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Doctoral Thesis
DOI
https://doi.org/10.11606/T.5.2007.tde-21062007-142408
Document
Author
Full name
Ana Paula Pereira Velosa
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2007
Supervisor
Committee
Yoshinari, Natalino Hajime (President)
Andrade, Luis Eduardo Coelho
Barros, Percival Degrava Sampaio
Borges, Claudia Tereza Lobato
Zerbini, Cristiano Augusto de Freitas
Title in Portuguese
Indução de tolerância nasal com colágeno tipo V em modelo experimental de esclerodermia
Keywords in Portuguese
Coelhos.
Colágeno tipo V
Escleroderma sistêmico
Modelos animais
Mucosa nasal
Tolerância imunológica
Abstract in Portuguese
Objetivo: Verificar o remodelamento da pele e produção de anticorpos em modelo experimental de esclerodermia em coelhos, após indução de tolerância nasal com colágeno tipo V. Métodos: Coelhas Nova Zelândia (N=12) foram imunizadas com 1mg/ml de colágeno V (Col V) em adjuvante completo de Freund e dois reforços com adjuvante incompleto de Freund. Seis coelhas imunizadas receberam uma dose diária de 25ug de Col V, iniciado via nasal (grupo tolerado) 150 dias do começo das imunizações e seis animais foram somente imunizadas (grupo imunizado). Um grupo imunizado com adjuvante de Freund serviu como controle. Biopsias de pele foram coletadas em 0, 75, 120, 150 e 210 dias e coradas pelo H&E, tricrômico de Masson e Sírius red para analise morfológica e morfométrica. Os colágenos I, III e V, além de TGFbeta e PDGF foram imunomarcados por imunofluorescência. Os soros dos animais foram coletados em 0, 150 e 210 dias para determinar anticorpos anti-colágenos I, III, IV e V e anti-nucleares. Resultados: Os animais imunizados mostraram progressivo decréscimo da derme papilar, atrofia de anexos, aumento no depósito dos colágenos I, III e V e aumento da expressão de TGFbeta e PDGF. Os tolerados apresentaram aumento dos anexos cutâneos e significante diminuição no depósito dos colágenos I, III e V, TGFbeta e PDGF. O grupo de imunizados e de tolerados apresentaram anticorpos anti-colágenos III e IV e antinucleares. Conclusões: A indução de tolerância nasal com Col V diminuiu o remodelamento da pele observado no modelo experimental de esclerodermia e inibiu a síntese de citocinas fibrogênicas. Portanto, a tolerância nasal com Col V pode ser uma opção terapêutica promissora para o controle do remodelamento cutâneo em pacientes com esclerodermia.
Title in English
Collagen V- induced nasal tolerance in scleroderma experimental model
Keywords in English
Animal models
Immunologic tolerance
Nasal mucous
Rabbits
Systemic sclerosis
Type V collagen
Abstract in English
Objective: Our aim was to verify the skin remodeling and antibody production in experimental model of scleroderma in rabbits, after induction of tolerance by daily nasal administration of human type V collagen (Col V). Methods: Female New Zealand rabbits (N=12) were immunized with 1mg/ml of Col V in complete Freund's adjuvant, followed by more two boosters in incomplete Freund's adjuvant. Six immunized rabbits received daily nasal administrating of 25ug of Col V (tolerated group), started 150 days after the first immunization, and the others animals (N=6) were only immunized (immunized group). Finally a group of rabbits immunized with Freund's adjuvant served as control. Skin biopsies were collected at 0, 75, 120, 150 and 210 days, and stained with H&E, Masson's trichrome and Sirius red for morphological and morphometric analysis. Types I, III and V collagen, TGFbeta and PDGF were immunostained by immunofluorescence. The sera of animals were colleted at 0, 150 and 210 days to determine anti types I, III, IV and V collagen and antinuclear antibodies. Results: The immunized animals showed progressive decrease of papillary dermis, appendages atrophy, increase of types I, III and V collagen deposition and increased expression of TGF-beta and PDGF. The tolerated rabbits presented increase of cutaneous appendages and significant decrease of types I, III and V and TGF-beta and PDGF. Both immunized and tolerated rabbits presented anti types III and IV antibodies and antinuclear antibodies. Conclusions: Col V nasal tolerance reduced skin remodeling in experimental model of scleroderma and inhibited synthesis of fibrotic cytokines. Therefore, the nasal tolerance with type V collagen can be a promising therapeutic option to control the skin remodeling in patients with scleroderma.
 
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Publishing Date
2007-07-10
 
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