Microglia- A Promising Target for Treating Neuropathic Pain

Modulation of microglia can attenuate neuropathic pain symptoms and enhance morphine effectiveness.

Abstract

Microglia play a crucial role in the maintenance of neuronal homeostasis in the central nervous system, and microglia production of immune factors is believed to play an important role in nociceptive transmission. There is increasing evidence that uncontrolled activation of microglial cells under neuropathic pain conditions induces the release of proinflammatory cytokines (interleukin – IL-1beta, IL-6, tumor necrosis factor – TNF-alpha), complement components (C1q, C3, C4, C5, C5a) and other substances that facilitate pain transmission. Additionally, microglia activation can lead to altered activity of opioid systems and neuropathic pain is characterized by resistance to morphine. Pharmacological attenuation of glial activation represents a novel approach for controlling neuropathic pain. It has been found that propentofylline, pentoxifylline, fluorocitrate and minocycline decrease microglial activation and inhibit proinflammatory cytokines, thereby suppressing the development of neuropathic pain. The results of many studies support the idea that modulation of glial and neuroimmune activation may be a potential therapeutic mechanism for enhancement of morphine analgesia. Researchers and pharmacological companies have embarked on a new approach to the control of microglial activity, which is to search for substances that activate anti-inflammatory cytokines like IL-10. IL-10 is very interesting since it reduces allodynia and hyperalgesia by suppressing the production and activity of TNF-alpha, IL-1beta and IL-6. Some glial inhibitors, which are safe and clinically well tolerated, are potential useful agents for treatment of neuropathic pain and for the prevention of tolerance to morphine analgesia. Targeting glial activation is a clinically promising method for treatment of neuropathic pain.

Microglia: a promising target for treating neuropathic and postoperative pain, and morphine tolerance.

Source

Department of Anesthesiology, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA, USA.

Abstract

Management of chronic pain, such as nerve-injury-induced neuropathic pain associated with diabetic neuropathy, viral infection, and cancer, is a real clinical challenge. Major surgeries, such as breast and thoracic surgery, leg amputation, and coronary artery bypass surgery, also lead to chronic pain in 10-50% of individuals after acute postoperative pain, partly due to surgery-induced nerve injury. Current treatments mainly focus on blocking neurotransmission in the pain pathway and have only resulted in limited success. Ironically, chronic opioid exposure might lead to paradoxical pain. Development of effective therapeutic strategies requires a better understanding of cellular mechanisms underlying the pathogenesis of neuropathic pain. Progress in pain research points to an important role of microglial cells in the development of chronic pain. Spinal cord microglia are strongly activated after nerve injury, surgical incision, and chronic opioid exposure. Increasing evidence suggests that, under all these conditions, the activated microglia not only exhibit increased expression of microglial markers CD 11 b and Iba 1, but also display elevated phosphorylation of p38 mitogen-activated protein kinase. Inhibition of spinal cord p38 has been shown to attenuate neuropathic and postoperative pain, as well as morphine-induced antinociceptive tolerance. Activation of p38 in spinal microglia results in increased synthesis and release of the neurotrophin brain-derived neurotrophic factor and the proinflammatory cytokines interleukin-1β, interleukin-6, and tumor necrosis factor-α. These microglia-released mediators can powerfully modulate spinal cord synaptic transmission, leading to increased excitability of dorsal horn neurons, that is, central sensitization, partly via suppressing inhibitory synaptic transmission. Here, we review studies that support the pronociceptive role of microglia in conditions of neuropathic and postoperative pain and opioid tolerance. We conclude that targeting microglial signaling might lead to more effective treatments for devastating chronic pain after diabetic neuropathy, viral infection, cancer, and major surgeries, partly via improving the analgesic efficacy of opioids.

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We need community help to become an Exhibitor at the Sacramento’s Convoy of Hope

Convoy of Hope

Sponsor/ Donation Request

In-Kind and Cash donations are Tax deductible

For Immediate Release: June 26, 2012

RE: Exhibitor at the Sacramento’s Convoy of Hope event

The Power of Pain Foundation (POPF) is hoping to become an exhibitor at the Sacramento’s Convoy of Hope event. The event will take place on September 15, 2012 at the Cal Expo. The Power of Pain Foundation is a nonprofit 501(C)(3) charity. All donations are tax-deductible. We really need your help! We must raise $2,000. We will be able to reach 20,000+ people who attend the event and distribute awareness information, provide resources to the community, host a balloon launch, and answer questions. We need donations now to raise funds to participate in this great event during September 2012 – National Pain Awareness month.

