25 research outputs found
CXCL12-Mediated Guidance of Migrating Embryonic Stem Cell-Derived Neural Progenitors Transplanted into the Hippocampus
Stem cell therapies for neurodegenerative disorders require accurate delivery of the transplanted cells to the sites of damage. Numerous studies have established that fluid injections to the hippocampus can induce lesions in the dentate gyrus (DG) that lead to cell death within the upper blade. Using a mouse model of temporal lobe epilepsy, we previously observed that embryonic stem cell-derived neural progenitors (ESNPs) survive and differentiate within the granule cell layer after stereotaxic delivery to the DG, replacing the endogenous cells of the upper blade. To investigate the mechanisms for ESNP migration and repair in the DG, we examined the role of the chemokine CXCL12 in mice subjected to kainic acid-induced seizures. We now show that ESNPs transplanted into the DG show extensive migration through the upper blade, along the septotemporal axis of the hippocampus. Seizures upregulate CXCL12 and infusion of the CXCR4 antagonist AMD3100 by osmotic minipump attenuated ESNP migration. We also demonstrate that seizures promote the differentiation of transplanted ESNPs toward neuronal rather than astrocyte fates. These findings suggest that ESNPs transplanted into the adult rodent hippocampus migrate in response to cytokine-mediated signals
Technical Report - Retrospective analysis of role of interstitial brachytherapy using template (MUPIT) in locally advanced gynecological malignancies
Aim : The aim of this retrospective study was to assess treatment
outcomes for patients with locally advanced gynecological malignancies
being treated with interstitial brachytherapy using Martinez universal
perineal interstitial template (MUPIT) and to study the acute and late
sequelae and survival after treatment by this technique. Materials and
Methods : Ninety seven patients untreated with histopathological
confirmation of carcinoma of cervix (37) vault (40) and vagina (20)
were treated by combination of external beam RT (EBRT) using
megavoltage irradiation to pelvis to dose of 4000-5000 cGy followed by
interstitial brachytherapy using MUPIT between September 2001 to March
2005. Median age was 46 years. Only those patients who were found
unsuitable for conventional brachytherapy or in whom intracavitatory
radiotherapy was found to be unlikely to encompass a proper dose
distribution were treated by interstitial template brachytherapy using
MUPIT application and were enrolled in this study. The dose of MUPIT
was 1600-2400 cGy in 4-6# with 400 cGy /# and two fractions a day with
minimum gap of six hours in between two fractions on micro-HDR.
Criteria for inclusion of patients were as follows: Hb minimum 10
gm/dl, performance status - 70% or more (Karnofsy scale),
histopathological confirmation FIGO stage IIB-IIIB (excluding frozen
pelvis). Results : Among the 97 patients studied, 12 patients lost to
follow-up and hence they were excluded from the study. Follow-up of
rest of the patients was then done up to September 2006. The duration
of follow-up was in the range of 20-60 months. Parameters studied were
local control rate, complication rate, mortality rate and number of
patients developing systemic metastasis. Local control was achieved in
56/85 (64.7%) and complication rate was 15/85 (17.6%). Local control
was better for nonbulky tumors compared bulky tumors irrespective of
stage of disease. Local control was better in patients with good
regression of disease after external beam radiotherapy. Time of gap
between EBRT and implant also had an impact on the outcome. Conclusion
: Interstitial template brachytherapy by MUPIT is a good alternative to
deliver high dose radiation in locally advanced gynecological
malignancies where conventional brachytherapy application is either not
feasible or likely to give optimal dose distribution. Loco regional
control obtained is definitely better than EBRT alone and within the
accepted range of complications
Technical Report - Retrospective analysis of role of interstitial brachytherapy using template (MUPIT) in locally advanced gynecological malignancies
Aim : The aim of this retrospective study was to assess treatment
outcomes for patients with locally advanced gynecological malignancies
being treated with interstitial brachytherapy using Martinez universal
perineal interstitial template (MUPIT) and to study the acute and late
sequelae and survival after treatment by this technique. Materials and
Methods : Ninety seven patients untreated with histopathological
confirmation of carcinoma of cervix (37) vault (40) and vagina (20)
were treated by combination of external beam RT (EBRT) using
megavoltage irradiation to pelvis to dose of 4000-5000 cGy followed by
interstitial brachytherapy using MUPIT between September 2001 to March
2005. Median age was 46 years. Only those patients who were found
unsuitable for conventional brachytherapy or in whom intracavitatory
radiotherapy was found to be unlikely to encompass a proper dose
distribution were treated by interstitial template brachytherapy using
MUPIT application and were enrolled in this study. The dose of MUPIT
was 1600-2400 cGy in 4-6# with 400 cGy /# and two fractions a day with
minimum gap of six hours in between two fractions on micro-HDR.
Criteria for inclusion of patients were as follows: Hb minimum 10
gm/dl, performance status - 70% or more (Karnofsy scale),
histopathological confirmation FIGO stage IIB-IIIB (excluding frozen
pelvis). Results : Among the 97 patients studied, 12 patients lost to
follow-up and hence they were excluded from the study. Follow-up of
rest of the patients was then done up to September 2006. The duration
of follow-up was in the range of 20-60 months. Parameters studied were
local control rate, complication rate, mortality rate and number of
patients developing systemic metastasis. Local control was achieved in
56/85 (64.7%) and complication rate was 15/85 (17.6%). Local control
was better for nonbulky tumors compared bulky tumors irrespective of
stage of disease. Local control was better in patients with good
regression of disease after external beam radiotherapy. Time of gap
between EBRT and implant also had an impact on the outcome. Conclusion
: Interstitial template brachytherapy by MUPIT is a good alternative to
deliver high dose radiation in locally advanced gynecological
malignancies where conventional brachytherapy application is either not
feasible or likely to give optimal dose distribution. Loco regional
control obtained is definitely better than EBRT alone and within the
accepted range of complications