Changes in purinergic signalling in developing and ageing rat tail artery: importance for temperature control

Area of Science:

• Vascular biology
• Pharmacology
• Physiology

Background:

• P2 receptors are crucial in regulating vascular tone.
• Their role in arterial development and aging is not fully understood.

Purpose of the Study:

• To investigate P2 receptor expression and function in rat tail and mesenteric arteries across different ages.
• To determine age-related changes in purinergic signaling in these vascular beds.

Main Methods:

• Functional studies (e.g., contractility assays) were performed on isolated arteries.
• Immunohistochemistry was used to assess P2 receptor subtype expression.
• Animals were studied at various ages: 4, 6, 12 weeks, and 8, 24 months.

Main Results:

• Tail artery responses to ATP, alpha,beta-meATP, and UTP decreased with age, correlating with reduced P2X1 and P2Y2 receptor expression.
• Contractile responses to 2-MeSADP and P2Y1 receptor expression also declined with age in the tail artery.
• Mesenteric artery showed age-related changes in relaxation to 2-MeSADP (P2Y1 mediated) but not consistently in contraction to UTP (P2Y2 mediated).

Conclusions:

• P2 receptor phenotype and function exhibit significant age-dependent alterations in rat tail arteries, more so than in mesenteric arteries.
• These changes may be linked to the tail artery's role in thermoregulation.
• Age impacts purinergic signaling differently across distinct vascular beds.