JUNIPER PUBLISHERS-CURRENT RESEARCH IN DIABETES &
OBESITY JOURNAL
PHARMACOLOGICAL
TREATMENT OF A PATIENT WITH LIFE-LONG OBESITY AND HETEROZYGOUS COMPLETE
LOSS-OF-FUNCTION MELANOCORTIN 4 RECEPTOR MUTATION 
Authored
by Emily Cooper
The heterozygous melanocortin 4 receptor (MC4R) 
mutation is considered a primary factor in 2% to 4% of patients with 
obesity. Pharmacological treatment, including long-term, is emerging as a
 new standard for obese patients; however, there are no published 
reports on treatment outcomes in obese patients with documented MC4R 
mutations. Weight loss occurs with diet restriction or bariatric surgery
 and is often followed by a weight regain phase in patients with or 
without the MC4R mutation, indicating the need for an alternative 
approach to weight loss such as pharmacological treatment.
This case study describes a 48-year-old woman who 
experienced lifelong obesity and a history of dieting that started in 
childhood with episodes of weight loss followed by weight gain. Her 
highest weight was 320 pounds in 2007. Her family’s medical history 
included diabetes, prediabetes, and obesity. She presented to the clinic
 in January 2013 weighing 286.2 pounds with at-risk cardiovascular and 
cardiometabolic profiles. Treatment was initiated to control insulin 
resistance and metabolic syndrome, lower cholesterol and triglycerides, 
and manage hypothyroidism. Weight-loss treatment also began with a 
combination of bupropion and naltrexone or carbonic anhydrase inhibitors
 and naltrexone. Her on-treatment nutrition included eating from all 
food groups without counting calories or excessive exercise. In late 
2014, she tested positive for a heterozygous complete loss-of-function 
MC4R gene mutation and weighed 213 pounds. The patient’s lowest weight 
while on treatment was 166 pounds in August 2015. By November 2016, 
after experiencing partial weight regain, her weight had been stable for
 6 months at approximately 198 pounds,a 30% reduction in weight from 
2013.
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