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Horm Metab Res 2001; 33(1): 10-15
DOI: 10.1055/s-2001-12619
Original Basic
© Georg Thieme Verlag Stuttgart · New York

Aging and Calcitriol Regulation of IP3 Production in Rat Skeletal Muscle and Intestine

M. M. Facchinetti, A. Russo de Boland
  • Dept. Biologia, Bioquimica & Farmacia, San Juan, 670, Bahia Blanca 8000, Argentina
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Publication History

Publication Date:
31 December 2001 (online)

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We previously reported that calcitriol [1,25(OH)2-vitamin D3] in rat skeletal muscle and duodenum stimulates the hydrolysis of polyphosphoinositides by phospholipase C (PLC), generating the second messengers inositol trisphosphate (IP3) and diacylglycerol (DAG), and that this mechanism is altered in old animals. As previously reported in muscle, we show in the present study that GTPγS (100 μM, 15 s), the non-hydrolyzable analogue of GTP, increased IP3 release from young rats duodenum to the same extent as 1 nM calcitriol (+ 100 %), while GDPβS (100 μM) suppressed hormone-dependent IP3 production. Similarly to calcitriol, GTPγS response was diminished in old rats. Contrary to muscle, pretreatment with Bordetella pertussis toxin did not modify calcitriol-dependent IP3 in duodenum. The antibody, anti-Gαq/11 (1 : 200) and anti-Gαi (1 : 200) blocked calcitriol-dependent IP3 release in muscle from young rats, indicating that the hormone activates an isoform of PLC coupled to the α subunit of Gq/11 and possibly the βγ subunits of Gi. The aged muscle was insensitive to anti Gαi. In rat duodenum the hormone effects were suppressed by anti-Gq/11 both in young and aged animals. In 24-month-old rats, Gq/11 and Gi protein levels were greatly reduced both in muscle and duodenum, suggesting that a deficiency in G protein expression with aging may have important consequences for correct receptor/effector coupling and could explain age-related declines in the function of second messenger systems linked to G-proteins.

Key words:

Calcitriol - IP3 - Rat Muscle - Rat Duodenum - Aging - Signal Transduction

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Dra. A. Russo de Boland

Dept. Biologia, Bioquimica y Farmacia
Universidad Nacional del Sur

San Juan 670
8000 Bahia Blanca
Argentina


Phone: Phone:+ 54 (291) 4595100, ext. 2430

Fax: Fax:+ 54 (291) 4595130

Email: E-mail:aboland@criba.edu.ar