scholarly journals Role of Thickness of Collagen Fibers in Odontogenic Keratocyst and Dentigerous Cyst– A Picrosirius Red Polarized Microscopic Study

2017 ◽  
Author(s):  
Dr Swathi Jahagirdar ◽  
Keyword(s):  
Microscopic Study ◽  
Dentigerous Cyst ◽  
Collagen Fibers ◽  
Odontogenic Keratocyst ◽  
Picrosirius Red

scholarly journals Comparative Evaluation of Collagen Fibers in Odontogenic Keratocyst and Unicystic Ameloblastoma

2011 ◽  
Vol 2 (2) ◽  
pp. 125-127
Author(s):  
Vaidhehi N Nayak ◽  
Mandana Donoghue ◽  
M Selvamani
Keyword(s):  
Comparative Evaluation ◽  
Collagen Fibers ◽  
Odontogenic Keratocyst ◽  
Biological Behavior ◽  
Polarization Method ◽  
Polarizing Microscopy ◽  
Greenish Yellow ◽  
Unicystic Ameloblastoma ◽  
Red Dye ◽  
Picrosirius Red

ABSTRACT Background Odontogenic keratocyst (OKC) is an aggressive cyst with neoplastic behavior and unicystic ameloblastoma (UA) is a neoplasm with cyst like behavior. Both odontogenic keratocyst and unicystic ameloblastoma show biologic behavior unlike other lesions in their respective groups. In the present study, the biological behavior of these lesions were assessed by studying the collagen fibers in their walls using picrosirius red (PSR) polarization method. Methods Collagen fibers in 20 cases of OKC and 20 cases of UA were studied histologically by staining sections with picrosirius red dye and examining them by polarizing microscopy. Polarization colors of the collagen fibers of the lesions were recorded according to their width. Results While no differences were seen between the polarization colors of thin fibers (< 0.8 μ) in both odontogenic keratocyst and unicystic ameloblastoma, the polarization colors of thick fibers of odontogenic keratocyst were significantly more greenish-yellow as compared to the unicystic ameloblastoma which were predominantly yellowish-red. Conclusion These findings suggest that odontogenic keratocyst is a more aggressive lesion than unicystic ameloblastoma by means of identifying abnormally packed collagen fibers in odontogenic keratocyst but not in unicystic ameloblastoma. Thus, the nature of collagen fibers as studied by the picrosirius red polarization method may be useful as a diagnostic tool to differentiate between the two lesions.

scholarly journals Combination of histochemical analyses and micro-MRI reveals regional changes of the murine cervix in preparation for labor

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Antara Chatterjee ◽  
Rojan Saghian ◽  
Anna Dorogin ◽  
Lindsay S. Cahill ◽  
John G. Sled ◽  
...  
Keyword(s):  
Smooth Muscle ◽  
Smooth Muscle Cells ◽  
Diffusion Tensor ◽  
Ex Vivo ◽  
Muscle Cells ◽  
Pregnant Mouse ◽  
Collagen Fibers ◽  
Muscular Layer ◽  
Tissue Organization ◽  
Picrosirius Red

AbstractThe cervix is responsible for maintaining pregnancy, and its timely remodeling is essential for the proper delivery of a baby. Cervical insufficiency, or “weakness”, may lead to preterm birth, which causes infant morbidities and mortalities worldwide. We used a mouse model of pregnancy and term labor, to examine the cervical structure by histology (Masson Trichome and Picrosirius Red staining), immunohistochemistry (Hyaluronic Acid Binding Protein/HABP), and ex-vivo MRI (T2-weighted and diffusion tensor imaging), focusing on two regions of the cervix (i.e., endocervix and ectocervix). Our results show that mouse endocervix has a higher proportion of smooth muscle cells and collagen fibers per area, with more compact tissue structure, than the ectocervix. With advanced gestation, endocervical changes, indicative of impending delivery, are manifested in fewer smooth muscle cells, expansion of the extracellular space, and lower presence of collagen fibers. MRI detected three distinctive zones in pregnant mouse endocervix: (1) inner collagenous layer, (2) middle circular muscular layer, and (3) outer longitudinal muscular layer. Diffusion MRI images detected changes in tissue organization as gestation progressed suggesting the potential application of this technique to non-invasively monitor cervical changes that precede the onset of labor in women at risk for preterm delivery.

