PMID- 10567312 OWN - NLM STAT- MEDLINE DCOM- 19991215 LR - 20231024 IS - 0009-7322 (Print) IS - 0009-7322 (Linking) VI - 100 IP - 19 Suppl DP - 1999 Nov 9 TI - Autologous transplantation of bone marrow cells improves damaged heart function. PG - II247-56 AB - BACKGROUND: Autologous bone marrow cells (BMCs) transplanted into ventricular scar tissue may differentiate into cardiomyocytes and restore myocardial function. This study evaluated cardiomyogenic differentiation of BMCs, their survival in myocardial scar tissue, and the effect of the implanted cells on heart function. IN VITRO STUDIES: BMCs from adult rats were cultured in cell culture medium (control) and medium with 5-azacytidine (5-aza, 10 micromol/L), TGFbeta1 (10 ng/mL), or insulin (1 nmol/L) (n=6, each group). Only BMCs cultured with 5-aza formed myotubules which stained positively for troponin I and myosin heavy chain. In vivo studies: a cryoinjury-derived scar was formed in the left ventricular free wall. At 3 weeks after injury, fresh BMCs (n=9), cultured BMCs (n=9), 5-aza-induced BMCs (n=12), and medium (control, n=12) were autologously transplanted into the scar. Heart function was measured at 8 weeks after myocardial injury. Cardiac-like muscle cells which stained positively for myosin heavy chain and troponin I were observed in the scar tissue of the 3 groups of BMC transplanted hearts. Only the 5-aza-treated BMC transplanted hearts had systolic and developed pressures which were higher (P<0.05) than that of the control hearts. All transplanted BMCs induced angiogenesis in the scar. CONCLUSIONS: Transplantation of BMCs induced angiogenesis. BMCs cultured with 5-aza differentiated into cardiac-like muscle cells in culture and in vivo in ventricular scar tissue and improved myocardial function. FAU - Tomita, S AU - Tomita S AD - Department of Surgery, Division of Cardiovascular Surgery, The Toronto Hospital-General Division, University of Toronto, Ontario, Canada. FAU - Li, R K AU - Li RK FAU - Weisel, R D AU - Weisel RD FAU - Mickle, D A AU - Mickle DA FAU - Kim, E J AU - Kim EJ FAU - Sakai, T AU - Sakai T FAU - Jia, Z Q AU - Jia ZQ LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - United States TA - Circulation JT - Circulation JID - 0147763 RN - 0 (Troponin I) RN - EC 3.6.4.1 (Myosin Heavy Chains) SB - IM MH - Animals MH - *Hematopoietic Stem Cell Transplantation MH - Myocardial Contraction MH - Myocardial Infarction/*therapy MH - Myosin Heavy Chains MH - Rats MH - Rats, Sprague-Dawley MH - Transplantation, Autologous MH - Troponin I EDAT- 1999/11/24 00:00 MHDA- 1999/11/24 00:01 CRDT- 1999/11/24 00:00 PHST- 1999/11/24 00:00 [pubmed] PHST- 1999/11/24 00:01 [medline] PHST- 1999/11/24 00:00 [entrez] AID - 10.1161/01.cir.100.suppl_2.ii-247 [doi] PST - ppublish SO - Circulation. 1999 Nov 9;100(19 Suppl):II247-56. doi: 10.1161/01.cir.100.suppl_2.ii-247.