Total RNA was isolated from lung tissue with TRIzol reagent. Each 20 µl sample consists of 10 µl SYBR‑Green PCR Master mix (2X), 0.1 µM primers, 100 µg genomic DNA. The samples were amplified by qPCR using a Roche Light Cycler 480 following procedure: 95 °C 10 min, 45 cycles (95 °C 10 s, 60 °C 10 s, 72 °C 20 s), one cycle (95 °C 1 min, 65 °C 1 min, 97 °C continuous), 40 °C 30 s. Primers synthesized by Sangon Biotech (Shanghai, China), PEDF forward, 5'‑CAGAGTCTGTCATTCACCGGGC‑3'; reverse, 5'‑GTCAGCACAGCTTGGATAGTCTTC‑3'. β-actin forward, 5'‑ CTAAGGCCAACCGTGAAAAGA‑3' and reverse, 5'‑ CCAGAGGCATACAGGGACAAC‑3'. The level of PEDF mRNA were quantified through β-actin.
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