Whether airway hyperresponsiveness is a symptom of airway inflammation or airway remodeling, or whether it is the cause of long-term loss of lung function, remains controversial. Some investigators have hypothesized that aggressive treatment with anti-inflammatory therapies improves the long-term course of asthma beyond their salutary effects on parameters of asthma control and rates of exacerbation over time. 13 This contention has been supported by an observational study 14 that found long-term exposure to ICS was associated with an attenuation of the accelerated decline in lung function previously reported in asthmatics; more studies are required to substantiate these findings.
The first isolation and structure identifications of prednisone and prednisolone were done in 1950 by Arthur Nobile .    The first commercially feasible synthesis of prednisone was carried out in 1955 in the laboratories of Schering Corporation, which later became Schering-Plough Corporation , by Arthur Nobile and coworkers.  They discovered that cortisone could be microbiologically oxidized to prednisone by the bacterium Corynebacterium simplex. The same process was used to prepare prednisolone from hydrocortisone .