• Archives of Pharmacal Research
• /
• v.25 no.4
• /
• pp.546-549
• /
• 2002

The impact of storage conditions on the permeability of porcine buccal mucosa to [$^3H$]water and [$^{14}C$]mannitol was assessed. The fresh pocine buccal tissue (fresh tissue) was obtained by utilizing pig heads within 24 hours of slaughter. The stored and frozen porcine buccal tissues (stored tissue and frozen tissue) were obtained after the storage of the tissue intact in the pig heads at $4^{\circ}C$ or -$20^{\circ}C$, respectively, for 24 h. The results demonstrated that the barrier properties of the porcine buccal mucosa were maintained with regard to [$^3H$]water permeability when stored at $4^{\circ}C$ for 24 h. However, freezing the tissue resulted in tissue damage illustrated by a significant increase in [$^3$H]water permeability. [$^{14}C$]Mannitol does not appear to be a suitable model solute to assess the ex vivo permeability of porcine buccal mucosa due to its extremely low permeability.

• Anatomy and Cell Biology
• /
• v.56 no.4
• /
• pp.538-551
• /
• 2023

Exposure to environmental pollutants such as carbon tetrachloride (CCL₄) causes liver damage. This study aimed to compare the ameliorative activity of the dates flesh extract (DFE) and selenium-nanoparticles (SeNPs) on CCL₄-induced hepatotoxicity and if DFE could be a useful alternative supplement. Twenty-four male albino rats were enrolled and randomly divided into four equal groups (6 rats in each group): control group received only basal diet with no medications. Group II received CCL₄ in a dose of 0.5 mg/kg intraperitoneal injection twice weekly for four weeks. Group III rats were pretreated with SeNPs in a dose of 2.5 mg/kg once a day orally three times/wk for four weeks alone then combined with the previously described dose of CCL₄ for another four weeks. Group IV rats were pretreated with DFE in a dose of 8 ml of the aqueous extract/kg/d orally for four weeks alone then combined with the previously described dose of CCL₄ for another four weeks. The liver damage was assessed by estimation of plasma concentration of albumin and enzymes activities of alanine aminotransferase and tissue genes expression. Liver oxidation levels were assessed by measuring the tissue concentration of the malondialdehyde, superoxide dismutase, and the total glutathione. Additionally, inflammatory mediators tumour necrosis factor--α and interleukin-6 were estimated. Detecting the liver's cellular structural damage was done by histopathological and immunohistochemical examination. This study suggests that CCL₄-induced liver damage in rats can be protected by administration whether the costly SeNPs or the economical DFE.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
• /
• v.36 no.1
• /
• pp.43-52
• /
• 2010

Purpose: To research about maxillofacial traumatic injuries of children in aspects of gender difference, various incidence rates between age, trauma type, cause, monthly and daily incidence rate, type of tooth damage, gingival damage, soft tissue damage, and type of facial bone fracture. Materials and methods: Study group consisted of children under 15 years of age who visited Dental Hospital, School of Dentistry, Kyung Hee University from 2004/7/1 to 2007/6/30 with chief complaint of oral and maxillofacial traumatic injuries. 1,559 cases of traumatic injuries were studied from 1,556 (1,004 male, 552 female) children. Conclusion: 1. There were slightly more boys than girls, giving a male-to-female ratio of 1.82:1.0. The 1-3 year old boys and girls had the highest number of traumatic injuries. 2. Of the 1,556 patients, 68.63% had soft tissue injuries, 50.22% had periodontal injuries, 29.89% had teeth injuries, and 3.85% had maxillofacial bone fractures. 3. Falling down was the most common cause of injury in both sexes. 4. The months with the highest incidence rates were in order May (12.12%), June (11.74%), and October (11.13%). Most of the injuries occurred on weekends. 5. The most common tooth injury was uncomplicated crown fracture, and the most common periodontal injury was subluxation. The majority of traumatizes teeth were the upper central incisors. 6. The most common soft tissue injury was intraoral lacerations. 7. Mandibular fractures were most frequent in facial bone fractures; symphysis, condylar head, and angle fractures were most frequent in mandibular fractures; maxillary and nasal bone fractures were most frequent in midfacial bone fractures.

