TY - JOUR
T1 - Effects of age, gender, ethnicity, diurnal variation and exercise on circulating levels of matrix metalloproteinases (MMP)-2 and-9, and their inhibitors, tissue inhibitors of matrix metalloproteinases (TIMP)-1 and-2
AU - Tayebjee, Muzahir
AU - Lip, Gregory
AU - Blann, Andrew
AU - Macfadyen, Robert
PY - 2005/1/1
Y1 - 2005/1/1
N2 - Background: Circulating metalloproteinases (MMP) and their inhibitors (TIMP) are indices of vascular and cardiac tissue matrix turnover. However, the temporal changes and relationship of these parameters to age, gender, ethnicity and exercise have been poorly defined, even in healthy individuals. We therefore studied these aspects on plasma levels of MMP-2 and -9 and TIMP-1 and -2, as the major metalloproteinases (and their inhibitors) implicated in pathophysiology of vascular disease. Methods: Venous citrated blood was collected from 93 normal healthy volunteers from four ethnic groups (Afro-Caribbean, South Asian, Caucasian and Far Eastern) for a cross-sectional study. In addition, 20 separate healthy volunteers were studied during supine rest, before and immediately following peak treadmill stress using a Bruce protocol. MMP-2 and -9 and TIMP-1 and -2 were all measured by ELISA. Results: There was a categorical distribution of MMP-2 concentration with individual subjects showing high levels, yet others being undetectable, although these changes were unrelated to age, gender or ethnicity. TIMP-1 and -2 showed a modest negative correlation with age (r=-0.251, p=0.015; r=-0.254, p=0.014). There was a positive correlation between MMP-2 and TIMP-2 (r=0.399, p
AB - Background: Circulating metalloproteinases (MMP) and their inhibitors (TIMP) are indices of vascular and cardiac tissue matrix turnover. However, the temporal changes and relationship of these parameters to age, gender, ethnicity and exercise have been poorly defined, even in healthy individuals. We therefore studied these aspects on plasma levels of MMP-2 and -9 and TIMP-1 and -2, as the major metalloproteinases (and their inhibitors) implicated in pathophysiology of vascular disease. Methods: Venous citrated blood was collected from 93 normal healthy volunteers from four ethnic groups (Afro-Caribbean, South Asian, Caucasian and Far Eastern) for a cross-sectional study. In addition, 20 separate healthy volunteers were studied during supine rest, before and immediately following peak treadmill stress using a Bruce protocol. MMP-2 and -9 and TIMP-1 and -2 were all measured by ELISA. Results: There was a categorical distribution of MMP-2 concentration with individual subjects showing high levels, yet others being undetectable, although these changes were unrelated to age, gender or ethnicity. TIMP-1 and -2 showed a modest negative correlation with age (r=-0.251, p=0.015; r=-0.254, p=0.014). There was a positive correlation between MMP-2 and TIMP-2 (r=0.399, p
KW - extracellular matrix
KW - tissue inhibitor of metalloproteinase
KW - matrix metalloproteinases
KW - age
KW - gender
KW - exercise
KW - diurnal variation
KW - ethnicity
U2 - 10.1016/j.thromres.2004.08.023
DO - 10.1016/j.thromres.2004.08.023
M3 - Article
C2 - 15617743
SN - 0049-3848
VL - 115
SP - 205
EP - 210
JO - Thrombosis Research
JF - Thrombosis Research
IS - 3
ER -