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Researchers Say Answer to Chronic Pain May Start With B-Vitamins

  [ 427 votes ]   [ Discuss This Article ]
www.ProHealth.com • April 28, 2003


New Findings Reveal That This Treatment Could Be Highly Effective In Alleviating Pain Caused By Injury to the Nervous System

DALLAS, April 14 /PRNewswire/ -- Chronic pain affects some 86 million
Americans a year and accounts for about $90 billion lost annually due to sick time, reduced productivity, and direct medical and other benefit costs. Many who suffer from chronic pain are told to learn to "live with it." Now new research indicates that relief may be found at the vitamin counter in your neighborhood grocery story.

Researchers in the Research Institute at Parker College of Chiropractic in Dallas, Texas, say they may have found an effective treatment for various painful conditions caused by injuries to the nervous system. Tests using B-vitamins, such as B1, B6, and B12, are showing significant results in blocking pain in laboratory rats.

Xuejun Song MD, PhD, Associate Professor and Associate Director of Basic Science Research, and Zhengbei Wang, MD, Postdoctoral Associate, both from the Parker Research Institute, are presenting their findings this week at the Experimental Biology meeting in San Diego (April 11-15, 2003) held by The American Physiological Society (APS) and the other five prestigious national research organizations. APS has identified the Parker team's study--one of thousands submitted from worldwide scientists--as one of the twelve that may hold potential interest for the public.

Dr. Song heads the research team, which conducted tests ranging 2-12 weeks to examine the short- and long-term effects of B-vitamins on rats that had been put through invasive operative procedures. The team's results found that both severity and duration of pain in these rats were significantly reduced depending on the dosage.

"These studies strongly support and broaden the knowledge and clinical use of B-vitamins in aiding in treatment of chronic pain due to the nerve injury or spinal cord trauma and/or other injuries and diseases of the nervous systems," noted Song.

Xuejun Song, MD, PhD

Dr. Song is Associate Professor, Associate Director of Basic Science
Research, Parker College Research Institute. He received his MD in medicine from Xuzhou Medical College, P.R. China, and his PhD in Neurobiology from the Shanghai Brain Research Institute, Chinese Academy of Sciences. Dr. Song conducted his post-doctorate studies in anesthesiology and neurobiology at Yale University School of Medicine.

In his 17 year medical career, Dr. Song has been an instructor in the
Department of Integrative Biology, Pharmacology and Physiology at The
University of Texas-Houston Medical Center and a Senior Scientist, Associate Professor, Head of Laboratory of Electrophysiology at Parker College before taking on his present role as a director at Parker College's Research Institute.

Dr. Song is an active member of many academic organizations including the Society for Neuroscience, the American Society of Physiology, the
International Association for Study of Pain, the International Brain Research Organization, and the American Advanced Association of Sciences.

About Parker College of Chiropractic

Parker College of Chiropractic, located in Dallas, is one of the country's leading educators of healthcare professionals with an international student enrollment. Founded in 1982, this private, non-profit educational institution prepares men and women to become Doctors of Chiropractic. Parker College is accredited by both the specialized professional accreditation agency, the Commission on Accreditation (C.O.A.) and the regional accreditation agency, the Commission on Colleges of the Southern Association of Colleges and Schools
(S.A.C.S.). For additional information about Parker College of Chiropractic, visit the college's website at http://www.parkercc.edu .

About the American Physiological Society

The American Physiological Society (APS) is one of the world's most
prestigious organizations for physiological scientists. These researchers specialize in understanding the processes and functions underlying human health and disease. Founded in 1887 the Bethesda, MD-based Society has more than 10,000 members and publishes 3,800 articles in its 14 peer-reviewed journals each year.

The Study in Detail

To provide experimental evidence that supports clinical use of the
B-vitamins in aiding in the treatment of chronic pain especially neuropathic pain due to primary sensory neuron injury, the present study examined antinociceptive effect of vitamin B1, B6 and B12 using the neuropathic pain model of chronic compression of DRG (CCD, Song et al. J Neurophysiol 1999, 82: 3359-3370), and the possible contributions of cGMP-PKG signaling pathway to B1 induced antinociception.

The authors of "Antinociceptive Effects of Thiamin, Pyridoxine and Cyanocobalamin in Rats with Primary Sensory Neuron injury" and
"Activation of cGMP-PKG Signaling Pathway Mediates Thiamin Induced-Inhibition of Thermal Hyperalgesia in Rats with Primary Sensory Neuron Injury" are Xue-Jun Song MD, PhD, Associate Professor and Associate Director of Basic Science Research Department of Neurobiology, and Zheng-Bei Wang, MD, both from the Parker Research Institute, Dallas, TX. They are presenting their findings at the American Physiological Society conference, Experimental Biology 2003, being held April 11-15, 2003, at the San Diego Conference Center, San Diego, CA.

