TY - JOUR
T1 - Collagen structure and nonlinear susceptibility
T2 - Effects of heat, glycation, and enzymatic cleavage on second harmonic signal intensity
AU - Kim, Beop Min
AU - Eichler, Jürgen
AU - Reiser, Karen M.
AU - Rubenchik, Alexander M.
AU - Da Silva, Luiz B.
PY - 2000
Y1 - 2000
N2 - Background and Objective: Helical macromolecules such as collagen and DNA are characterized by nonlinear optical properties, including nonlinear susceptibility. Because collagen is the predominant component of most biological tissues, as well as the major source of second harmonic generation (SHG), it is reasonable to assume that changes in harmonic signal can be attributed to structural changes in collagen. The purpose of this study is to determine whether various modifications of collagen structure affect second harmonic intensity. Study Design/Materials and Methods: SHG was measured in tissues from cows, humans, and chickens. The effects of beam polarization, thermal denaturation, glyco-oxidative damage, and enzymatic cleavage of tissues on second harmonic intensity was studied. Results: The second harmonic intensity differed considerably among different tissues, as did the effect of the incident beam polarization. In structurally modified collagen, SHG was significantly degraded from SHG in intact collagen. Conclusion: These structural modifications are representative of changes that occur in pathophysiologic conditions such as thermal injury, diabetes, tumor invasion, and abnormal wound healing. The ability to assess these changes rapidly and noninvasively has considerable clinical applicability. SHG analysis might provide a unique tool for monitoring these structural changes of collagen.
AB - Background and Objective: Helical macromolecules such as collagen and DNA are characterized by nonlinear optical properties, including nonlinear susceptibility. Because collagen is the predominant component of most biological tissues, as well as the major source of second harmonic generation (SHG), it is reasonable to assume that changes in harmonic signal can be attributed to structural changes in collagen. The purpose of this study is to determine whether various modifications of collagen structure affect second harmonic intensity. Study Design/Materials and Methods: SHG was measured in tissues from cows, humans, and chickens. The effects of beam polarization, thermal denaturation, glyco-oxidative damage, and enzymatic cleavage of tissues on second harmonic intensity was studied. Results: The second harmonic intensity differed considerably among different tissues, as did the effect of the incident beam polarization. In structurally modified collagen, SHG was significantly degraded from SHG in intact collagen. Conclusion: These structural modifications are representative of changes that occur in pathophysiologic conditions such as thermal injury, diabetes, tumor invasion, and abnormal wound healing. The ability to assess these changes rapidly and noninvasively has considerable clinical applicability. SHG analysis might provide a unique tool for monitoring these structural changes of collagen.
KW - Polarization
KW - Second harmonic generation
KW - Ultrashort pulse laser
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U2 - 10.1002/1096-9101(2000)27:4<329::AID-LSM5>3.0.CO;2-C
DO - 10.1002/1096-9101(2000)27:4<329::AID-LSM5>3.0.CO;2-C
M3 - Article
C2 - 11074509
AN - SCOPUS:0033787215
VL - 27
SP - 329
EP - 335
JO - Lasers in Surgery and Medicine
JF - Lasers in Surgery and Medicine
SN - 0196-8092
IS - 4
ER -