RESUMEN
In the CNS insulin-like growth factor-1 (IGF-1) enhances survival of neurons, promotes myelin synthesis and acts as a mitogen for microglia. The effects of IGF-1 are regulated by a family of 6 IGF binding proteins (IGFBPs). We investigated mRNA expression patterns of IGFBPs in primary rat microglia under basal conditions and after activation with lipopolysaccharide (LPS). Under basal conditions, microglia expressed IGFBP-2 to -6, whereas, IGFBP-1 could not be detected. Following 2 h treatment with LPS mRNA levels for IGFBP-4 and -6 displayed a down regulation, and IGFBP-5 became undetectable. Levels of IGFBP-2 and -3 remained unaltered. Expression patterns of IGFBPs might play an important role in regulating the autocrine/paracrine IGF-1 actions on microglia under inflammatory conditions.
Asunto(s)
Proteínas de Unión a Factor de Crecimiento Similar a la Insulina/biosíntesis , Microglía/metabolismo , Animales , Células Cultivadas , Regulación de la Expresión Génica/efectos de los fármacos , Regulación de la Expresión Génica/fisiología , Proteína 1 de Unión a Factor de Crecimiento Similar a la Insulina/biosíntesis , Proteína 1 de Unión a Factor de Crecimiento Similar a la Insulina/genética , Proteína 2 de Unión a Factor de Crecimiento Similar a la Insulina/biosíntesis , Proteína 2 de Unión a Factor de Crecimiento Similar a la Insulina/genética , Proteína 3 de Unión a Factor de Crecimiento Similar a la Insulina/biosíntesis , Proteína 3 de Unión a Factor de Crecimiento Similar a la Insulina/genética , Proteína 4 de Unión a Factor de Crecimiento Similar a la Insulina/biosíntesis , Proteína 4 de Unión a Factor de Crecimiento Similar a la Insulina/genética , Proteína 5 de Unión a Factor de Crecimiento Similar a la Insulina/biosíntesis , Proteína 5 de Unión a Factor de Crecimiento Similar a la Insulina/genética , Proteína 6 de Unión a Factor de Crecimiento Similar a la Insulina/biosíntesis , Proteína 6 de Unión a Factor de Crecimiento Similar a la Insulina/genética , Proteínas de Unión a Factor de Crecimiento Similar a la Insulina/genética , Lipopolisacáridos/farmacología , Microglía/efectos de los fármacos , ARN Mensajero/biosíntesis , ARN Mensajero/genética , Ratas , Ratas WistarRESUMEN
Fragments of glycoprotein G (gG-2(281-594His)), comprising residues 281 to 594 of herpes simplex virus type 2 (HSV-2), glycoprotein G of HSV-1 (gG-1(t26-189His)), and glycoprotein D of HSV-1 (gD-1(1-313)), were expressed in the baculovirus expression system to develop an assay for the detection of HSV-1 and HSV-2 type-specific antibodies. The expression of the gG-1(t26-189His) and gG-2(281-594His) fragments was analyzed by Western blotting using monoclonal antibodies LP10 and AP1, respectively. The molecular masses of the major products of gG-1(t26-189His) and the fragment of gG-2(281-594His) were 36 to 39 kDa and 64 to 72 kDa, respectively. Human sera positive for HSV-1 reacted with gG-1(t26-189His), sera positive for HSV-2 reacted with the gG-2(281-594His) fragment, and sera positive for both types reacted with gG-1(t26-189His) and gG-2(281-594His) in Western blotting. The human sera recognized polypeptides of gG-2(281-594His) with molecular masses of 57 to 67 and 120 to 150 kDa and additional faint bands of 21, 29, and 45 kDa. The recombinant gG-1(t26-189His) and the recombinant gG-2(281-594His) fragment were used as type-specific antigens for the detection of HSV-1- and HSV-2-specific antibody responses in human sera, respectively. As type-common antigens, an extract of HSV-1-infected Vero cells and recombinant gD-1(1-313) were used. An enzyme-linked immunosorbent assay to detect type-specific antibodies was developed, and the sensitivity and specificity were evaluated by comparison with commercial tests by using sera obtained from different sources. The sensitivity and specificity were 91.5 and 95.5%, respectively, compared to the Gull assay. The gG-2(281-594His) fragment can be obtained in relatively large quantities at low cost.