東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

Regulation of fibroblast function in...

Tran, Kien T.

Linked to FindBook

Google Book

Amazon

博客來

Regulation of fibroblast function in wound repair.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Regulation of fibroblast function in wound repair./
Author:	Tran, Kien T.
Description:	136 p.
Notes:	Source: Dissertation Abstracts International, Volume: 64-07, Section: B, page: 3045.
Contained By:	Dissertation Abstracts International64-07B.
Subject:	Biology, Cell. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3097648

Regulation of fibroblast function in wound repair.
Tran, Kien T.

Regulation of fibroblast function in wound repair. - 136 p.

Source: Dissertation Abstracts International, Volume: 64-07, Section: B, page: 3045.

Thesis (Ph.D.)--University of Pittsburgh, 2003.

Wound healing is a complex, orchestrated process required for the maintenance of developing and adult organisms. Aberrant, delayed, or unsuccessful wound healing contributes to a high percentage of mortality and morbidity within our society. For wound repair to be successful, the recruitment, proliferation, and retention of fibroblasts are required. Dermal fibroblasts within the disturbed locale contribute to extracellular matrix degradation, remodeling, and ultimate contraction of the wound. Signaling via the EGFR plays an important role in migration and proliferation of fibroblasts and epithelial cells during wound healing. Unfortunately, current understanding of control mechanisms for fibroblast motility into the wound bed via the extracellular matrix and ultimate proliferation is not complete. Further, knowledge of cell signaling regulation during fibroblast aging is nascent. This work, herein, describes investigations into the Epidermal Growth Factor Receptor (EGFR) signaling cascade of fibroblasts as it relates to the EGF-like repeats of the extracellular matrix protein, tenascin-C, and the EGFR cascade as it pertains to senescence-associated alterations. Tenascin-C is unique in that its expression is temporally and spatially restricted and tied to moments requiring mitogenesis and motility. Within each arm of the hexameric macro-protein are 14.5 EGF-like repeats of obscure function. This work describes the first definitive proof that ECM proteins can signal directly to growth factor receptors as ligands, suggesting a novel mode of signaling from the ECM directing cell motility via "matrikines." Utilizing the extremely low affinity EGF-like repeats, we were able to test basic hypothesese related to cell signal partitioning. We were able to show that signal promotion restricted mainly to the cell surface as opposed to the endosome was preferential for cell migration as compared to proliferation. Within the geriatric population, a mounting deficiency in wound healing leads to increased complications and death. The causes for this aging-associated decrement in wound healing are obscure. As fibroblasts approach senescence, their migratory and proliferative capacities diminish, suggesting one root cause of aging-associated incompetence. This diminishment is tied to a decrement in EGFR levels and signaling at the level of the receptor. We investigated the causes of this EGFR signaling deficiency. Our final work describes an elevated protein tyrosine phosphatase mechanism attenuating EGFR signaling within aged cells, with eventual increases in levels of Shp-1 and PTP1B. This work, in its entirety, supports a wound healing model in which ECM components like tenascin-C are laid down and signal through growth factor receptors to initiate migration preferentially from the cell surface compartment. It further supports the notion that during senescence EGFR is attenuated by enhanced PTP activity to blunt the migratory and proliferative signals during wound healing.Subjects--Topical Terms:

1017686
Biology, Cell.

Regulation of fibroblast function in wound repair.
LDR:03900nmm 2200301 4500 001 1860784
005 20041108070324.5
008 130614s2003 eng d
035 $a (UnM)AAI3097648
035 $a AAI3097648
040 $a UnM $c UnM
100 1 $a Tran, Kien T. $3 1948412
245 1 0 $a Regulation of fibroblast function in wound repair.
300 $a 136 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-07, Section: B, page: 3045.
500 $a Adviser: Alan Wells.
502 $a Thesis (Ph.D.)--University of Pittsburgh, 2003.
520 $a Wound healing is a complex, orchestrated process required for the maintenance of developing and adult organisms. Aberrant, delayed, or unsuccessful wound healing contributes to a high percentage of mortality and morbidity within our society. For wound repair to be successful, the recruitment, proliferation, and retention of fibroblasts are required. Dermal fibroblasts within the disturbed locale contribute to extracellular matrix degradation, remodeling, and ultimate contraction of the wound. Signaling via the EGFR plays an important role in migration and proliferation of fibroblasts and epithelial cells during wound healing. Unfortunately, current understanding of control mechanisms for fibroblast motility into the wound bed via the extracellular matrix and ultimate proliferation is not complete. Further, knowledge of cell signaling regulation during fibroblast aging is nascent. This work, herein, describes investigations into the Epidermal Growth Factor Receptor (EGFR) signaling cascade of fibroblasts as it relates to the EGF-like repeats of the extracellular matrix protein, tenascin-C, and the EGFR cascade as it pertains to senescence-associated alterations. Tenascin-C is unique in that its expression is temporally and spatially restricted and tied to moments requiring mitogenesis and motility. Within each arm of the hexameric macro-protein are 14.5 EGF-like repeats of obscure function. This work describes the first definitive proof that ECM proteins can signal directly to growth factor receptors as ligands, suggesting a novel mode of signaling from the ECM directing cell motility via "matrikines." Utilizing the extremely low affinity EGF-like repeats, we were able to test basic hypothesese related to cell signal partitioning. We were able to show that signal promotion restricted mainly to the cell surface as opposed to the endosome was preferential for cell migration as compared to proliferation. Within the geriatric population, a mounting deficiency in wound healing leads to increased complications and death. The causes for this aging-associated decrement in wound healing are obscure. As fibroblasts approach senescence, their migratory and proliferative capacities diminish, suggesting one root cause of aging-associated incompetence. This diminishment is tied to a decrement in EGFR levels and signaling at the level of the receptor. We investigated the causes of this EGFR signaling deficiency. Our final work describes an elevated protein tyrosine phosphatase mechanism attenuating EGFR signaling within aged cells, with eventual increases in levels of Shp-1 and PTP1B. This work, in its entirety, supports a wound healing model in which ECM components like tenascin-C are laid down and signal through growth factor receptors to initiate migration preferentially from the cell surface compartment. It further supports the notion that during senescence EGFR is attenuated by enhanced PTP activity to blunt the migratory and proliferative signals during wound healing.
590 $a School code: 0178.
650 4 $a Biology, Cell. $3 1017686
650 4 $a Health Sciences, Medicine and Surgery. $3 1017756
650 4 $a Health Sciences, Pathology. $3 1017854
650 4 $a Health Sciences, Pharmacy. $3 1017737
650 4 $a Biology, Molecular. $3 1017719
690 $a 0379
690 $a 0564
690 $a 0571
690 $a 0572
690 $a 0307
710 2 0 $a University of Pittsburgh. $3 958527
773 0 $t Dissertation Abstracts International $g 64-07B.
790 1 0 $a Wells, Alan, $e advisor
790 $a 0178
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3097648