Insulin is secreted upon glucose stimulation by both gastrointestinal enteroendocrine K-cells and L-cells engineered with the preproinsulin gene

Encina, Gonzalo; Ezquer, Fernando; Conget, Paulette; Israel, Yedy

Encina, Gonzalo; Ezquer, Fernando; Conget, Paulette; Israel, Yedy.

Afiliação

Encina, Gonzalo; Universidad de Chile. Department of Pharmacological and Toxicological Chemistry. Laboratory of Gene Therapy. Santiago. CL
Ezquer, Fernando; Universidad del Desarrollo. Facultad de Medicina. Instituto de Ciencias. Clínica Alemana. Santiago. CL
Conget, Paulette; Universidad del Desarrollo. Facultad de Medicina. Instituto de Ciencias. Clínica Alemana. Santiago. CL
Israel, Yedy; Universidad de Chile. Department of Pharmacological and Toxicological Chemistry. Laboratory of Gene Therapy. Santiago. CL

Biol. Res ; 44(3): 301-305, 2011. ilus

Article em En | LILACS | ID: lil-608627

Biblioteca responsável: BR1.1

ABSTRACT

ABSTRACT

Transgenic mice carrying the human insulin gene driven by the K-cell glucose-dependent insulinotropic peptide (GIP) promoter secrete insulin and display normal glucose tolerance tests after their pancreatic p-cells have been destroyed. Establishing the existence of other types of cells that can process and secrete transgenic insulin would help the development of new gene therapy strategies to treat patients with diabetes mellitus. It is noted that in addition to GIP secreting K-cells, the glucagon-like peptide 1 (GLP-1) generating L-cells share/ many similarities to pancreatic p-cells, including the peptidases required for proinsulin processing, hormone storage and a glucose-stimulated hormone secretion mechanism. In the present study, we demonstrate that not only K-cells, but also L-cells engineered with the human preproinsulin gene are able to synthesize, store and, upon glucose stimulation, release mature insulin. When the mouse enteroendocrine STC-1 cell line was transfected with the human preproinsulin gene, driven either by the K-cell specific GIP promoter or by the constitutive cytomegalovirus (CMV) promoter, human insulin co-localizes in vesicles that contain GIP (GIP or CMV promoter) or GLP-1 (CMV promoter). Exposure to glucose of engineered STC-1 cells led to a marked insulin secretion, which was 7-fold greater when the insulin gene was driven by the CMV promoter (expressed both in K-cells and L-cells) than when it was driven by the GIP promoter (expressed only in K-cells). Thus, besides pancreatic p-cells, both gastrointestinal enteroendocrine K-cells and L-cells can be selected as the target cell in a gene therapy strategy to treat patients with type 1 diabetes mellitus.

Assuntos

Animais; Humanos; Camundongos; Células Enteroendócrinas/fisiologia; Polipeptídeo Inibidor Gástrico/farmacologia; Peptídeo 1 Semelhante ao Glucagon/farmacologia; Glucose/farmacologia; Células Secretoras de Insulina/metabolismo; Insulina; Precursores de Proteínas/genética; Diabetes Mellitus Tipo 1/terapia; Células Enteroendócrinas/efeitos dos fármacos; Engenharia Genética; Terapia Genética/métodos; Hipoglicemiantes/farmacologia; Células Secretoras de Insulina/citologia; Insulina/genética; Camundongos Transgênicos

Palavras-chave

Gastrointestinal enteroendocrine cells; K-cells; L-cells; Preproinsulin gene; Type 1 diabetes mellitus

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Texto completo: 1 Coleções: 01-internacional Base de dados: LILACS Assunto principal: Precursores de Proteínas / Polipeptídeo Inibidor Gástrico / Células Enteroendócrinas / Células Secretoras de Insulina / Peptídeo 1 Semelhante ao Glucagon / Glucose / Insulina Limite: Animals / Humans Idioma: En Revista: Biol. Res Assunto da revista: BIOLOGIA Ano de publicação: 2011 Tipo de documento: Article / Project document País de afiliação: Chile País de publicação: Chile

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