Growth and behavioral development in plasminogen gene-targeted mice

Area of Science:

• Neuroscience
• Developmental Biology
• Biochemistry

Background:

• The plasminogen system is crucial for fibrinolysis and is implicated in nervous system development.
• Understanding plasminogen's role in neurodevelopment is essential for identifying potential therapeutic targets.

Purpose of the Study:

• To quantify the impact of plasminogen deficiency on physical and behavioral development in mice.
• To investigate the role of plasminogen in neuroendocrine regulation and stress response.

Main Methods:

• Comparative analysis of plasminogen-deficient (Plg-/-), heterozygous (Plg+/-), and wild-type (Plg+/+) mice from 2-21 days of age.
• Assessment of physical development milestones (e.g., ear detachment, eye opening, weight gain) and behavioral development (e.g., reflexes, motor coordination, seizure susceptibility).
• Evaluation of pituitary weight and corticotrophin-releasing hormone levels.

Main Results:

• No significant differences in early growth or physical development (2-21 days) between Plg-/- and WT mice.
• Delayed vaginal patency and reduced weight gain observed in Plg-/- mice after 4 weeks.
• Plg-/- mice showed altered stress responses, including faster righting reflex, faster audiogenic seizure latency, increased grooming, smaller pituitary weight, and elevated corticotrophin-releasing hormone.

Conclusions:

• Plasminogen deficiency has a limited effect on early physical and behavioral development but significantly impacts later-life stress reactivity and neuroendocrine function.
• The plasminogen system plays a role in hormone processing and neuroendocrine regulation.
• Further research is warranted to elucidate the precise mechanisms linking plasminogen to neuroendocrine pathways.