• Archives of Plastic Surgery
• /
• v.44 no.4
• /
• pp.261-265
• /
• 2017

Periauricular paresthesia may afflict patients for a significant amount of time after facelift surgery. When performing face and neck lift surgery, temple and posterior auricular flap dissection is undertaken directly over the auriculotemporal, great auricular, and lesser occipital nerve territory, leading to potential damage to the nerve. The auriculotemporal nerve remains under the thin outer superficial fascia just below the subfollicular level in the prehelical area. To prevent damage to the auriculotemporal nerve and to protect the temporal hair follicle, the dissection plane should be kept just above the thin fascia covering the auriculotemporal nerve. Around the McKinney point, the adipose tissue covering the deep fascia is apt to be elevated from the deep fascia due to its denser fascial relationship with the skin, which leaves the great auricular nerve open to exposure. In order to prevent damage to the posterior branches of the great auricular nerve, the skin flap at the posterior auricular sulcus should be elevated above the auricularis posterior muscle. Fixating the superficial muscular aponeurotic system flap deeper and higher to the tympano-parotid fascia is recommended in order to avoid compromising the lobular branch of the great auricular nerve. The lesser occipital nerve (C2, C3) travels superficially at a proximal and variable level that makes it vulnerable to compromise in the mastoid dissection. Leaving the adipose tissue at the level of the deep fascia puts the branches of the great auricular nerve and lesser occipital nerve at less risk, and has been confirmed not to compromise either tissue perfusion or hair follicles.

• Archives of Pharmacal Research
• /
• v.21 no.5
• /
• pp.531-536
• /
• 1998

We had previously reported that the protective effect of taurine against indomethacin-induced gastric mucosal injury was due to its antioxidant effects, which inhibited lipid peroxidation and neutrophil activation. In this study, we examined the effect of taurine on reducing the inflammatory parameters of trintrobenzene sulfonic acid (TNBS)-induced inflammatory bowel disease (IBD) in rats. In order to induce IBD, ethanolic TNBS was given to rats intracolonically. Then they received 500 mg/kg.day of taurine orally and were sacrificed one week after IBD induction. While ulceration and inflammation of distal colon with formation of granuloma in the vehicle-treated IBD rats two days after administration of TNBS were observed, treatment with taurine ameliorated colonic damage and decreased the incidence of diarrhea and adhesion. also, colon weight as an index of tissue edema, which was mardedly increased in the IBD rats, became significantly lower after administration of TNBS were observed, treatment with taurine ameliorated colonic damage and decreased the incidence of diarrhea and adhesion. Also colon weitht as an index of tissue edema, which was markedly increased in the IBD rats, became significantly lower after taruine treatment. Myeloperoxidase (MPO) activity in the vehicle-treated IBD rats was substantially increased, compared with that of normal control. the taurine-treated animals significantly reduced MPO activity (35% lower) when compared with that of the vehicle-treated animals. Taurine treatment decreased both basal and formyl-methionyl leucyl phenylalanine-stimulated reactive oxygen generation from colonic tissue in the IBD rats. These results suggest that the administration of taurine reduce the inflammatory parameters in this IBD rat model by increasing defending capacity against oxidative damage.

• Journal of Society of Preventive Korean Medicine
• /
• v.12 no.3
• /
• pp.81-90
• /
• 2008

Objectives : The pathophysiology of ICH is not fully understood, therefore, the fundamental therapeutic strategies for ICH also not well inspected either. The genetic profile for the effect of Carthami Flos extract on cerebral hemorrhage in rat brain tissue was measured using microarray technique. Genes displaying expressional change on brain damage were selected and the functional analysis on these genes was conducted. Methods : Rats were placed in a stereotaxic frame after intraperitoneal injection of chloralhydrate, and ICH was induced by injection of collagenase type IV and Carthami Flos extract was administered orally. The molecular profile of cerebral hemorrhage in rat brain tissue was measured using microarray technique to identify up- or down- regulated genes in brain tissue. Results : Upon treatment with Carthami Flos extract on the rat having brain damage, many genes show expressional change. The pattern of gene expressional change can be classified into 8 classes in which two types of classes were composed of recovered genes from up or down-regulation by brain damage, respectively. Conclusions : Further analysis using protein interaction database identified some key molecules that can be used for elucidation of therapeutical mechanism of Carthami Flos extract in future.

• Journal of the Korean Physical Society
• /
• v.73 no.9
• /
• pp.1289-1294
• /
• 2018

The present study aims to investigate experimentally and theoretically thermal ablation in soft tissues by using high intensity focused ultrasound (HIFU) to assess tissue damage during HIFU thermotherapy. The HIFU field was calculated by solving the axisymmetric Khokhlov-Zabolotskaya-Kuznetsov equation from the frequency-domain perspective. The temperature field was calculated by solving Pennes' bioheat transfer equation, and the thermal dose required to create a thermal lesion was calculated by using the thermal dose formula based on the thermal dose of a 240-min exposure at $43^{\circ}C$. In order to validate the simulation results, we performed thermal ablation experiments in a tissue-mimicking phantom and ex-vivo porcine liver for two different HIFU source conditions by using a 1.1-MHz, single-element, spherically focused HIFU transducer. The small difference between the measured and the predicted lesion sizes suggests that the implementation of the numerical model used here should be modified to iteratively allow for temperature-dependent changes in the physical properties of tissues.

