Figure 12.

Physiological function of TRPM4 and TRPM5 in pancreas beta-cells at low (A) and high (B) blood glucose levels. Solid red arrows indicate calcium flow; dash arrows indicate calcium regulation targets. Solid black, deep blue arrows indicate sodium and potassium flow, respectively. Endoplasmic reticulum serves as an important intracellular calcium store for beta-cells but is omitted due to space limitation. Only selected ion channels are shown. GLUT-2, glucose transporter 2; G-6-P, glucose 6-phosphate.