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1.
Talanta ; 254: 124098, 2023 Mar 01.
Artículo en Inglés | MEDLINE | ID: mdl-36462279

RESUMEN

The development potential for oocytes can be predicted by their mechanical properties. One important parameter that is measured to calculate oocyte hardness is Cortical Tension (CT). In this work, for the first time, we present the design, simulation, and fabrication of a new aspiration microfluidic chip to measure the CT of oocytes and then predict their maturation capability in the Germinal Vesicle (GV) stage. This high-performance technique facilitates oocyte characterization and is a promising alternative to traditional methods such as MicroPipette Aspiration (MPA). The proposed technique involves considerably simpler operation, less specialized equipment, and less technical skill than MPA. The proposed microfluidic channel also promises faster measurements. It is shown that in order to completely continue the growth process of oocytes in GV stage, the CT should be in a certain range: very low or very high CTs lead to unsuccessful growth. The obtained results show that 79% of oocytes with the CT between 1.5 and 3 nN/µm reach the Metaphase II (MII) stage, whereas the growth for 78% of oocytes with the CT less than 1.5 nN/µm or higher than 3 nN/µm stops at the GV or Germinal Vesicle Break Down (GVBD) stages. Another property, kvis, that points to the viscous behavior of oocytes is also measured. It is seen that 80% of GV oocytes with the kvis values between 15 and 30 k Pa s/m reach the MII stage.


Asunto(s)
Microfluídica , Oocitos , Metafase , Núcleo Celular
2.
Dis Esophagus ; 32(11)2019 Dec 30.
Artículo en Inglés | MEDLINE | ID: mdl-31310661

RESUMEN

In patients with eosinophilic esophagitis (EoE), symptoms often do not correlate with peak eosinophil counts (PEC) determined on histopathological examination of biopsy specimens. This may be because eosinophils degranulate during active disease and lose their morphological identity as intact cells and, therefore, are not enumerated on microscopic examination. Eosinophil granule proteins that are released into tissues with degranulation, including major basic protein 1 (eMBP1), likely contribute to disease pathogenesis and, therefore, may correlate with symptoms better than PEC. We sought to determine whether symptoms in patients with EoE more closely relate to eosinophil granule protein deposition than to eosinophil enumeration, especially in patients with fewer than 15 eosinophils per high power field (HPF). Esophageal biopsy specimens from 34 patients diagnosed with EoE were obtained for histopathological examination and for evaluation of eMBP1 staining by indirect immunofluorescence. PEC by histopathology were compared to extracellular eMBP1 grades by immunostaining. PEC and eMBP1 grades also were analyzed for their relationship to symptoms and clinical course. Biopsy specimens from 19 of the 34 patients had fewer than 15 PEC on histopathological examination, and the other 15 patients had 15 or greater PEC. Positive eMBP1 immunostaining was found in all symptomatic patients. EoE symptoms were related to eMBP1 immunostaining grades (p = 0.0001), but not PEC (P = 0.14). Eosinophil granule protein deposition, specifically eMBP1, is increased in esophageal biopsy specimens from symptomatic patients with EoE and may be a marker of disease activity, including patients with EoE who have 'resolved' disease.


Asunto(s)
Proteína Mayor Básica del Eosinófilo/metabolismo , Esofagitis Eosinofílica/metabolismo , Esofagitis Eosinofílica/patología , Eosinófilos/patología , Proteoglicanos/metabolismo , Adulto , Anciano , Enfermedades Asintomáticas , Biomarcadores/metabolismo , Biopsia , Mucosa Esofágica/patología , Femenino , Humanos , Recuento de Leucocitos , Masculino , Persona de Mediana Edad , Evaluación de Síntomas , Adulto Joven
3.
Aliment Pharmacol Ther ; 41(12): 1288-95, 2015 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-25898774

