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1.
Am J Vet Res ; 83(4): 312-316, 2022 Jan 12.
Artigo em Inglês | MEDLINE | ID: mdl-35038304

RESUMO

OBJECTIVE: To investigate the predictive value of right axis deviation of the mean electrical axis (MEA) in assessing the severity of pulmonic stenosis (PS) in dogs. ANIMALS: Records for 218 client-owned dogs diagnosed between 2014 and 2020 with PS as determined by Doppler echocardiography. PROCEDURES: University of Florida Small Animal Clinic medical records were reviewed, and signalment and clinical risk variables (murmur grade and clinical signs) were extracted. MEA was determined from ECG records by use of leads I and III. Predictive potential of MEA and associated risk factors to diagnose PS severity (mild [< 50 mm Hg], moderate, or severe [> 75 mm Hg]) were assessed by receiver-operating characteristic curve analysis and quantile regression. RESULTS: Records for 88 dogs were eligible for analysis. Greater PS severity was associated with smaller breeds presenting with ECG abnormalities, overt clinical signs, and high-category murmur grades (IV and V). Mean MEA increased with stenosis severity category, with an average of 62° for mild, 113° for moderate, and 157° for severe. Each 10° increase in MEA corresponded to an approximately 5-mm Hg increase in PG. Increasing PS severity was associated with MEA right axis deviation > 100° and the more severe cases (PG > 75 mm Hg) with MEA right axis deviation > -180°. CLINICAL RELEVANCE: Mean electrical axis right axis deviation may be a useful screening metric for dogs with suspected moderate to severe PS.


Assuntos
Doenças do Cão , Estenose da Valva Pulmonar , Animais , Doenças do Cão/diagnóstico por imagem , Cães , Ecocardiografia Doppler/veterinária , Eletrocardiografia/veterinária , Humanos , Estenose da Valva Pulmonar/diagnóstico , Estenose da Valva Pulmonar/veterinária , Estudos Retrospectivos
2.
Can J Vet Res ; 86(1): 13-19, 2022 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-34975217

RESUMO

The purpose of this pilot study was to detect the presence of interleukin-8 (IL-8) and the potential downstream effects of IL-8 receptor activation in 2 previously characterized feline oral squamous cell carcinoma cell lines (SCCF1 and SCCF2). Interleukin-8 messenger RNA (mRNA) was initially detected by quantitative reverse transcription polymerase chain reaction (qRT-PCR). A previously validated and commercially available enzyme-linked immunosorbent assay (ELISA) test was used to measure IL-8 production in the supernatant of the 2 cell lines. Western blot was used to detect phosphorylation of proteins (AKT, ERK1/2, JAK2, STAT3, and Src), known to be downstream of interleukin-8 receptor activation. The IL-8 receptor-specific antagonists, Reparixin and SCH527123, were used to identify effects on phosphorylation of these proteins. Interleukin-8 mRNA and protein were detected in both SCCF1 and SCCF2 by RT-PCR and ELISA, respectively. Phosphorylation of ERK1/2, STAT3, and Src was detected in both cell lines. Inhibition of the IL-8 receptor led to a decrease in phosphorylation of Src, but not ERK1/2 or STAT3. In conclusion, feline squamous cell carcinoma cell lines can produce IL-8. Phosphorylation of Src seems, at least in part, a consequence of IL-8 receptor activation. The phosphorylation of ERK1/2 and STAT3, although present, seems independent of IL-8 receptor activation. Due to its potential effects on the tumor microenvironment, in addition to its autocrine effects on Src phosphorylation, the inhibition of the IL-8 receptor may become a beneficial therapeutic tool. Evaluation of the presence of both IL-8 and Src in many cases should elucidate their importance.


Le but de cette étude pilote était de détecter la présence d'interleukine-8 (IL-8) et les effets potentiels en aval de l'activation du récepteur IL-8 dans deux lignées cellulaires de carcinome épidermoïde oral félin (SCCF1 et SCCF2) précédemment caractérisées. L'ARN messager de l'interleukine-8 (ARNm) a été initialement détecté par amplification en chaîne par la polymérase à transcription inverse quantitative (qRT-PCR). Un test immuno-enzymatique ELISA précédemment validé et disponible dans le commerce a été utilisé pour mesurer la production d'IL-8 dans le surnageant des deux lignées cellulaires. L'immunobuvardage a été utilisé pour détecter la phosphorylation des protéines (AKT, ERK1/2, JAK2, STAT3 et Src), connues pour être en aval de l'activation du récepteur de l'interleukine-8. Les antagonistes spécifiques du récepteur IL-8, Reparixin et SCH527123, ont été utilisés pour identifier les effets sur la phosphorylation de ces protéines. L'ARNm et la protéine de l'interleukine-8 ont été détectés dans SCCF1 et SCCF2 par RT-PCR et ELISA, respectivement. La phosphorylation de ERK1/2, STAT3 et Src a été détectée dans les deux lignées cellulaires. L'inhibition du récepteur IL-8 a conduit à une diminution de la phosphorylation de Src, mais pas ERK1/2 ou STAT3. En conclusion, les lignées cellulaires de carcinome épidermoïde félin sont capables de produire de l'IL-8. La phosphorylation de Src semble, au moins en partie, une conséquence de l'activation du récepteur IL-8. La phosphorylation de ERK1/2 et STAT3, bien que présente, semble indépendante de l'activation du récepteur IL-8. En raison de ses effets potentiels sur le micro-environnement tumoral, en plus de ses effets autocrines sur la phosphorylation de Src, l'inhibition du récepteur IL-8 peut devenir un outil thérapeutique bénéfique. L'évaluation de la présence à la fois d'IL-8 et de Src dans un grand nombre de cas devrait élucider leur importance.(Traduit par Docteur Serge Messier).


Assuntos
Carcinoma de Células Escamosas , Doenças do Gato , Interleucina-8 , Neoplasias Bucais , Transdução de Sinais , Animais , Carcinoma de Células Escamosas/metabolismo , Carcinoma de Células Escamosas/veterinária , Doenças do Gato/metabolismo , Gatos , Linhagem Celular Tumoral , Interleucina-8/genética , Interleucina-8/metabolismo , Neoplasias Bucais/metabolismo , Neoplasias Bucais/veterinária , Projetos Piloto , RNA Mensageiro/isolamento & purificação , Microambiente Tumoral
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