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Low natural-killer-cell activity in familial melanoma patients and their relatives
Abstract:
Patients with melanoma who had one or more close relatives with melanoma were studied for their natural-killer-cell (NK) activity against cultured melanoma cells and Chang cells. A high proportion of the patients and their relatives were found to have low NK activity against these target cells. In most of the patients this could not be attributed to general depression of their immune function, since B- and T-cell numbers and the mitogenic response to PHA were within normal limits. The levels of NK activity of the patients and their relatives were found to be significantly correlated, suggesting that the NK activity in these families may have been genetically (or environmentally) determined. Several genetic markers were examined in the patients and their relatives for association with the disease state and NK activity. No association with HLA antigens or ABO blood groups was detected, but there was a low incidence of the Rhesus negative phenotype in the patients (the Rh phenotype had previously been associated with high NK activity). The present results indicate that NK activity has a familial association in families with a high incidence of melanoma, and raise the question whether low NK activity may be one of the predisposing factors in the development of familial melanoma.
Insights
Patients with familial melanoma and their relatives often exhibit low natural killer (NK) cell activity. This familial association suggests a potential genetic or environmental link, possibly predisposing individuals to melanoma development.
Area of Science:
- Immunology
- Genetics
- Oncology
Background:
- Melanoma exhibits familial clustering, suggesting genetic or environmental predispositions.
- Natural killer (NK) cell activity plays a role in immune surveillance against tumors.
- Previous research has linked certain genetic markers to immune function and cancer risk.
Purpose of the Study:
- To investigate natural killer (NK) cell activity in patients with familial melanoma and their relatives.
- To explore potential genetic or environmental factors influencing NK activity within these families.
- To determine if low NK activity is associated with an increased risk of developing familial melanoma.
Main Methods:
- Assessed NK cell activity against melanoma and Chang cells in melanoma patients and their relatives.
- Evaluated general immune function by measuring B- and T-cell counts and phytohemagglutinin (PHA) response.
- Examined associations between NK activity, disease status, and genetic markers (HLA, ABO, Rh phenotypes).
Main Results:
- A significant proportion of melanoma patients and their relatives displayed reduced NK cell activity.
- Normal B- and T-cell numbers and PHA responses indicated no generalized immune suppression in most patients.
- NK activity levels were significantly correlated within families, suggesting a familial determination (genetic or environmental).
- A low incidence of Rhesus negative (Rh-) phenotype was observed in patients, contrasting with previous findings of high NK activity in Rh- individuals.
Conclusions:
- Low natural killer (NK) cell activity is a familial trait in melanoma-prone families.
- This familial association suggests NK activity may be genetically or environmentally influenced.
- Reduced NK cell activity could be a predisposing factor for the development of familial melanoma.