RESUMEN

BACKGROUND: Acknowledging that eosinophilic esophagitis (EoE) is a disease with variable involvement throughout the oesophagus, studies have suggested a minimum of five biopsies to diagnose EoE. Although it is accepted that furrows and exudates appear to represent areas of inflammation, no research to date has looked specifically at EoE endoscopic findings to see if eosinophilic infiltrate correlates with specific endoscopic findings. AIM: To evaluate the distribution of eosinophils in EoE and determine whether endoscopic appearances predict the degree of eosinophilia at various locations of the oesophagus. METHODS: We performed a prospective cross sectional study of EoE (treated and untreated) patients to study the distribution of eosinophils according to endoscopic findings. The oesophagus of 10 EoE patients were biopsied up to 32 times in a circumferential manner. The mucosal changes were documented at the site of each biopsy. Histological determination of eosinophil counts and related histopathology of the oesophagus were then correlated with endoscopic findings. Similar biopsy assessments were made in treated (resolved) EoE patients (n = 6) to determine the permanence of specific endoscopic appearances. RESULTS: A total of 16 patients were biopsied (10 EoE, 6 treated EoE). A total of 432 biopsies were obtained in all with 294 biopsies from 10 EoE subjects. Eosinophil density was increased distally in the majority of EoE patients. Biopsies performed in areas of exudates and furrows demonstrated higher eosinophil counts. Lines and normal-appearing oesophagi in EoE subjects were not commonly associated with elevated eosinophil counts (>15 eos/HPF). Rings alone without associated furrows or plaques did not demonstrate elevated eosinophil counts and were seen in resolved EoE (Rx-EoE) as well as in active EoE patients. CONCLUSIONS: Eosinophilic esophagitis remains a variable disease with some patients manifesting extensive disease throughout the oesophagus. Characteristics of furrows and exudates found during endoscopy are associated with higher peak eosinophil counts, requiring fewer biopsies to make a diagnosis. Lines and otherwise normal appearances of the oesophagus suggest a milder mucosal eosinophilia, requiring substantial biopsies to adequately identify fields with diagnostic eosinophil counts.


Asunto(s)
Esofagitis Eosinofílica/diagnóstico , Esofagitis Eosinofílica/patología , Adulto , Biopsia , Estudios Transversales , Diagnóstico Diferencial , Endoscopía , Eosinofilia/patología , Eosinófilos/metabolismo , Femenino , Humanos , Inflamación/patología , Recuento de Leucocitos , Masculino , Meridianos , Persona de Mediana Edad , Membrana Mucosa/patología , Estudios Prospectivos
4.
Med J Malaysia ; 62(3): 194-6, 2007 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-18246905

RESUMEN

Meningioma, is the second most frequent intracranial tumor in Malaysia and are classified according to the World Health Organization classification. The relationship of p53 protein in the determination of meningioma grading and their influencing factors were studied via immunohistochemistry studies on 77 intracranial meningiomas (67 benign, 10 atypical). The higher the p53 reaction was correlated to the poorer the histological grade (19.4% in benign and 90% in atypical meningioma) (p < 0.001). Other variables like age, sex, ethnicity, demographic location, surgical clearance, midline shift and contrast enhancement of CT Scan Brain and clinical features were found not to be significant.


Asunto(s)
Neoplasias Encefálicas/patología , Meningioma/clasificación , Proteína p53 Supresora de Tumor , Anciano , Neoplasias Encefálicas/clasificación , Estudios Transversales , Femenino , Humanos , Inmunohistoquímica , Malasia , Masculino , Persona de Mediana Edad , Neurocirugia
5.
Med J Malaysia ; 52(1): 86-8, 1997 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-10968060

RESUMEN

Primary non-Hodgkin's lymphoma of the brain is rare. Majority of the lesions are intraaxial, multicentric and involve the leptomeninges. We report a case of malignant primary non-Hodgkin's lymphoma arising from the cranial vault. Computed tomography of the brain showed an extraaxial lesion in the right parietal region mimicking a meningioma.


Asunto(s)
Neoplasias Encefálicas/diagnóstico , Linfoma no Hodgkin/diagnóstico , Meningioma/diagnóstico , Humanos , Masculino , Persona de Mediana Edad
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