• The Korean Journal of Pain
• /
• v.34 no.1
• /
• pp.132-136
• /
• 2021

Local anesthetic (LA) injection outside the sheath in epineural or paraneural connective tissue is considered safe practice among regional anesthesiologists. There is limited evidence as to whether neurological complications occur if LA is injected inside the sheath (subepineural - intraneural). We performed ultrasound guided injections at the level of undivided sciatic nerve in four amputated lower limbs. In two specimens, LA was injected in epineural connective tissue (paraneural tissue) and in another two specimens by penetrating the outer nerve sheath (hyperechoic epineurium). Ultrasonography demonstrated an increase in the size of nerve and macroscopic findings revealed fascicular tracings with sub-epineural injections. Limbs were sent for histological analysis in formalin containers. Pathologist performed the analysis which demonstrated an intact perineurium and a breach in the epineurium. We conclude that sub-epineural injections are unsafe and injection should be done in paraneural tissue to ensure safety and avoid unwanted neurological sequelae after the block.

• Radiation Oncology Journal
• /
• v.18 no.3
• /
• pp.205-213
• /
• 2000

Purpose : To determine the role of cytokines in the apoptosis of rat's liver following irradiation. Materials and Methods : Sprague-Dawley rats were irradiated to entire body with a single dose of 8 Gy. The rats were divided Into 5 groups according to the sacrlfice day after irradiation. The liver and blood after 1, 3, 5, 7, and 14 days irradiation were sampled for evaluation of mechanism of apoptosis and role of cytokine in relation to radiation-induced tissue damage. The study was composed of microscopic evaluation of liver tissue, in situ detection method for apoptosis, immunohistochemical stain of IL-1, IL-4, IL-6 and TNF, bioassay and radioimmunoassay of IL-6 in liver tissue and blood. Results : Radiation-induced liver damage was noted from first day of radiation, and most severe parenchymal damage associated with infiltration of chronic inflammatory cells was seen in the groups of 5 days after radiation. A number of apoptosis were observed 1 day after radiation on both light microscope and in situ method. Afterwards, the number of apoptosis was gradually diminished. On immunohistochemical study, IL-1 and TNF were expressed 1, 3 days after radiation, but not expressed after that. IL-4 was not expressed in the entire groups. IL-6 was expressed with strong positivity in 1, 3 days after radiation. Bioassay and RIA of IL-6 in liver tissue and blood showed the highest value in 1 day after radiation, and the value is diminished after then. Conclusion. Apoptosis seemed to be the important mechanism of radiation-induced liver damage, and is possibly induced by the release of cytokines, such as IL-1, IL-6, TNF in view the simultaneously increased appearance of pooptosis and cytokines.

• Journal of Microbiology and Biotechnology
• /
• v.32 no.2
• /
• pp.238-247
• /
• 2022

Since the skin covers most surfaces of the body, it is susceptible to damage, which can be fatal depending on the degree of injury to the skin because it defends against external attack and protects internal structures. Various types of artificial skin are being studied for transplantation to repair damaged skin, and recently, the production of replaceable skin using three-dimensional (3D) bioprinting technology has also been investigated. In this study, skin tissue was produced using a 3D bioprinter with human skin cell lines and cells extracted from mouse skin, and the printing conditions were optimized. Gelatin was used as a bioink, and fibrinogen and alginate were used for tissue hardening after printing. Printed skin tissue maintained a survival rate of 90% or more when cultured for 14 days. Culture conditions were established using 8 mM calcium chloride treatment and the skin tissue was exposed to air to optimize epidermal cell differentiation. The skin tissue was cultured for 14 days after differentiation induction by this optimized culture method, and immunofluorescent staining was performed using epidermal cell differentiation markers to investigate whether the epidermal cells had differentiated. After differentiation, loricrin, which is normally found in terminally differentiated epidermal cells, was observed in the cells at the tip of the epidermal layer, and cytokeratin 14 was expressed in the lower cells of the epidermis layer. Collectively, this study may provide optimized conditions for bioprinting and keratinization for three-dimensional skin production.