Methodology

Experiments were performed on adult, male Sprague-Dawley rats weighing
200-250 g. CCD was produced by surgically implanting stainless steel rods unilaterally into the intervertebral foramen at L4 and L5 as we previously described. In brief, the rats were anesthetized with sodium pentobarbital (40mg/kg, i.p.), the paraspinal muscles were separated from the mammillary and transverse processes and the intervertebral foramina of L4 and L5 exposed.

A stainless steel L-shaped rod, 4 mm in length and 0.6 mm in diameter, was implanted into each foramen, one at L4 and the other at L5. Each insertion was guided by the mammillary process and transverse process. As the rod was moved over the ganglion, the ipsilateral hind leg muscles typically exhibited one or two slight twitches. After surgery, the muscle and skin layers were
sutured. An oral antibiotic, Augmentin, was administered after surgery in the drinking water for each rat (7.52 g in 500 ml) for seven days.

The presence of thermal hyperalgesia was determined by measuring foot
withdrawal latency to heat stimulation of surface of hindpaw. The rats were tested on each of 2 successive days prior to surgery.

Postoperative tests were conducted 1, 3, 5, 7, 10, 14 days after surgery and then once weekly for ~10 weeks in some rats for examining the long-term effects of B vitamins. For examining short-term effects, tests were conducted for up to 14 days and additional tests 2, 6, 12, 24 and 36 hours after injection of B vitamins on the third day after surgery.

The rats in different groups each received one of the following treatments via i.p. or i.t. I.p. treatments (0.1 ml/100g): (1) saline (0.9% NaCl); (2) B1 (5, 10 and 33 mg/kg, respectively); (3) B6 (5, 10 and 33 mg/kg, respectively); (4) B12 (0.05, 0.2 and 0.5 mg/kg); (5) complex B vitamins (CBV) (B1+ B6 + B12 at different doses); (6) CBV for 7 consecutive days aftersurgery. I.t. treatments (20 *l): (1) saline; (2) B1 (33, 66 and 132 *g); (3) PKG inhibitor Rp-8pCPT-cGMPS (0.1 and 1 *M) +B1 (66 *g); (4) guanylylcyclase inhibitor ODQ (0.02 and 0.2 *M) + B1; (5) cGMP analog 8Br-cGMP (0.1 and 1 *M); (6) PKG activator SP-cGMP (0.1 and 1 *M); (7) Rp-8pCPT-cGMPS + 8Br-cGMP; (8) Rp-8pCPT-cGMPS + SP-cGMP; (9) B1 66 *g for 7 consecutive days after surgery. Additional rats were used as sham or unoperated control.

Results

B1, B6, B12 and their combination, i.p. or i.t., significantly inhibited thermal hyperalgesia (pain) evidenced by reversal of the shortened latency of foot withdrawal to noxious heat stimulation ipsilateral to CCD. This inhibition was in dose-dependent manner. Hyperalgesia was inhibited about 20-100 percent at 2, 6 and 12 hr, and recovered at 24 or 36 hr test dependent on different doses.

Repetitive application of CBV for seven days produced long-term inhibitory effects on thermal hyperalgesia. The extreme sensitivity to stimuli disappeared four to five weeks after injury in rats with CBV treatment. In contrast, hyperalgesia lasted for eight to ten weeks in rats with saline or without any treatment. In addition, we found that combination of threshold doses of individual of the vitamins produced a synergetic inhibitory effect on thermal hyperalgesia.

B1, i.t., induced-inhibition of hyperalgesia was reversed by inhibitors of cGMP-PKG signaling pathway ODQ (guanylyl cyclase inhibitor) and Rp-8pCPT-cGMP (PKG inhibitor). cGMP analog 8Br-cGMP and PKG activator SP-cGMP inhibited thermal hyperalgesia, respectively. Such inhibition is similar to that produced by B1. Rp-8pCPT-cGMP again reversed 8Br-cGMP and SP-cGMP induced- inhibition of thermal hyperalgesia. B1 and the activators and inhibitors of cGMP-PKG pathways did not alter the foot withdrawal latency in unoperated control rats.

Summary

The present studies demonstrate that spinal application as well as
intraperitoneal injection of vitamin B1, B6, B12 their combination can produce short- and long-term inhibition of hyperalgesia following chronic compression dorsal root ganglion neurons produced by artificial intervertebral foramen stenosis. Both severity and duration of hyperalgesia are significantly reduced. These results strongly support clinical use of B-vitamins in aiding in treatment of chronic pain and/or other diseases due to similar injuries to the nervous system.


SOURCE Parker College of Chiropractic

Web Site: http://www.parkercc.edu



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