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Polycystic kidney disease is an inherited kidney disorder that causes abnormal cysts to develop and grow. Studies have shown cannabis reduces kidney damage and helps manage side effects like high blood pressure and pain.
Overview of Polycystic Kidney Disease
Polycystic kidney disease (PKD) is an inherited disorder that causes clusters of cysts to grow in the kidneys. The cysts are filled with fluid and can enlarge the kidneys, replacing much of their normal structure. The abnormal shape leads to chronic kidney disease, which can then over time lead to reduced kidney function and even kidney failure. While most cysts develop in the kidneys, PKD cysts can also develop in the liver and elsewhere throughout the body.
Polycystic kidney disease is caused by genetic defects that are inherited. In rare cases, a mutated gene can be the cause of the disease. There are two types of polycystic kidney disease, each of which is caused by different genetic flaws. The most common type is autosomal dominant polycystic kidney disease (ADPKD), which typically develops between the ages of 30 and 40 and requires only one parent to have the abnormal gene. Autosomal recessive polycystic kidney disease (ARPKD) is a less common type of PKD that typically develops shortly after birth or during childhood. Both parents must have abnormal genes for this type of disease.
PKD commonly causes high blood pressure. Other symptoms caused by the disease include back or side pain, headaches, blood in urine, an increase in abdomen size, frequent urination, kidney stones, urinary tract or kidney infections and kidney failure. Brain aneurysms, heart valve abnormalities, colon problems and chronic pain can also develop from the disease.
There is no cure for polycystic kidney disease, but lifestyle changes and medical treatments can help reduce kidney damage and manage blood pressure. By controlling high blood pressure, the progression of the disease and subsequent kidney damage can be delayed. Medication is often used to manage chronic pain. Additional treatments are necessary if bladder or kidney infections, blood in the urine, kidney failure or aneurysms, develop.
Findings: Effects of Cannabis on Polycystic Kidney Disease
While clinical studies on cannabis’ effect on polycystic kidney disease are lacking, findings in preclinical studies suggest cannabinoids found in cannabis could offer therapeutic benefits for treating kidney disease. Cannabinoids may effectively reduce oxidative stress, inflammation and cell death in the kidney, and improved renal function. These protective effects of cannabinoids are likely due to interaction with the endocannabinoid system’s CB2 receptors, which has been found effective at protecting the kidney from damage by minimizing inflammation and oxidative stress (Mukhopadhyay, et al., 2010).
Cannabis may also limit kidney damage caused by polycystic kidney disease by potentially lowering blood pressure. Studies have found that cannabinoids cause blood vessels to vasodilate, which in turn improves blood flow and reduces blood pressure (Herradon, Martin & Lopez-Miranda, 2007) (Batkai, et al., 2004).
In addition, cannabis may help polycystic kidney disease patients manage their chronic pain levels. Cannabis has been shown to significantly lower both neuropathic and nociceptive pain; even at times managing chronic pain that had previously proven refractory to other treatments (Wallace, et al., 2015). Because of cannabis’ effectiveness, surveys have found that use is prevalent among those experiencing chronic pain (Ware, et al., 2003).
States That Have Approved Medical Marijuana for Polycystic Kidney Disease
Currently, no states have approved medical marijuana specifically for the treatment of polycystic kidney disease. However, in Washington D.C., any condition can be approved for medical marijuana as long as a DC-licensed physician recommends the treatment. In addition, a number of other states will consider allowing medical marijuana to be used for the treatment of polycystic kidney disease with the recommendation from a physician. These states include: California (any debilitating illness where the medical use of marijuana has been recommended by a physician), Connecticut (other medical conditions may be approved by the Department of Consumer Protection), Massachusetts (other conditions as determined in writing by a qualifying patient’s physician), Nevada (other conditions subject to approval), Oregon (other conditions subject to approval), Rhode Island (other conditions subject to approval), and Washington (any “terminal or debilitating condition”).
Also, several states have approved medical marijuana specifically to treat “chronic pain,” a symptom commonly associated with polycystic kidney disease. These states include: Alaska, Arizona, California, Colorado, Delaware, Hawaii, Maine, Maryland, Michigan, Montana, New Mexico, Ohio, Oregon, Pennsylvania, Rhode Island, Vermont and West Virginia. The states of Nevada, New Hampshire, North Dakota, Ohio and Vermont allow medical marijuana to treat “severe pain.” The states of Arkansas, Minnesota, Ohio, Pennsylvania, Washington and West Virginia have approved cannabis for the treatment of “intractable pain.”
Recent Studies on Cannabis’ Effect on Polycystic Kidney Disease
- Bátkai, S., Pacher, P., Osei-Hyiaman, D., Radaeva, S., Liu, J., Harvey-White, J., Offertaler, L., Mackie, K., Rudd, M.A., Bukoski, R.D., and Kunos, G. (2004). Endocannabinoids Acting at Cannabinoid-1 Receptors Regulate Cardiovascular Function in Hypertension. Circulation, 110(14), 1996–2002. Retrieved from https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2756479/.
- Herradon, E., Martin, M.I., and Lopez-Miranda, V. (2007, November). Characterization of the vasorelaxant mechanisms of the endocannabinoid anandamide in rat aorta. British Journal of Pharmacology, 152(5), 699-708. Retrieved from https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2190007/.
- Mukhopadhyay, P., Rajesh, M., Pan, H., Patel, V., Mukhopadhyay, B., Bátkai, S., Gao, B., Hasko, G., and Pacher, P. (2010). Cannabinoid-2 receptor limits inflammation, oxidative/nitrosative stress and cell death in nephropathy. Free Radical Biology & Medicine, 48(3), 457–467. Retrieved from https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2869084/.
- Polycystic kidney disease. (2014, June 14). Mayo Clinic. Retrieved from http://www.mayoclinic.org/diseases-conditions/polycystic-kidney-disease/basics/definition/con-20028831.
- Polycystic Kidney Disease. (2015, August). National Institute of Diabetes and Digestive and Kidney Diseases. Retrieved from http://www.niddk.nih.gov/health-information/health-topics/kidney-disease/polycystic-kidney-disease-pkd/Pages/facts.aspx.
- Stanley, C.P., and O’Sullivan, S.E. (2014, March). Cyclooxygenase metabolism mediates vasorelaxation to 2-arachidonoylglycerol (2-AG) in human mesenteric arteries. Pharmacological Research, 81, 74-82. Retrieved from https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3992009/.
- Ware, M.A., Gamsa, A., Persson, J., and Fitzcharles, M.A. (2002, Summer). Cannabis for chronic pain: case series and implications for clinicians. Pain Research & Management, 7(2), 95-9. Retrieved from http://downloads.hindawi.com/journals/prm/2002/380509.pdf.