Results: PCP treatment significantly improved renal function in MRL/lpr mice, normalizing serum levels of anti-nuclear antibodies (ANA), anti-double-stranded DNA antibodies (anti-dsDNA), anti-Sm antibody (Sm), creatinine (Cr), blood urea nitrogen (BUN), interleukin-6 (IL-6), tumor necrosis factor-alpha (TNF-α), and proteinuria. Here, IL6 is linked to pneumocystosis.