Objective: We analyzed the role of transforming growth factor-beta (TGF-bet
a), a fibrogenic cytokine, in the development of left ventricular diastolic
dysfunction following heart transplantation. Methods: We studied 152 heart
transplant recipients who had survived for at least 24 months. We compared
histopathological findings (staining of endomyocardial biopsy specimens us
ing Heamatoxlin Eosin and polyclonal antibodies), left ventricular function
(Doppler echocardiography) and clinical course (NYHA status}. Patients are
classified into group A (n = 56 recipients) with immunohistochemical TGF-b
eta staining score >7 and group B (n = 96 recipients) with a staining score
<7. Results: Doppler echocardiographic evaluation demonstrated greater imp
airment of left ventricular diastolic function in recipients with higher TG
F-beta staining score. The average mitral deceleration time was 129 +/- 6 m
s for recipients group A compared to 167 +/- 15 ms in group B. While the me
an isovolumic relaxation rime was 65 +/- 8 ms for patients in group A compa
red with 82 +/- 6 ms for recipients in group B (P = 0.0004 and 0.005, respe
ctively). Immunohistochemical scoring correlated inversely with both mitral
deceleration and isovolumic relaxation times (r = -0.74, P = 0.0004 and r
= -0.66, P = 0.004, respectively). Mean NYHA status was 2.7 +/- 1.3 for gro
up A compared to 1.17 +/- 0.4 in group 8 was (P = 0.002). Five years follow
-up revealed persistent left ventricular diastolic impairment for recipient
s with higher immunohistochemical staining score. Mitral deceleration time
and isovolumic relaxation time were 118 +/- 11 and 62 +/- 7 ms for group A
compared to 156 +/- 12 and 80 +/- 5 ms for group B, P = 0.006 and P = 0.01,
respectively. The actuarial development of subsequent coronary artery dise
ase (> 50% stenosis) was 17 and 29% for recipients in group A compared to 4
and 6% for recipients in group B at 3 and 5 years follow-up, respectively
(P = 0.01 and P = 0.005, respectively). Conclusions: TGF-beta expression in
cardiac allografts is associated with impaired graft function and limited
survival. The pathogenesis of diastolic dysfunction may be an aberrant repa
ir process following rejection due to increased TGF-beta expression in tran
splant recipients. (C) 2001 Elsevier Science B.V. All rights reserved.