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. 1997 Aug;89(8):523–527.

Hyperinsulinemia and acanthosis nigricans in African Americans.

C A Stuart 1, C R Gilkison 1, B S Keenan 1, M Nagamani 1
PMCID: PMC2568117  PMID: 9264219

Abstract

Compared with the US white, non-Hispanic population, the African-American population has a nearly two-fold higher prevalence of noninsulin-dependent diabetes mellitus (NIDDM). Obesity, which usually precedes NIDDM, is associated with the skin lesion acanthosis nigricans in African Americans. This study was undertaken to determine what the relationship of acanthosis nigricans was to hyperinsulinemia, a major risk factor for NIDDM. Eighty-nine African-American subjects with acanthosis nigricans and 25 others without the skin lesion were evaluated using oral glucose tolerance testing and responsiveness to insulin. Noninsulin-dependent diabetes mellitus was present in 19 of the subjects with acanthosis nigricans. The prevalence of NIDDM in this group increased with increasing age, reaching 50% among those in their 40s. Fasting plasma insulin concentration was in direct proportion to the severity of the acanthosis nigricans involvement of the neck. These data suggest that among African Americans, this skin lesion is a marker for hyperinsulinemia and insulin resistance. Furthermore, the presence of acanthosis nigricans identifies a subset with a much higher prevalence of NIDDM than is present in African Americans in the general population.

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Selected References

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