Our goal at the Convoy of Hope event is to inform the public that Reflex Sympathetic Dystrophy and other neuropathy conditions do exist, there is hope and help.

Please help us attend this event and reach Californians with this important information and resources. Donors of $25 or more will have their names listed on the Power of Pain Foundations Website with over 1,000,000 page views a year and our social media pages (Facebook, Twitter, Linked In), and our newsletter and email blasts, reaching over 8,000 direct people.

Thank you for your consideration.

Twinkle VanFleet

POPF California Ambassador

Media Contact Information:

Twinkle VanFleet

CAAmbassador@powerofpain.org

twinkle@crpsadvisory.com

916-850-0RSD (0773)

More on the Power of Pain Foundation

The Power of Pain Foundation (POPF) provides community based support services that address the needs of chronic pain patients with Neuropathy conditions such as RSD/CRPS, Post Cancer Pain, Lyme, MS, Fibromyalgia, Diabetic Neuropathy, and many more. Accordingly, beneficiaries include patients who are economically and socially affected by these invisible diseases. Whether you have Neuropathy pain or are a caregiver, family member, or friend of someone diagnosed, we help you face the challenges and life changes of chronic nerve pain, head on. The Power of Pain Foundation’s federal ID number is 65-1298571.

The POPF works throughout the United States to promote awareness for Neuropathy conditions. One such condition is Reflex Sympathetic Dystrophy, also known as RSD/CRPS, and Causalgia. More than 10 million people have been diagnosed with RSD in the United States alone. RSD has a score of 42 out of 50 on the McGill Pain Index, the highest of all medical conditions known to man. There is no cure to date.

More on the Sacramento Convoy of Hope event

“The Sacramento Convoy of Hope is a collaborative effort between dozens of local churches, businesses, social service organizations, local government and Convoy of Hope. This all-volunteer event mobilizes hundreds of area residents to serve and make a difference in their community. Strong participation by local businesses, churches, community agencies, and individuals is crucial to the success of this event. Bring your family and enjoy free services and entertainment, with more than 100,000 pounds of free groceries. There will be a health fair, job fair, free medical and dental screenings with local doctors, medical professionals and dentists, kid’s zone, free haircuts, dozens of free carnival games, inflatable’s and live entertainment. Also, free family portraits courtesy of local photographers, community services, dozens of local community service organizations and free BBQ lunch.”

213 Nottingham Drive, Colonial Heights, VA 23834, 804-657-PAIN(7246)
38556 N. Dave Street, Queen Creek, AZ 85240, 480-882-1342
A 501 (c) (3) not for profit organization – 65-1298571
www.powerofpain.org

Checks and Money orders from around the world can be sent to the address above. Please add Convoy of Hope to the memo. Or go to our website at: http://powerofpain.org/donate/ and choose your option.

Paypal account ID- donate@powerofpain.org

All donations go right back into serving you and the Convoy of Hope itself.

I can accept cash in person in Sacramento only. A receipt with both our signatures and information will be required to maintain proper records for the Power of Pain Foundation.

In addition, the Power of Pain Foundation is Hosting an Online Auction Fundraiser to help us become an exhibitor and the Convoy of Hope. We must raise funds to complete the mission of raising awareness and support for the conditions listed above.

We’re also seeking donations Sacramento area businesses who would be kind enough to offer us gift certificates, vacations, airline tickets, accessories, jewelry, hair salon certificates, spa’s, handmade items, etc for our auction.

We’re also seeking area residents who might have items to donate.

Again all items are tax-deductible.

Sponsors include: (updated daily)
Business Donors

Absolute Investigations

Individual Donors
Dani Meyers
VanFleet Family
Taylor Family

Convoy of Hope Fundraiser 2012

Facebook events Convoy of Hope Online Auction Fundraiser 2012

We would be grateful if you joined our event page and attended the auction.

Feel welcome to add me on Facebook- www.facebook.com/rsdcrpsfire

We look forward to serving you!

Thank you!

~Twinkle V.