Given the task definition and input, reply with output. Given a passage with a context and an answer, construct a question on the basis of the information present in the passage. Construct the question in such a way that (i) it is unambiguous, (ii) it is answerable from the passage, (iii) its answer is unique (iv) it answer uses text phrases from the passage. Avoid creating questions that (i) can't be answered correctly without actually understanding the passage and (ii) uses the same words or phrases given in the passage.

Context: Rac1 upregulation has been implicated in salt-sensitive hypertension as a modulator of mineralocorticoid receptor (MR) activity. Rac1 could affect the expression of oxidative stress markers, such as hemoxigenase-1 (HO-1) or nuclear factor-B (NF-B), and the expression of neutrophil gelatinase-associated lipocalin (NGAL), a cytokine upregulated upon MR activation.', 'We evaluated RAC1 expression in relation of high salt intake and association with MR, NGAL, HO-1, and NF-B expression, mineralo- and glucocorticoids levels, and inflammatory parameters.', 'We studied 147 adult subjects. A food survey identified the dietary sodium (Na) intake. RAC1 expression was considered high or low according to the value found in normotensive subjects with low salt intake. We determined the gene expression of RAC1, MR, NGAL, HO-1, NF-B, and 18S, isolated from peripheral leukocytes. We measured aldosterone, cortisol, sodium, potassium excretion, metalloproteinase (MMP9 y MMP2), and C-reactive protein.', 'We identified 126 subjects with high Na-intake, 18 subjects had high, and 108 low-RAC1 expression. The subjects with high-RAC1 expression showed a significant increase in MR (P = 0.0002), NGAL (P < 0.0001) HO-1 (P = 0.0004), and NF-B (P < 0.0001) gene expression. We demonstrated an association between RAC1 expression and MR (R sp 0.64; P < 0.0001), NGAL (R sp 0.48; P < 0.0001), HO-1 (R sp 0.53; P < 0.0001), and NF-B (R sp0.52; P < 0.0001). We did not identify any association between RAC1 and clinical or biochemical variables.
Answer: RAC1 expression was associated with an increase in MR, NGAL, NF-B, and HO-1 expression, suggesting that RAC1 could be a mediator of cardiovascular damage induced by sodium, and may also useful to identify subjects with different responses to salt intake.
Are the Expression of RAC1 and Mineralocorticoid Pathway-Dependent Genes Associated With Different Responses to Salt Intake?