Identification and characterization of nuclear retinoic acid-binding activity in human myeloblastic leukemia HL-60 cells.

Abstract:

:Specific [3H]retinoic acid (RA)-binding sites in nuclear and cytosolic extracts prepared from human myeloblastic leukemia HL-60 cells have been detected by sucrose density gradient sedimentation and size-exclusion high-performance liquid chromatography (HPLC) analyses. This RA-binding activity migrated as a single peak with an apparent molecular weight of 50,000 and greater than 95% of the total binding activity was associated with the nuclear extract. Nuclear extracts prepared from COS-1 cells transfected with an expression vector for the nuclear RA receptors RAR alpha or RAR beta were enriched (20- to 100-fold) with a RA-binding activity that coeluted by size-exclusion HPLC with the putative RAR from HL-60 cells. The HL-60 nuclear receptor exhibited high-affinity binding of RA and its benzoic acid analogs Ch55, Ch30, Ro 13-7410, and SRI 6409-40 and low-affinity binding of retinol, Ro 8-8717, and SRI 5442-60, correlating well with the biological activity of these compounds in HL-60 cells. Saturation binding and Scatchard plot analyses of the binding of RA to the nuclear HL-60 receptor yielded an apparent dissociation constant of approximately 0.46 nM and 1400 +/- 100 receptor sites per cell. Northern blot analyses of poly(A)+ RNA with cDNA probes specific for RAR alpha and RAR beta indicated that HL-60 cells contain predominantly transcripts encoded by the RAR alpha gene. Our results suggest that the observed nuclear RA-binding activity in HL-60 cells might mediate the action of RA in these cells.

authors

Nervi C,Grippo JF,Sherman MI,George MD,Jetten AM

doi

10.1073/pnas.86.15.5854

subject

Has Abstract

pub_date

1989-08-01 00:00:00

pages

5854-8

issue

15

eissn

0027-8424

issn

1091-6490

journal_volume

86

pub_type

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