal reconstruction in the treatment of NMSC of a cancer referral center. Methods: retrospective study was carried out through data from medical records of patients who underwent nasal reconstruction with PMFF due to NMSC at the Cancer Institute of the State of São Paulo (ICESP). Results: 111 patients were identified, mostly ederly, with comorbidities and on initial tumors (T1 and T2). Basal cell carcinoma (BCC) was the predominant histological type. Dorsum and tip were the most affected subunitis. In addition to skin coverage, reconstruction of the lining and structural framework was also performed in half of the cases. Second intention healing was the technique of choice in closing the donor area. Pedicle division ocurred predominantly in the second operation and the median time to complete reconstruction was 6 months. There were low complication rates. Conclusions: the PMFF is safe and effective to treat nose NMSC, even in cases of high complexity. Since the treatment time can be prolonged and impact on quality of life, it is essential to emphasize and discuss this aspect with the patients before surgery.
- Limited Efficacy of Adipose Stromal Cell Secretome-Loaded Skin-Derived Hydrogels to Augment Skin Flap Regeneration in Rats(2022) VRIEND, Linda; DONGEN, Joris A. van; SINKUNAS, Viktor; BROUWER, Linda A.; BUIKEMA, Henk J.; MOREIRA, Luiz F.; GEMPERLI, Rolf; BONGIOVANNI, Laura; BRUIN, Alain de; LEI, Berend van der; CAMARGO, Cristina P.; HARMSEN, Martin C.Insufficient vascularization is a recurring cause of impaired pedicled skin flap healing. The administration of adipose tissue-derived stromal cells' (ASCs') secretome is a novel approach to augment vascularization. Yet, the secretome comprised of soluble factors that require a sustained-release vehicle to increase residence time. We hypothesized that administration of a hydrogel derived from decellularized extracellular matrix (ECM) of porcine skin with bound trophic factors from ASCs enhances skin flap viability and wound repair in a rat model. Porcine skin was decellularized and pepsin-digested to form a hydrogel at 37 degrees C. Conditioned medium (CMe) of human ASC was collected, concentrated 20-fold, and mixed with the hydrogel. Sixty Wistar rats were included. A dorsal skin flap (caudal based) of 3 x 10 cm was elevated for topical application of DMEM (group I), a prehydrogel with or without ASC CMe (groups II and III), or ASC CMe (group IV). After 7, 14, and 28 days, perfusion was measured, and skin flaps were harvested for wound healing assessment and immunohistochemical analysis. Decellularized skin ECM hydrogel contained negligible amounts of DNA (11.6 +/- 0.6 ng/mg), was noncytotoxic and well tolerated by rats. Irrespective of ASC secretome, ECM hydrogel application resulted macroscopically and microscopically in similar dermal wound healing in terms of proliferation, immune response, and matrix remodeling as the control group. However, ASC CMe alone increased vessel density after 7 days. Porcine skin-derived ECM hydrogels loaded with ASC secretome are noncytotoxic but demand optimization to significantly augment wound healing of skin flaps.
- A modified hydrogel production protocol to decrease cellular content(2022) BRAGA, Gabriela Catao Diniz; CAMARGO, Cristina Pires; HARMSEN, Martin Conrad; CORREIA, Aristides Tadeu; SOUZA, Sonia; SEELAENDER, Marilia; NUNES, Viviane Araujo; SANTOS, Jeniffer Farias dos; NERI, Elida Adalgisa; VALADAO, Iuri Cordeiro; MOREIRA, Luiz Felipe Pinho; GEMPERLI, RolfPurpose: To analyze the cytotoxicity and cell in porcine-derived decellularized skin matrix. Methods: We analyzed the effect of multiple decellularization processes by histological analysis, DNA quantification, and flow cytometry. Subsequently, we analyzed the most appropriate hydrogel concentration to minimize cytotoxicity on fibroblast culture and to maximize cell proliferation. Results: After the fourth decellularization, the DNA quantification showed the lowest DNA concentration (< 50 ng/mg). Histological analysis showed no cell components in the hydrogel. Moreover, hematoxylin and eosin showed a heterogeneous structure of collagen fibers. The best hydrogel concentration ranged from 3 to 25%, and there was no significant difference between the 24 hours and seven days. Conclusion: The process of hydrogel production was effective for removing cells and DNA elements. The best hydrogel concentration ranged from 3 to 25%.
- Extracellular Matrix-Derived Hydrogels to Augment Dermal Wound Healing: A Systematic Review(2022) VRIEND, Linda; SINKUNAS, Viktor; CAMARGO, Cristina P.; LEI, Berend van der; HARMSEN, Martin C.; DONGEN, Joris A. vanChronic, non-healing, dermal wounds form a worldwide medical problem with limited and inadequate treatment options and high societal burden and costs. With the advent of regenerative therapies exploiting extracellular matrix (ECM) components, its efficacy to augment wound healing is to be explored. This systematic review was performed to assess and compare the current therapeutic efficacy of ECM hydrogels on dermal wound healing. The electronic databases of Embase, Medline Ovid, and Cochrane Central were searched for in vivo and clinical studies on the therapeutic effect of ECM-composed hydrogels on dermal wound healing (April 13, 2021). Two reviewers selected studies independently. Studies were assessed based on ECM content, ECM hydrogel composition, additives, and wound healing outcomes, such as wound size, angiogenesis, and complications. Of the 2102 publications, 9 rodent-based studies were included while clinical studies were not published at the time of the search. Procedures to decellularize tissue or cultured cells and subsequently generate hydrogels were highly variable and in demand of standardization. ECM hydrogels with or without additives reduced wound size and also seem to enhance angiogenesis. Serious complications were not reported. To date, preclinical studies preclude to draw firm conclusions on the efficacy and working mechanism of ECM-derived hydrogels on dermal wound healing. The use of ECM hydrogels can be considered safe. Standardization of decellularization protocols and implementation of quality and cytotoxicity controls will enable obtaining a generic and comparable ECM product. Impact statementExtracellular matrix (ECM)-based hydrogels are biocompatible and harbor growth factors that can instruct tissue healing. Their application is a novelty in (pre)clinical wound healing treatment. This systematic review provides an overview of the current evidence for ECM hydrogels in enhancing wound healing and an extensive overview of the decellularization procedures used. Lastly, challenges and future directions to standardize decellularization procedures and implement quality controls are proposed.