Transgenic mouse models and peptide producing endocrine tumours: morpho-functional aspects.

Area of Science:

• Endocrinology
• Oncology
• Genetics

Background:

• Transgenic mouse models are crucial for understanding human disease.
• Endocrine tumors, particularly pancreatic neoplasms, represent a significant health concern.

Purpose of the Study:

• To review and discuss three transgenic mouse models that develop endocrine tumors.
• To evaluate the utility of these models in studying genetically dependent human pathologies.

Main Methods:

• Development of transgenic mice expressing simian virus 40 (SV40) large T-antigen.
• Analysis of tumor development in the pancreas and anterior pituitary.
• Histopathological examination of neoplastic and non-neoplastic lesions.

Main Results:

• SV40/metallothionein-growth hormone (MGH), insulin/SV40 (INS/SV40), and vasopressin/SV40 (AVP/SV40) mice developed pancreatic endocrine tumors.
• Tumors were mainly composed of insulin-producing B cells with a PP cell component.
• Hyperplasia and dysplasia were observed in INS/SV40 and AVP/SV40 pancreata.
• AVP/SV40 mice also exhibited tumor genesis in the anterior pituitary.

Conclusions:

• Transgenic mouse models effectively replicate human endocrine tumor pathology.
• These models, particularly INS/SV40 and AVP/SV40, are useful for studying pancreatic endocrine tumors.
• The models highlight the role of genetic factors in tumor development.