PMID- 8260894 OWN - NLM STAT- MEDLINE DCOM- 19940125 LR - 20190116 IS - 1042-8194 (Print) IS - 1026-8022 (Linking) VI - 11 IP - 3-4 DP - 1993 Oct TI - L-myc and N-myc in hematopoietic malignancies. PG - 197-205 AB - The myc proto-oncogenes encode nuclear DNA-binding phosphoproteins which regulate cell proliferation and differentiation. The c-myc gene is implicated in hematopoietic malignancies on the basis of its frequent deregulation in naturally occurring leukemias and lymphomas. Recent evidence suggests that also the N-myc and L-myc genes may have a role in normal and malignant hematopoiesis. N-myc and to a certain degree L-myc can substitute for c-myc in transformation assays in vitro, and their overexpression can block the differentiation of leukemia cell lines. Immunoglobulin heavy chain enhancer (IgH) -driven overexpression of N-myc or L-myc genes cause lymphatic and myeloid tumors, respectively, in transgenic mice. Furthermore, the L-myc and N-myc genes are expressed in several human leukemias and leukemia cell lines, L-myc predominantly in myeloid and N-myc both in myeloid and in some lymphoid leukemias. All N/L-myc positive leukemias and leukemia cell lines coexpress the c-myc gene, thus exemplifying a lack of negative cross-regulation between the different myc genes in leukemia cells. Taken together, these data suggest that L-myc and N-myc may participate in the growth regulation of hematopoietic cells. FAU - Hirvonen, H AU - Hirvonen H AD - Department of Medical Biochemistry, University of Turku, Finland. FAU - Hukkanen, V AU - Hukkanen V FAU - Salmi, T T AU - Salmi TT FAU - Pelliniemi, T T AU - Pelliniemi TT FAU - Alitalo, R AU - Alitalo R LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PT - Review PL - United States TA - Leuk Lymphoma JT - Leukemia & lymphoma JID - 9007422 RN - 0 (Proto-Oncogene Proteins c-myc) RN - 0 (RNA, Messenger) SB - IM GS - L-myc GS - N-myc MH - Animals MH - Gene Expression Regulation, Neoplastic MH - *Genes, myc MH - Humans MH - Leukemia/*genetics MH - Lymphoma/*genetics MH - Proto-Oncogene Proteins c-myc/physiology MH - RNA, Messenger/metabolism RF - 100 EDAT- 1993/10/01 00:00 MHDA- 1993/10/01 00:01 CRDT- 1993/10/01 00:00 PHST- 1993/10/01 00:00 [pubmed] PHST- 1993/10/01 00:01 [medline] PHST- 1993/10/01 00:00 [entrez] AID - 10.3109/10428199309086996 [doi] PST - ppublish SO - Leuk Lymphoma. 1993 Oct;11(3-4):197-205. doi: 10.3109/10428199309086996.