Collagen Receptor Signaling in Platelets and Megakaryocytes

1999 ◽  
Vol 82 (08) ◽  
pp. 365-376 ◽  
Author(s):  
Steve Watson
Keyword(s):  
Platelet Activation ◽  
Platelet Adhesion ◽  
Collagen Fibers ◽  
Severe Bleeding ◽  
Platelet Surface ◽  
Collagen Receptors ◽  
Intracellular Signals ◽  
Von Willebrand ◽  
Surface Glycoproteins

IntroductionThe extracellular matrix protein, collagen, plays a primary role in hemostasis. Collagen fibers provide an important site for adhesion of platelets to the exposed subendothelium, trapping them at the site of vascular damage and enabling the formation of a monolayer of cells over the damaged area. Collagen fibers also stimulate platelet activation, leading to inside-out regulation of the integrin glycoprotein (GP) IIb-IIIa (also known as αIIbβ3), secretion from dense and α granules, generation of thromboxanes, and expression of procoagulant activity, all of which support the hemostatic process. The role of collagen in supporting platelet adhesion to the subendothelium is mediated through indirect and direct interactions. The indirect interaction is mediated through von Willebrand factor (vWF), which binds to the GP Ib-IX-V complex on the platelet surface.1-3 The interaction with vWF is critical for platelet adhesion at medium to high rates of flow because of the fast rate of association between vWF and GP Ib-IX. The importance of this interaction is demonstrated by the severe bleeding problems experienced by individuals with functional impairment of vWF (von Willebrand disease) or GP Ib-IX (Bernard-Soulier syndrome). At low rates of flow, collagen fibers are able to support adhesion in the absence of vWF through a direct interaction with a number of platelet surface glycoproteins i.e. collagen receptors,4,5 this also serves to support vWF-dependent adhesion at higher rates of flow by preventing dissociation. Crosslinking of platelet surface glycoproteins by collagen also generates intracellular signals, leading to platelet activation.The number of proteins on the platelet surface proposed to be collagen receptors is approaching double figures, but it is generally accepted that the integrin GP Ia-IIa (also known as α2β1) and glycoprotein VI (GP VI) are among the most important of these, playing critical roles in adhesion and activation, respectively6 (Fig. 1). This is illustrated by the mild bleeding problems of patients with a low level of expression or the presence of autoantibodies to GP Ia-IIa and the spontaneous, severe bleeding episodes that are occasionally seen in patients whose platelets are deficient in GP VI.6 There is evidence, however, that other collagen receptors have supporting roles in adhesion and activation. For example, GP VI supports platelet adhesion to collagen7 and GP IV, also known as CD36, may also play a similar role.8 The role of the recently cloned collagen receptor p65 in adhesion is not known. Evidence that the interaction of collagen with receptors, such as GPIV and p65, is of less importance than for interactions with GP Ia-IIa, and GP VI is provided by the absence of individuals with bleeding problems caused by deficiencies in these proteins. This is illustrated most clearly for GP IV, which is absent in 3% to 5 % of the Japanese population, and yet such individuals display no major vascular problems.Due to the large number of glycoproteins that bind collagen on the platelet surface, it has been difficult to gain a full understanding of the role of individual collagen receptors in adhesion and activation responses. This is complicated further by the interactions between vWF and GP Ib-IX-V, vWF or fibrinogen to activated GP IIb-IIIa especially as both glycoprotein receptors generate intracellular signals. The relative importance of individual collagen receptors in adhesion also varies with the rate of flow and between collagen types. A full discussion of platelet adhesion to collagen is beyond the scope of this article, and the reader is referred to a number of excellent recent reviews for further information.4-6,9,10 The present chapter focuses on the signaling events generated by the activation (or more correctly crosslinking) of platelet surface glycoproteins by collagen and the implications that this has for platelet activation under normal and diseased conditions.

scholarly journals Tratamento cirúrgico do ceratocisto odontogênico por meio de enucleação e osteotomia periférica: relato de caso

