Abstract

We propose to evaluate two-photon microscopy of BPD-MA to study subcellular localization under a variety of conditions. Benzoporphyrin Derivative is a second-generation photosensitizing compound currently undergoing phase II clinical trials for use in treating psoriasis, age-related macular degeneration as well as cutaneous oncology. Previous research has demonstrated that this drug is a potent sensitizer, with efficacy in cell killing demonstrated at concentrations below 200 ng/ml. Its primary subcellular target is believed to the mitochondria, where it has been demonstrated that BPD-MA can photodynamically uncouple oxidative phosphorylation in the isolated rat mitochondria. Our initial experiments have sought to optimize two-photon microscopy for observation of this drug. The two-photon cross section of BPD-MA in a liposomal preparation has recently been measured from 820-980 nm. Having measured the cross section, we will be able to evaluate a detection threshold that will then be ve rified in adherent cell culture. Organelle localization studies have been outlined are expected to proceed in the near future.

  Funding Agency

Agency
National Institute of Health (NIH)
Institute
National Center for Research Resources (NCRR)
Type
Biotechnology Resource Grants (P41)
Project #
5P41RR004224-12
Application #
6206173
Study Section
Project Start
1999-09-01
Project End
2000-08-31
Budget Start
1998-10-01
Budget End
1999-09-30
Support Year
12
Fiscal Year
1999
Total Cost
Indirect Cost

  Institution

Name
Cornell University
Department
Type
DUNS #
City
Ithaca
State
NY
Country
United States
Zip Code
14850

  Publications

Migone, Fernando F; Cowan, Robert G; Williams, Rebecca M et al. (2016) In vivo imaging reveals an essential role of vasoconstriction in rupture of the ovarian follicle at ovulation. Proc Natl Acad Sci U S A 113:2294-9
O'Dell, Ryan S; Cameron, David A; Zipfel, Warren R et al. (2015) Reelin Prevents Apical Neurite Retraction during Terminal Translocation and Dendrite Initiation. J Neurosci 35:10659-74
Byrnes, Laura J; Singh, Avtar; Szeto, Kylan et al. (2013) Structural basis for conformational switching and GTP loading of the large G protein atlastin. EMBO J 32:369-84
Jain, Manu; Robinson, Brian D; Scherr, Douglas S et al. (2012) Multiphoton microscopy in the evaluation of human bladder biopsies. Arch Pathol Lab Med 136:517-26
Degala, Satish; Williams, Rebecca; Zipfel, Warren et al. (2012) Calcium signaling in response to fluid flow by chondrocytes in 3D alginate culture. J Orthop Res 30:793-9
O'Dell, Ryan S; Ustine, Candida J M; Cameron, David A et al. (2012) Layer 6 cortical neurons require Reelin-Dab1 signaling for cellular orientation, Golgi deployment, and directed neurite growth into the marginal zone. Neural Dev 7:25
McMullen, J D; Kwan, A C; Williams, R M et al. (2011) Enhancing collection efficiency in large field of view multiphoton microscopy. J Microsc 241:119-24
Kim, Sally A; Sanabria, Hugo; Digman, Michelle A et al. (2010) Quantifying translational mobility in neurons: comparison between current optical techniques. J Neurosci 30:16409-16
Bowles, Robby D; Williams, Rebecca M; Zipfel, Warren R et al. (2010) Self-assembly of aligned tissue-engineered annulus fibrosus and intervertebral disc composite via collagen gel contraction. Tissue Eng Part A 16:1339-48
McMullen, Jesse D; Zipfel, Warren R (2010) A multiphoton objective design with incorporated beam splitter for enhanced fluorescence collection. Opt Express 18:5390-8

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