TGFB1 and asthma: Accordingly, infections with the rodent filarial nematode Litomosoides sigmodontis suppressed asthma symptoms in a murine asthma model8, protected nonobese diabetic (NOD) mice from the onset of type 1 diabetes in a transforming growth factor (TGF)β dependent manner9 and improved glucose tolerance in diet-induced obese mice10.