2020 ◽  
Vol 9 (6) ◽  
pp. 531-534
Author(s):  
Diogo Henrique Marques ◽  
Maylson Alves Nogueira Barros ◽  
Vitor Bruno Teslenco ◽  
Cláudio Marcio Santana Junior ◽  
Lucas Marques Meurer ◽  
...  
Keyword(s):  
Case Report ◽  
Meta Analysis ◽  
Benign Lesion ◽  
Dentigerous Cyst ◽  
Case Series ◽  
Odontogenic Keratocyst ◽  
Imaging Features ◽  
Retrospective Case ◽  
Odontogenic Keratocysts

Introdução: Os ceratocistos odontogênicos (CCA) são considerados raros cistos de desenvolvimento, derivados dos remanescentes da lâmina dentária, com atividade intraóssea benigna, porém localmente invasivo e agressivo. O tratamento para o ceratocisto odongênico é variado, podendo-se encontrar modalidades tais como:enucleação, isolada ou associada a curetagem, com osteotomia periférica, aplicação da solução de Carnoy ou crioterapia, descompressão, marsupialização e ressecções. Objetivo: O presente trabalho tem como objetivo relatar um caso de ceratocisto odontogênico, onde foi escolhida abordagem conservadora por curetagem e osteotomia periférica. Relato de caso: Paciente de 68 anos, leucoderma, referiu ao exame clínico dor espontânea em região retromolar esquerda e parestesia em lábio inferior. A paciente foi submetida a biopsia por aspiração e excisional, após confirmação histopatológica foi proposto uma enucleação associada a osteotomia periférica sob anestesia geral. A paciente permanece em acompanhamento clínico e radiográfico, sem sinais de recidiva da lesão. Conclusão: Embora apresentem um comportamento agressivo, os ceratocistos odontogêncios podem ser tratados com segurança, de forma conservadora, por meio de enucleação seguida de osteotomia periférica com mínimo de morbidade. Descritores: Osteotomia; Curetagem; Cistos Odontogênicos. Referências Borghesi A, Nardi C, Giannitto C, Tironi A, Maroldi R, Di Bartolomeo F, Preda L. Odontogenic keratocyst: imaging features of a benign lesion with an aggressive behaviour. Insights Imaging. 2018 Oct;9(5):883-897. Park JH, Kwak EJ, You KS, Jung YS, Jung HD. Volume change pattern of decompression of mandibular odontogenic keratocyst. Maxillofac Plast Reconstr Surg. 2019 Jan 7;41(1):2.  Karaca C, Dere KA, Er N, Aktas A, Tosun E, Koseoglu OT, Usubutun A. Recurrence rate of odontogenic keratocyst treated by enucleation and peripheral ostectomy: Retrospective case series with up to 12 years of follow-up. Med Oral Patol Oral Cir Bucal. 2018 Jul 1;23(4):e443-e448.  Guerra LAP, Silva PS, Dos Santos RLO, Silva AMF, Albuquerque DP. Tratamento conservador de múltiplos tumores odontogênicos ceratocístico em paciente não sindrômico. Rev cir traumatol. buco-maxilo-fac. 2013; 13(2):43-50. Sundaragiri KS, Saxena S, Sankhla B, Bhargava A. Non syndromic synchronous multiple odontogenic keratocysts in a western Indian population: A series of four cases. J Clin Exp Dent. 2018;10(8):e831-6. Freitas AD, Veloso DA, Santos ALF, Freitas VA. Maxillary odontogenic keratocyst: a clinical case report. RGO Rev Gaúch Odontol. 2015; 63(4):484-88. Madhireddy MR, Prakash AJ, Mahanthi V, Chalapathi KV. Large Follicular Odontogenic Keratocyst affecting Maxillary Sinus mimicking Dentigerous Cyst in an 8-year-old Boy: A Case Report and Review. Int J Clin Pediatr Dent. 2018 Jul-Aug;11(4):349-351.  Moura BS, Cavalcante MA, Hespanhol W. Tumor odontogênico ceratocistico. Rev Col Bras Cir., 2016;43(6):466-71. Valori FP, Costa E, Buscatti MY, Oliveira JX, Costa C. Tumor odontogênico queratocístico: características intrínsecas e elucidação da nova nomenclatura do queratocisto odontogênico. J Health Sci Inst. 2010;28(1):80-3. Slusarenko da Silva Y, Stoelinga PJW, Naclério-Homem MDG. The presentation of odontogenic keratocysts in the jaws with an emphasis on the tooth-bearing area: a systematic review and meta-analysis. Oral Maxillofac Surg. 2019;23(2):133-47.

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