TY - JOUR
T1 - ADP-ribosyl cyclase in rat vascular smooth muscle cells properties and regulation
AU - De Toledo, Frederico G.S.
AU - Cheng, Jingfei
AU - Liang, Mingyu
AU - Chini, Eduardo N.
AU - Dousa, Thomas P.
PY - 2000/6/9
Y1 - 2000/6/9
N2 - We investigated whether ADP-ribosyl cyclase (ADPR-cyclase) in rat vascular smooth muscle cells (VSMCs) has enzymatic properties that differ from the well-characterized CD38-antigen ADPR-cyclase, expressed in HL-60 cells. ADPR-cyclase from VSMCs, but not CD38 ADPR-cyclase from HL-60 cells, was inhibited by gangliosides (10 μmol/L) GT1(B), GD1 and GM3. Preincubation of membranes from CD38 HL-60 cells, but not from VSMCs, with anti-CD38 antibodies increased ADPR-cyclase activity; CD38 antigen was detected both in VSMCs and in HL-60 cells. ADPR-cyclase in VSMC membranes was more sensitive than CD38 HL-60 ADPR-cyclase to inactivation by N- endoglycosidase F and to thermal inactivation at 45°C. The specific activity of ADPR-cyclase in membranes from VSMCs was >20-fold higher than in membranes from CD38 HL-60 cells. Most importantly, VSMC ADPR-cyclase was inhibited by Zn2+ and Cu2+ ions; the inhibition by Zn2+ was dose dependent, noncompetitive, and reversible by EDTA. In contrast, Zn2+ stimulated the activity of CD38 HL-60 ADPR-cyclase and other known types of ADPR-cyclases. Retinoids act either via the nuclear receptor retinoic acid receptor or retinoid X receptor, including all-trans retinoic acid (atRA), and panagonist 9-cis-retinoic acid - upregulated VSMC ADPR-cyclase; the stimulatory effect of atRA was blocked by actinomycin D and cycloheximide. 1,25(OH)2-Vitamin D3 (calciferol) stimulated VSMC ADPR-cyclase dose dependently at subnanomolar concentrations (ED50≃56 pmol/L). Oral administration of atRA to rats resulted in an increase of ADPR-cyclase activity in aorta (≃ + 60%) and, to a lesser degree, in myocardium of left ventricle (+ 18%), but atRA had no effect on ADPR-cyclases in lungs, spleen, intestinal smooth muscle, skeletal muscle, liver, or testis. Administration of 3,5,3'-triiodothyronine (T3) to rats resulted in an increase of ADPR-cyclase activity in aorta (≃ + 89%), but not in liver or brain. We conclude the following: (1) ADPR-cyclase in VSMCs has enzymatic properties distinct from 'classic' CD38 ADPR-cyclase, especially sensitivity to inhibition by Zn2+ and Cu2+; (2) ADPR-cyclase in VSMCs is upregulated by various retinoids, calcitriol, and T3 in vitro; and (3) administration of atRA and T3 increases ADPR-cyclase in aorta in vivo. We suggest that the cADPR signaling system plays an important role in the regulation of VSMC functions in response to steroid superfamily hormones.
AB - We investigated whether ADP-ribosyl cyclase (ADPR-cyclase) in rat vascular smooth muscle cells (VSMCs) has enzymatic properties that differ from the well-characterized CD38-antigen ADPR-cyclase, expressed in HL-60 cells. ADPR-cyclase from VSMCs, but not CD38 ADPR-cyclase from HL-60 cells, was inhibited by gangliosides (10 μmol/L) GT1(B), GD1 and GM3. Preincubation of membranes from CD38 HL-60 cells, but not from VSMCs, with anti-CD38 antibodies increased ADPR-cyclase activity; CD38 antigen was detected both in VSMCs and in HL-60 cells. ADPR-cyclase in VSMC membranes was more sensitive than CD38 HL-60 ADPR-cyclase to inactivation by N- endoglycosidase F and to thermal inactivation at 45°C. The specific activity of ADPR-cyclase in membranes from VSMCs was >20-fold higher than in membranes from CD38 HL-60 cells. Most importantly, VSMC ADPR-cyclase was inhibited by Zn2+ and Cu2+ ions; the inhibition by Zn2+ was dose dependent, noncompetitive, and reversible by EDTA. In contrast, Zn2+ stimulated the activity of CD38 HL-60 ADPR-cyclase and other known types of ADPR-cyclases. Retinoids act either via the nuclear receptor retinoic acid receptor or retinoid X receptor, including all-trans retinoic acid (atRA), and panagonist 9-cis-retinoic acid - upregulated VSMC ADPR-cyclase; the stimulatory effect of atRA was blocked by actinomycin D and cycloheximide. 1,25(OH)2-Vitamin D3 (calciferol) stimulated VSMC ADPR-cyclase dose dependently at subnanomolar concentrations (ED50≃56 pmol/L). Oral administration of atRA to rats resulted in an increase of ADPR-cyclase activity in aorta (≃ + 60%) and, to a lesser degree, in myocardium of left ventricle (+ 18%), but atRA had no effect on ADPR-cyclases in lungs, spleen, intestinal smooth muscle, skeletal muscle, liver, or testis. Administration of 3,5,3'-triiodothyronine (T3) to rats resulted in an increase of ADPR-cyclase activity in aorta (≃ + 89%), but not in liver or brain. We conclude the following: (1) ADPR-cyclase in VSMCs has enzymatic properties distinct from 'classic' CD38 ADPR-cyclase, especially sensitivity to inhibition by Zn2+ and Cu2+; (2) ADPR-cyclase in VSMCs is upregulated by various retinoids, calcitriol, and T3 in vitro; and (3) administration of atRA and T3 increases ADPR-cyclase in aorta in vivo. We suggest that the cADPR signaling system plays an important role in the regulation of VSMC functions in response to steroid superfamily hormones.
KW - ADP-ribose
KW - Antibodies
KW - Calciferols
KW - Retinoids
KW - Vascular smooth muscle cells
UR - http://www.scopus.com/inward/record.url?scp=0034625533&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0034625533&partnerID=8YFLogxK
U2 - 10.1161/01.RES.86.11.1153
DO - 10.1161/01.RES.86.11.1153
M3 - Article
C2 - 10850967
AN - SCOPUS:0034625533
SN - 0009-7330
VL - 86
SP - 1153
EP - 1159
JO - Circulation research
JF - Circulation research
IS - 11
ER -