Nuclear export of the oncoprotein v-ErbA is mediated by acquisition of a viral nuclear export sequence.

v-ErbA, an oncogenic derivative of the thyroid hormone receptor alpha (TRalpha) carried by the avian erythroblastosis virus, contains several alterations including fusion of a portion of avian erythroblastosis virus Gag to its N terminus, N- and C-terminal deletions, and 13 amino acid substitutions. Nuclear export of v-ErbA occurs through a CRM1-mediated pathway. In contrast, nuclear export of TRalpha and another isoform, TRbeta, is CRM1-independent.

The value of Ureaplasma urealyticum tracheal culture and treatment in premature infants following an acute respiratory deterioration.

Objective: To determine if treatment of Ureaplasma urealyticum (Uu), found at the time of an acute respiratory deterioration, decreases the incidence of chronic lung disease (CLD) in very low birth weight infants (VLBW).

Study Design: Between 1996 and 1999, medical records of all mechanically ventilated VLBW infants, who had an acute respiratory deterioration, were reviewed for gestational age (GA), birth weight (BW), gender, presence of CLD, Uu tracheal cultures, and erythromycin treatment.

Results: A total of 100 patients met our inclusion criteria (GA: 26.