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Solanum nigrum Linne polysaccharide (SNLP), an active ingredient from Solanum nigrum Linne, has been proposed to inhibit tumor growth and display immunomodulatory activity. However, the molecular mechanism related to immune regulation remains unclear. In the present study, a homogeneous polysaccharide (SNLP-1) was extracted, the immune effects and the underlying molecular mechanisms were investigated. The immunomodulatory activity assay in vitro showed that SNLP-1 promoted the release of NO and TNF-α and IL-6 secretion in macrophages. I