Which statement describes the primary renal phosphate transporter and its regulation by PTH?

Which statement describes the primary renal phosphate transporter and its regulation by PTH?

• A. NaPi-IIb (SLC34A2) reabsorbs phosphate and is stimulated by PTH
• B. NaPi-IIc (SLC34A3) reabsorbs phosphate and is inhibited by PTH
• C. NaPi-IIa (SLC34A1) reabsorbs phosphate in the proximal tubule; PTH inhibits it
• D. CaSR in distal tubule reabsorbs phosphate and is stimulated by PTH

Answer: (C)