Reação em cadeia da polimerase e proteinograma no diagnóstico da leishmaniose ocular canina
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Data
2011-07-14
Autores
Barbosa, Virginia Tessarine [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
A leishmaniose ocular canina envolve um complexo de alterações decorrentes da atuação do agente nos diversos tecidos oculares. Valendo-se de cães com sorologia positiva para a doença, portadores (G1) ou não (G2) de alterações oftálmicas, com este estudo avaliou-se: o exame parasitológico de esfregaço a partir de swab conjuntival, a presença do parasito, pela PCR, em fragmento conjuntival e no humor aquoso (HA) e as concentrações protéicas, pela eletroforese, no HA. O parasitológico de esfregaço a partir do swab conjuntival foi positivo em 60% e 38,1% dos animais do G1 e do G2, respectivamente, com a oddsratio de 2,438 para positividade em tal parâmetro nos cães do G1, comparativamente aos do G2. A positividade na PCR de fragmento conjuntival foi maior no G1 (p < 0,005), com oddsratio igual a 17,31 quando comparados G1 e G2. O parasito não foi detectado no HA de qualquer dos grupos. Houve correlação fracopositiva entre as concentrações de IgG e de albumina séricas e do HA. Diferenças significativas foram encontradas entre os grupos, quando comparadas as proteínas totais, IgG, e proteína de peso molecular 33 kDa no HA. A haptoglobina foi detectada apenas no HA dos cães do G1. Os dados apontam para uma tendência dos cães com sinais oftálmicos serem positivos no parasitológico de esfregaço a partir do swab conjuntival e na PCR de conjuntiva, podendo, o método ser útil no diagnóstico parasitológico da leishmaniose visceral canina. Proteínas de fase aguda merecem mais avaliações quanto ao seu valor diagnóstico para esta enfermidade
Canine ocular leishmaniasis involves several ophthalmic alterations owing to the action of the parasite in numerous ocular tissues. Therefore, dogs serologically positive for leishmaniasis either presenting (G1) or not (G2) ocular alterations were enrolled in this study to evaluate the conjunctival cytology as a method for the diagnosis of this disease, the detection of the parasite in conjunctival tissue samples and in the aqueous humor using PCR, as well as the serum and aqueous humor protein concentrations determined by electrophoresis. The parasitological evaluation of the swabs disclosed 60% and 38.1% of positivity in dogs of groups 1 and 2, respectively, with a calculated oddsratio of 2.438 for a single animal testing positive in this procedure when ocular changes existed. The documented PCR results were more expressive in G1 dogs (P<0,005), with an oddsratio of 17,81 for the animals of this group testing positive using this method as compared to G2. The parasite was not found in the aqueous humor of either group. A weak positive correlation was calculated between the serum and aqueous humor IgG and albumin concentrations, and significant differences were found to exist between groups regarding total protein, IgG, and 33 kDa protein measured in the aqueous humor. Also, haptoglobin was detected only in the aqueous humor of G1 dogs. Our data suggest a tendency of dogs with ocular signs testing positive on the conjunctival swab exams and PCR, being these methods useful in the diagnosis of canine leishmaniasis. However, acute phase proteins require a more detailed evaluation concerning its diagnostic value for this disease
Canine ocular leishmaniasis involves several ophthalmic alterations owing to the action of the parasite in numerous ocular tissues. Therefore, dogs serologically positive for leishmaniasis either presenting (G1) or not (G2) ocular alterations were enrolled in this study to evaluate the conjunctival cytology as a method for the diagnosis of this disease, the detection of the parasite in conjunctival tissue samples and in the aqueous humor using PCR, as well as the serum and aqueous humor protein concentrations determined by electrophoresis. The parasitological evaluation of the swabs disclosed 60% and 38.1% of positivity in dogs of groups 1 and 2, respectively, with a calculated oddsratio of 2.438 for a single animal testing positive in this procedure when ocular changes existed. The documented PCR results were more expressive in G1 dogs (P<0,005), with an oddsratio of 17,81 for the animals of this group testing positive using this method as compared to G2. The parasite was not found in the aqueous humor of either group. A weak positive correlation was calculated between the serum and aqueous humor IgG and albumin concentrations, and significant differences were found to exist between groups regarding total protein, IgG, and 33 kDa protein measured in the aqueous humor. Also, haptoglobin was detected only in the aqueous humor of G1 dogs. Our data suggest a tendency of dogs with ocular signs testing positive on the conjunctival swab exams and PCR, being these methods useful in the diagnosis of canine leishmaniasis. However, acute phase proteins require a more detailed evaluation concerning its diagnostic value for this disease
Descrição
Palavras-chave
Cão, Leishmania, Conjuntiva, Humor aquoso, Dog, Conjunctive, Aqueous humor
Como citar
BARBOSA, Virginia Tessarine. Reação em cadeia da polimerase e proteinograma no diagnóstico da leishmaniose ocular canina. 2011. iv, 53 f. Tese (doutorado) - Universidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias, 2011.